[Federal Register: July 17, 2009 (Volume 74, Number 136)][Notices] [Page 34789-34795]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr17jy09-106]
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DEPARTMENT OF LABOR
Occupational Safety and Health Administration
[Docket No. OSHA-2007-0046]
Calaveras Power Partners L.P., Matrix Service Inc., T.E. Ibberson
Company, TIC--The Industrial Company, and Zachry Construction
Corporation; Grant of a Permanent Variance
AGENCY: Occupational Safety and Health Administration (OSHA),
Department of Labor.
ACTION: Notice of a grant of a permanent variance.
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SUMMARY: This notice announces the grant of a permanent variance to
Calaveras Power Partners L.P., Matrix Service Inc., T.E. Ibberson
Company, TIC--The Industrial Company, and Zachry Construction
Corporation ("the employers"). The permanent variance addresses the
provision that regulates the tackle used for boatswain's chairs (29 CFR
1926.452(o)(3)), as well as the provisions specified for personnel
hoists by paragraphs (c)(1) through (c)(4), (c)(8), (c)(13),
(c)(14)(i), and (c)(16) of 29 CFR 1926.552. As an alternative to
complying with these provisions, the employers may instead comply with
the conditions listed in this grant; these alternative conditions
regulate hoisting systems used during inside or outside chimney
construction to raise or lower workers in personnel cages, personnel
platforms, and boatswain's chairs between the bottom landing of a
chimney and an elevated work location. Accordingly, OSHA finds that
these alternative conditions protect workers at least as well as the
requirements specified by 29 CFR 1926.452(o)(3) and 1926.552(c)(1)
through (c)(4), (c)(8), (c)(13), (c)(14)(i), and (c)(16).
DATES: The effective date of the permanent variance is July 17, 2009.
FOR FURTHER INFORMATION CONTACT: For information about this notice
contact Ms. MaryAnn Garrahan, Director, Office of Technical Programs
and Coordination Activities, Room N-3655, OSHA, U.S. Department of
Labor, 200 Constitution Avenue, NW., Washington, DC 20210; telephone
(202) 693-2110; fax (202) 693-1644. Electronic copies of this notice
are available at http://www.regulations.gov. Electronic copies of this
notice, as well as news releases and other relevant information, are
available on OSHA's Web page at http://www.osha.gov.
Additional information also is available from the following OSHA
Regional Offices:
U.S. Department of Labor, OSHA, JFK Federal Building, Room E340,
Boston, MA 02203; telephone: (617) 565-9860; fax: (617) 565-9827.
U.S. Department of Labor, OSHA, 201 Varick Street, Room 670, New York,
NY 10014; telephone: (212) 337-2378; fax: (212) 337-2371.
U.S. Department of Labor, OSHA, the Curtis Center, Suite 740 West, 170
South Independence Mall West, Philadelphia, PA 19106-3309; telephone:
(215) 861-4900; fax: (215) 861-4904.
U.S. Department of Labor, OSHA, Atlanta Federal Center, 61 Forsyth
Street, SW., Room 6T50, Atlanta, GA 30303; telephone: (404) 562-2300;
fax: (404) 562-2295.
U.S. Department of Labor, OSHA, 230 South Dearborn Street, Room 3244,
Chicago, IL 60604; telephone: (312) 353-2220; fax: (312) 353-7774.
U.S. Department of Labor, OSHA, Two Pershing Square Building, 2300 Main
Street, Suite 1010, Kansas City, MO 64108-2416; telephone: (816) 283-
8745; fax: (816) 283-0547.
U.S. Department of Labor, OSHA, 525 Griffin Street, Suite 602, Dallas,
TX 75202; telephone: (972) 850-4145; fax: (972) 850-4149.
U.S. Department of Labor, OSHA, 1999 Broadway, Suite 1690, Denver, CO
80202; telephone: (720) 264-6550; fax: (720) 264-6585.
U.S. Department of Labor, OSHA, 90 7th Street, Suite 18100, San
Francisco, CA 94103; telephone: (415) 625-2547; fax: (415) 625-2534.
U.S. Department of Labor, OSHA, 1111 Third Avenue, Suite 715, Seattle,
WA 98101-3212; telephone: (206) 553-5930; fax: (206) 553-6499.
SUPPLEMENTARY INFORMATION:
I. Background
In the past 35 years, a number of chimney-construction companies
have demonstrated to OSHA that several personnel-hoist requirements
(i.e., paragraphs (c)(1), (c)(2), (c)(3), (c)(4), (c)(8), (c)(13),
(c)(14)(i), and (c)(16) of 29 CFR 1926.552), as well as the tackle
requirements for boatswain's chairs (i.e., paragraph (o)(3) of 29 CFR
1926.452), result in access problems that pose a serious danger to
their workers. These companies requested permanent variances from these
requirements, and proposed alternative equipment and procedures to protect
workers while being transported to and from their elevated worksites during
chimney construction and repair. The Agency subsequently granted these
companies permanent variances based on the proposed alternatives
(see 38 FR 8545 (April 3, 1973), 44 FR 51352 (August 31, 1979), 50 FR 20145
(May 14, 1985), 50 FR 40627 (October 4, 1985), 52 FR 22552 (June 12, 1987),
68 FR 52961 (September 8, 2003), 70 FR 72659 (December 6, 2005), and 71 FR
10557 (March 1, 2006)).\1\
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\1\ Zurn Industries, Inc. received two permanent variances from
OSHA. The first variance, granted on May 14, 1985 (50 FR 20145),
addressed the boatswain's-chair provision (then in paragraph (l)(5)
of 29 CFR 1926.451), as well as the hoist-platform requirements of
paragraphs (c)(1), (c)(2), (c)(3), and (c)(14)(i) of 29 CFR
1926.552. The second variance, granted on June 12, 1987 (52 FR
22552), includes these same paragraphs, as well as paragraphs
(c)(4), (c)(8), (c)(13), and (c)(16) of 29 CFR 1926.552.
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Calaveras Power Partners L.P., Matrix Service Inc., T.E. Ibberson
Company, TIC--The Industrial Company and Zachry Construction
Corporation applied for a permanent variance from the same personnel-
hoist and boatswain's-chair requirements as the previous companies, and
proposed as an alternative to these requirements the same equipment and
procedures approved by OSHA in the earlier variances (see Exhibits
OSHA-2007-0046-0002 through -0006). The Agency published their variance
applications in the Federal Register on January 23, 2009 (74 FR 4237).
Calaveras Power Partners L.P., Matrix Service Inc., T.E. Ibberson
Company, TIC--The Industrial Company and Zachry Construction
Corporation ("the employers") construct, remodel, repair, maintain,
inspect, and demolish tall chimneys made of reinforced concrete, brick,
and steel. This work, which occurs throughout the United States,
requires the employers to transport workers and construction material
to and from elevated work platforms and scaffolds located,
respectively, inside and outside tapered chimneys. While tapering
contributes to the stability of a chimney, it necessitates frequent
relocation of, and adjustments to, the work platforms and scaffolds so
these structures will fit the decreasing circumference of the chimney
as construction progresses upwards.
To transport workers to various heights inside and outside a
chimney, the employers proposed in their variance application to use a
hoist system that lifts and lowers personnel-transport devices that
include personnel cages, personnel platforms, or boatswain's chairs. In
this regard, the employers proposed to use personnel cages, personnel
platforms, or boatswain's chairs solely to transport workers with the
tools and materials necessary to do their work, and not to transport
only materials or tools on these devices in the absence of workers. In
addition, the employers proposed to attach a hopper or concrete bucket
to the hoist system to raise or lower material inside or outside a
chimney.
The employers also proposed to use a hoist engine, located and
controlled outside the chimney, to power the hoist system. The proposed
system consisted of a wire rope that: Spools off a winding drum (also
known as the hoist drum or rope drum) into the interior of the chimney;
passes to a footblock that redirects the rope from the horizontal to
the vertical planes; goes from the footblock through the overhead
sheaves above the elevated platform; and finally drops to the bottom
landing of the chimney where it connects to a personnel- or material-
transport device. A cathead, which is a superstructure at the top of
the system, supports the overhead sheaves. The overhead sheaves (and
the vertical span of the hoist system) move upward with the system as
chimney construction progresses. Two guide cables, suspended from the
cathead, eliminate swaying and rotation of the load. If the hoist rope
breaks, safety clamps activate and grip the guide cables to prevent the
load from falling. The employers proposed to use a headache ball,
located on the hoist rope directly above the load, to counterbalance
the rope's weight between the cathead sheaves and the footblock.
Additional conditions that the employers proposed to follow to
improve worker safety included:
Attaching the wire rope to the personnel cage using a
keyed-screwpin shackle or positive-locking link;
Adding limit switches to the hoist system to prevent
overtravel by the personnel- or material-transport devices;
Providing the safety factors and other precautions
required for personnel hoists specified by the pertinent provisions of
29 CFR 1926.552(c), including canopies and shields to protect workers
located in a personnel cage from material that may fall during hoisting
and other overhead activities;
Providing falling-object protection for scaffold platforms
as specified by 29 CFR 1926.451(h)(1);
Conducting tests and inspections of the hoist system as
required by 29 CFR 1926.20(b)(2) and 1926.552(c)(15);
Establishing an accident-prevention program that conforms
to 29 CFR 1926.20(b)(3);
Equipping workers who use a personnel cage, personnel
platform, or boatswain's chair with, and ensuring that they use,
personal fall-arrest systems meeting the requirements of 29 CFR
1926.502(d);
Ensuring that workers using a personnel cage secure their
personal fall-arrest system to an attachment point located inside the
cage, and that workers using personnel platforms or boatswain's chairs
secure their personal fall-arrest systems to a vertical lifeline;
When using vertical lifelines, securing the lifelines to
the top of the chimney and weighting the lifelines properly or suitably
affixing the lifelines to the bottom of the chimney, and ensuring that
workers remain attached to their lifeline during the entire period of
vertical transit;
Providing instruction to each worker who uses a personnel
platform or boatswain's chair regarding the shearing and struck-by
hazards posed by the hoist system (e.g., work platforms, scaffolds),
and the need to keep their limbs or other body parts clear of these
hazards during hoisting operations;
Providing the instruction on shearing and struck-by
hazards before a worker uses one of these personnel-transport devices
at the worksite; and periodically, and as necessary, thereafter,
including whenever the worker demonstrates: A lack of knowledge about
the hazard or how to avoid it, a modification occurs to an existing
shearing hazard, or a new shearing hazard develops at the worksite;
Attaching a readily visible warning to each personnel
platform and boatswain's chair notifying workers in a language they
understand of potential shearing hazards during hoisting operations;
for warnings located on personnel platforms, using the following (or
equivalent) wording: "Warning--To avoid serious injury, keep your
hands, arms, feet, legs, and other parts of your body inside this
platform while it is in motion"; and for boatswain's chairs, the
warning uses the following (or equivalent) wording: "Warning--To avoid
serious injury, do not extend your hands, arms, feet, legs, or other
parts of your body from the side or to the front of this chair while it
is in motion"; and
Establishing a clearly designated safety zone around the
hoist system's bottom landing and prohibiting any worker from entering
the safety zone except to access a personnel cage, personnel platform,
boatswain's chair, or material-transport device, and then only when the
personnel- and material-transport device is at the bottom landing and
not in operation.
II. Proposed Variance From 29 CFR 1926.452(o)(3)
The employers noted in their variance request that it is necessary,
on occasion, to use a boatswain's chair to transport workers to and
from a bracket scaffold on the outside of an existing chimney during
flue installation or repair work, or to transport them to and from an
elevated scaffold located inside a chimney that has a small or tapering
diameter. Paragraph (o)(3) of 29 CFR 1926.452, which regulates the
tackle used to rig a boatswain's chair, states that this tackle must
"consist of correct size ball bearings or bushed blocks containing
safety hooks and properly `eye-spliced' minimum five-eighth (\5/8\)
inch diameter first-grade manila rope [or equivalent rope]."
The primary purpose of this paragraph is to allow a worker to
safely control the ascent, descent, and stopping locations of the
boatswain's chair. However, the employers stated in their variance
request that, because of space limitations, the required tackle is
difficult or impossible to operate on some chimneys that are over 200
feet tall. Therefore, as an alternative to complying with the tackle
requirements specified by 29 CFR 1926.452(o)(3), the employers proposed
to use the hoisting system described above in section I
("Background") of this notice to raise or lower workers in a
personnel cage to work locations both inside and outside a chimney. In
addition, the employers proposed to use a personnel cage for this
purpose to the extent that adequate space is available, and to use a
personnel platform only when using a personnel cage was infeasible
because of limited space. When available space makes using a personnel
platform infeasible, the employers proposed to use a boatswain's chair
to lift workers to work locations. The proposed variance limited use of
the boatswain's chair to elevations above the last work location that
the personnel platform can reach; under these conditions, the employers
proposed to attach the boatswain's chair directly to the hoisting cable
only when the structural arrangement precludes the safe use of the
block and tackle required by 29 CFR 1926.452(o)(3).
III. Proposed Variance From 29 CFR 1926.552(c)
Paragraph (c) of 29 CFR 1926.552 specifies the requirements for
enclosed hoisting systems used to transport workers from one elevation
to another. This paragraph ensures that employers transport workers
safely to and from elevated work platforms by mechanical means during
the construction, alteration, repair, maintenance, or demolition of
structures such as chimneys. However, this standard does not provide
specific safety requirements for hoisting workers to and from elevated
work platforms and scaffolds in tapered chimneys; the tapered design
requires frequent relocation of, and adjustment to, the work platforms
and scaffolds. The space in a small-diameter or tapered chimney is not
large enough or configured so that it can accommodate an enclosed hoist
tower. Moreover, using an enclosed hoist tower for outside operations
exposes workers to additional fall hazards because they need to install
extra bridging and bracing to support a walkway between the hoist tower
and the tapered chimney.
Paragraph (c)(1) of 29 CFR 1926.552 requires the employers to
enclose hoist towers located outside a chimney on the side or sides
used for entrance to, and exit from, the chimney; these enclosures must
extend the full height of the hoist tower. The employers asserted in
their proposed variance that it is impractical and hazardous to locate
a hoist tower outside tapered chimneys because it becomes increasingly
difficult, as a chimney rises, to erect, guy, and brace a hoist tower;
under these conditions, access from the hoist tower to the chimney or
to the movable scaffolds used in constructing the chimney exposes
workers to a serious fall hazard. Additionally, they noted that the
requirement to extend the enclosures 10 feet above the outside
scaffolds often exposes the workers involved in building these
extensions to dangerous wind conditions.
Paragraph (c)(2) of 29 CFR 1926.552 requires that employers enclose
all four sides of a hoist tower even when the tower is located inside a
chimney; the enclosure must extend the full height of the tower. In the
proposed variance, the employers contended that it is hazardous for
workers to erect and brace a hoist tower inside a chimney, especially
small-diameter or tapered chimneys or chimneys with sublevels, because
these structures have limited space and cannot accommodate hoist
towers; space limitations result from chimney design (e.g., tapering),
as well as reinforced steel projecting into the chimney from formwork
that is near the work location.
As an alternative to complying with the hoist-tower requirements of
29 CFR 1926.552(c)(1) and (c)(2), the employers proposed to use the
hoist system discussed in section I ("Background") of this notice to
transport workers to and from work locations inside and outside
chimneys. They claimed that this hoist system would make it unnecessary
for them to comply with other provisions of 29 CFR 1926.552(c) that
specify requirements for hoist towers, including:
(c)(3)--Anchoring the hoist tower to a structure;
(c)(4)--Hoistway doors or gates;
(c)(8)--Electrically interlocking entrance doors or gates
that prevent hoist movement when the doors or gates are open;
(c)(13)--Emergency stop switch located in the car;
(c)(14)(i)--Using a minimum of two wire ropes for drum-
type hoisting; and
(c)(16)--Construction specifications for personnel hoists,
including materials assembly, structural integrity, and safety devices.
The employers asserted that the proposed hoisting system protected
workers at least as effectively as the personnel-hoist requirements of
29 CFR 1926.552(c). The following section of this preamble reviews the
comments received on the employers' proposed variance.
IV. Comments on the Proposed Variance
OSHA received no comments on the proposed variance.
V. Decision
Calaveras Power Partners L.P., Matrix Service Inc., T. E. Ibberson
Company, TIC--The Industrial Company, and Zachry Construction
Corporation seek a permanent variance from the provision that regulates
the tackle used for boatswain's chairs (29 CFR 1926.452 (o)(3)), as
well as the provisions specified for personnel hoists by paragraphs
(c)(1) through (c)(4), (c)(8), (c)(13), (c)(14)(i), and (c)(16) of 29
CFR 1926.552.
Paragraph (o)(3) of 29 CFR 1926.452 states that the tackle used for
boatswain's chairs must "consist of correct size ball bearings or
bushed blocks containing safety hooks and properly `eye-spliced'
minimum five-eighth (\5/8\) inch diameter first-grade manila rope [or
equivalent rope]." The primary purpose of this provision is to allow a
worker to safely control the ascent, descent, and stopping locations of
the boatswain's chair. The proposed alternative to these requirements
allows the employer to use a boatswain's chair to lift workers to work
locations inside and outside a chimney when either a personnel cage or
a personnel platform is infeasible. The employers proposed to attach
the boatswain's chair to the hoisting system described as an alternative
to paragraph (c) of 29 CFR 1926.552.
Paragraph (c) of 29 CFR 1926.552 specifies the requirements for
enclosed hoisting systems used to transport personnel from one
elevation to another. This paragraph ensures that employers transport
workers safely to and from elevated work platforms by mechanical means
during construction work involving structures such as chimneys. In this
regard, paragraph (c)(1) of 29 CFR 1926.552 requires employers to
enclose hoist towers located outside a chimney on the side or sides
used for entrance to, and exit from, the structure; these enclosures
must extend the full height of the hoist tower. Under the requirements
of paragraph (c)(2) of 29 CFR 1926.552, employers must enclose all four
sides of a hoist tower located inside a chimney; these enclosures also
must extend the full height of the tower.
As an alternative to complying with the hoist-tower requirements of
29 CFR 1926.552(c)(1) and (c)(2), the employers proposed to use a hoist
system to transport workers to and from elevated work locations inside
and outside chimneys. The proposed hoist system includes a hoist
machine, cage, safety cables, and safety measures such as limit
switches to prevent overrun of the cage at the top and bottom landings,
and safety clamps that grip the safety cables if the main hoist line
fails. To transport workers to and from elevated work locations, the
employers proposed to attach a personnel cage to the hoist system.
However, when they can demonstrate that adequate space is not available
for the cage, they may use a personnel platform above the last worksite
that the cage can reach. Further, when the employers show that space
limitations make it infeasible to use a work platform for transporting
workers, they have proposed to use a boatswain's chair above the last
worksite serviced by the personnel platform. Using the proposed hoist
system as an alternative to the hoist-tower requirements of 29 CFR
1926.552(c)(1) and (c)(2) eliminates the need to comply with the other
provisions of 29 CFR 1926.552(c) that specify requirements for hoist
towers. Accordingly, the employers have requested a permanent variance
from these and related provisions (i.e., paragraphs (c)(3), (c)(4),
(c)(8), (c)(13), (c)(14)(i), and (c)(16)).
Under Section 6(d) of the Occupational Safety and Health Act of
1970 (29 U.S.C. 655), and based on the record discussed above, the
Agency finds that when the employers comply with the conditions of the
following order, the working conditions of their workers will be at
least as safe and healthful as if the employers complied with the
working conditions specified by paragraph (o)(3) of 29 CFR 1926.452,
and paragraphs (c)(1) through (c)(4), (c)(8), (c)(13), (c)(14)(i), and
(c)(16) of 29 CFR 1926.552.
VI. Order
OSHA issues this order authorizing Calaveras Power Partners L.P.,
Matrix Service Inc., T. E. Ibberson Company, TIC--The Industrial
Company, and Zachry Construction Corporation ("the employers") to
comply with the following conditions instead of complying with
paragraph (o)(3) of 29 CFR 1926.452 and paragraphs (c)(1) through
(c)(4), (c)(8), (c)(13), (c)(14)(i), and (c)(16) of 29 CFR 1926.552:
1. Scope of the Permanent Variance
(a) This permanent variance applies only to tapered chimneys when
the employers use a hoist system during inside or outside chimney
construction to raise or lower their workers between the bottom landing
of a chimney and an elevated work location on the inside or outside
surface of the chimney.
(b) When using a hoist system as specified in this permanent
variance, the employers must:
(i) Use the personnel cages, personnel platforms, or boatswain's
chairs raised and lowered by the hoist system solely to transport
workers with the tools and materials necessary to do their work; and
(ii) Attach a hopper or concrete bucket to the hoist system to
raise and lower all other materials and tools inside or outside a
chimney.
(c) Except for the requirements specified by 29 CFR 1926.452(o)(3)
and 1926.552(c)(1) through (c)(4), (c)(8), (c)(13), (c)(14)(i), and
(c)(16), the employers must comply fully with all other applicable
provisions of 29 CFR parts 1910 and 1926.
2. Replacing a Personnel Cage With a Personnel Platform or a
Boatswain's Chair
(a) Personnel platform. When the employers demonstrate that
available space makes a personnel cage for transporting workers
infeasible, they may replace the personnel cage with a personnel
platform when they limit use of the personnel platform to elevations
above the last work location that the personnel cage can reach.
(b) Boatswain's chair. Employers must:
(i) Before using a boatswain's chair, demonstrate that available
space makes it infeasible to use a personnel platform for transporting
workers;
(ii) Limit use of a boatswain's chair to elevations above the last
work location that the personnel platform can reach; and
(iii) Use a boatswain's chair in accordance with block-and-tackle
requirements specified by 29 CFR 1926.452(o)(3), unless they can
demonstrate that the structural arrangement of the chimney precludes
such use.
3. Qualified Competent Person
(a) The employers must:
(i) Provide a qualified competent person, as specified in
paragraphs (f) and (m) of 29 CFR 1926.32, who is responsible for
ensuring that the design, maintenance, and inspection of the hoist
system comply with the conditions of this grant and with the
appropriate requirements of 29 CFR part 1926 ("Safety and Health
Regulations for Construction"); and
(ii) Ensure that the qualified competent person is present at
ground level to assist in an emergency whenever the hoist system is
raising or lowering workers.
(b) The employers must use a qualified competent person to design
and maintain the cathead described under Condition 8 ("Cathead and
Sheave") below.
4. Hoist Machine
(a) Type of hoist. The employers must designate the hoist machine
as a portable personnel hoist.
(b) Raising or lowering a transport. The employers must ensure
that:
(i) The hoist machine includes a base-mounted drum hoist designed
to control line speed; and
(ii) Whenever they raise or lower a personnel or material hoist
(e.g., a personnel cage, personnel platform, boatswain's chair, hopper,
concrete bucket) using the hoist system:
(A) The drive components are engaged continuously when an empty or
occupied transport is being lowered (i.e., no "freewheeling");
(B) The drive system is interconnected, on a continuous basis,
through a torque converter, mechanical coupling, or an equivalent
coupling (e.g., electronic controller, fluid clutches, hydraulic
drives).
(C) The braking mechanism is applied automatically when the
transmission is in the neutral position and a forward-reverse coupling
or shifting transmission is being used; and
(D) No belts are used between the power source and the winding
drum.
(c) Power source. The employers must power the hoist machine by an
air, electric, hydraulic, or internal-combustion drive mechanism.
(d) Constant-pressure control switch. The employers must:
(i) Equip the hoist machine with a hand- or foot-operated constant-
pressure control switch (i.e., a "deadman control switch") that stops
the hoist immediately upon release; and
(ii) Protect the control switch to prevent it from activating if
the hoist machine is struck by a falling or moving object.
(e) Line-speed indicator. The employers must:
(i) Equip the hoist machine with an operating line-speed indicator
maintained in good working order; and
(ii) Ensure that the line-speed indicator is in clear view of the
hoist operator during hoisting operations.
(f) Braking systems. The employers must equip the hoist machine
with two (2) independent braking systems (i.e., one automatic and one
manual) located on the winding side of the clutch or couplings, with
each braking system being capable of stopping and holding 150 percent
of the maximum rated load.
(g) Slack-rope switch. The employers must equip the hoist machine
with a slack-rope switch to prevent rotation of the winding drum under
slack-rope conditions.
(h) Frame. The employers must ensure that the frame of the hoist
machine is a self-supporting, rigid, welded-steel structure, and that
holding brackets for anchor lines and legs for anchor bolts are
integral components of the frame.
(i) Stability. The employers must secure hoist machines in position
to prevent movement, shifting, or dislodgement.
(j) Location. The employers must:
(i) Locate the hoist machine far enough from the footblock to
obtain the correct fleet angle for proper spooling of the cable on the
drum; and
(ii) Ensure that the fleet angle remains between one-half degree
(\1/2\[deg]) and one and one-half degrees (1\1/2\[deg]) for smooth
drums, and between one-half degree (\1/2\[deg]) and two degrees
(2[deg]) for grooved drums, with the lead sheave centered on the
drum.\2\
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\2\ This variance adopts the definition of, and specifications
for, fleet angle from Cranes and Derricks, H. I. Shapiro, et al.
(eds.); New York: McGraw-Hill; 3rd ed., 1999, page 592. Accordingly,
the fleet angle is "[t]he angle the rope leading onto a [winding]
drum makes with the line perpendicular to the drum rotating axis
when the lead rope is making a wrap against the flange."
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(k) Drum and flange diameter. The employers must:
(i) Provide a winding drum for the hoist that is at least 30 times
the diameter of the rope used for hoisting; and
(ii) Ensure that the winding drum has a flange diameter that is at
least one and one-half (1\1/2\) times the winding-drum diameter.
(l) Spooling of the rope. The employers must never spool the rope
closer than two (2) inches (5.1 cm) from the outer edge of the winding-
drum flange.
(m) Electrical system. The employers must ensure that all
electrical equipment is weatherproof.
(n) Limit switches. The employers must equip the hoist system with
limit switches and related equipment that automatically prevent
overtravel of a personnel cage, personnel platform, boatswain's chair,
or material-transport device at the top of the supporting structure and
at the bottom of the hoistway or lowest landing level.
5. Methods of Operation
(a) Employee qualifications and training. The employers must:
(i) Ensure that only trained and experienced workers, who are
knowledgeable of hoist-system operations, control the hoist machine;
and
(ii) Provide instruction, periodically and as necessary, on how to
operate the hoist system, to each worker who uses a personnel cage for
transportation.
(b) Speed limitations. The employers must not operate the hoist at
a speed in excess of:
(i) Two hundred and fifty (250) feet (76.9 m) per minute when a
personnel cage is being used to transport workers;
(ii) One hundred (100) feet (30.5 m) per minute when a personnel
platform or boatswain's chair is being used to transport workers; or
(iii) A line speed that is consistent with the design limitations
of the system when only material is being hoisted.
(c) Communication. The employers must:
(i) Use a voice-mediated intercommunication system to maintain
communication between the hoist operator and the workers located in or
on a moving personnel cage, personnel platform, or boatswain's chair;
(ii) Stop hoisting if, for any reason, the communication system
fails to operate effectively; and
(iii) Resume hoisting only when the site superintendent determines
that it is safe to do so.
6. Hoist Rope
(a) Grade. The employers must use a wire rope for the hoist system
(i.e., "hoist rope") that consists of extra-improved plow steel, an
equivalent grade of non-rotating rope, or a regular lay rope with a
suitable swivel mechanism.
(b) Safety factor. The employers must maintain a safety factor of
at least eight (8) times the safe workload throughout the entire length
of hoist rope.
(c) Size. The employers must use a hoist rope that is at least one-
half (\1/2\) inch (1.3 cm) in diameter.
(d) Inspection, removal, and replacement. The employers must:
(i) Thoroughly inspect the hoist rope before the start of each job
and on completing a new setup;
(ii) Maintain the proper diameter-to-diameter ratios between the
hoist rope and the footblock and the sheave by inspecting the wire rope
regularly (see Conditions 7(c) and 8(d), below); and
(iii) Remove and replace the wire rope with new wire rope when any
of the conditions specified by 29 CFR 1926.552(a)(3) occurs.
(e) Attachments. The employers must attach the rope to a personnel
cage, personnel platform, or boatswain's chair with a keyed-screwpin
shackle or positive-locking link.
(f) Wire-rope fastenings. When the employers use clip fastenings
(e.g., U-bolt wire-rope clips) with wire ropes, they must:
(i) Use Table H-20 of 29 CFR 1926.251 to determine the number and
spacing of clips;
(ii) Use at least three (3) drop-forged clips at each fastening;
(iii) Install the clips with the "U" of the clips on the dead end
of the rope; and
(iv) Space the clips so that the distance between them is six (6)
times the diameter of the rope.
7. Footblock
(a) Type of block. The employers must use a footblock:
(i) Consisting of construction-type blocks of solid single-piece
bail with a safety factor that is at least four (4) times the safe
workload, or an equivalent block with roller bearings;
(ii) Designed for the applied loading, size, and type of wire rope
used for hoisting;
(iii) Designed with a guard that contains the wire rope within the
sheave groove;
(iv) Bolted rigidly to the base; and
(v) Designed and installed so that it turns the moving wire rope to
and from the horizontal or vertical direction as required by the
direction of rope travel.
(b) Directional change. The employers must ensure that the angle of
change in the hoist rope from the horizontal to the vertical direction
at the footblock is approximately 90[deg].
(c) Diameter. The employers must ensure that the line diameter of
the footblock is at least 24 times the diameter of the hoist rope.
8. Cathead and Sheave
(a) Support. The employers must use a cathead (i.e., "overhead
support") that consists of a wide-flange beam, or two (2) steel-
channel sections securely bolted back-to-back to prevent spreading.
(b) Installation. The employers must ensure that:
(i) All sheaves revolve on shafts that rotate on bearings; and
(ii) The bearings are mounted securely to maintain the proper
bearing position at all times.
(c) Rope guides. The employers must provide each sheave with
appropriate rope guides to prevent the hoist rope from leaving the
sheave grooves when the rope vibrates or swings abnormally.
(d) Diameter. The employers must use a sheave with a diameter that
is at least 24 times the diameter of the hoist rope.
9. Guide Ropes
(a) Number and construction. The employers must affix two (2) guide
ropes by swivels to the cathead. The guide ropes must:
(i) Consist of steel safety cables not less than one-half (\1/2\)
inch (1.3 cm) in diameter; and
(ii) Be free of damage or defect at all times.
(b) Guide rope fastening and alignment tension. The employers must
fasten one end of each guide rope securely to the overhead support,
with appropriate tension applied at the foundation.
(c) Height. The employers must rig the guide ropes along the entire
height of the hoist-machine structure.
10. Personnel Cage
(a) Construction. A personnel cage must be of steel-frame
construction and capable of supporting a load that is four (4) times
its maximum rated load capacity. The employers also must ensure that
the personnel cage has:
(i) A top and sides that are permanently enclosed (except for the
entrance and exit);
(ii) A floor securely fastened in place;
(iii) Walls that consist of 14-gauge, one-half (\1/2\) inch (1.3
cm) expanded metal mesh, or an equivalent material;
(iv) Walls that cover the full height of the personnel cage between
the floor and the overhead covering;
(v) A sloped roof constructed of one-eighth (\1/8\) inch (0.3 cm)
aluminum, or an equivalent material;
(vi) Safe handholds (e.g., rope grips--but not rails or hard
protrusions \3\) that accommodate each occupant; and
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\3\ To reduce impact hazards should workers lose their balance
because of cage movement.
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(vii) Attachment points to which workers secure their personal
fall-protection systems.
(b) Overhead weight. A personnel cage must have an overhead weight
(e.g., a headache ball of appropriate weight) to compensate for the
weight of the hoist rope between the cathead and the footblock. In
addition, the employers must:
(i) Ensure that the overhead weight is capable of preventing line
run; and
(ii) Use a means to restrain the movement of the overhead weight so
that the weight does not interfere with safe personnel hoisting.
(c) Gate. The personnel cage must have a gate that:
(i) Guards the full height of the entrance opening; and
(ii) Has a functioning mechanical lock that prevents accidental
opening.
(d) Operating procedures. The employers must post the procedures
for operating the personnel cage conspicuously at the hoist operator's
station.
(e) Capacity. The employers must:
(i) Hoist no more than four (4) occupants in the cage at any one
time; and
(ii) Ensure that the rated load capacity of the cage is at least
250 pounds (113.4 kg) for each occupant so hoisted.
(f) Worker notification. The employers must post a sign in each
personnel cage notifying workers of the following conditions:
(i) The standard rated load, as determined by the initial static
drop test specified by Condition 10(g) ("Static drop tests") below;
and
(ii) The reduced rated load for the specific job.
(g) Static drop tests. The employers must:
(i) Conduct static drop tests of each personnel cage that comply
with the definition of "static drop test" specified by section 3
("Definitions") and the static drop-test procedures provided in
section 13 ("Inspections and Tests") of American National Standards
Institute (ANSI) standard A10.22-1990 (R1998) ("American National
Standard for Rope-Guided and Non-guided Worker's Hoists--Safety
Requirements");
(ii) Perform the initial static drop test at 125 percent of the
maximum rated load of the personnel cage, and subsequent drop tests at
no less than 100 percent of its maximum rated load; and
(iii) Use a personnel cage for raising or lowering workers only
when no damage occurred to the components of the cage as a result of
the static drop tests.
11. Safety Clamps
(a) Fit to the guide ropes. The employers must:
(i) Fit appropriately designed and constructed safety clamps to the
guide ropes; and
(ii) Ensure that the safety clamps do not damage the guide ropes
when in use.
(b) Attach to the personnel cage. The employers must attach safety
clamps to each personnel cage for gripping the guide ropes.
(c) Operation. The safety clamps attached to the personnel cage
must:
(i) Operate on the "broken rope principle" defined in section 3
("Definitions") of ANSI standard A10.22-1990 (R1998);
(ii) Be capable of stopping and holding a personnel cage that is
carrying 100 percent of its maximum rated load and traveling at its
maximum allowable speed if the hoist rope breaks at the footblock; and
(iii) Use a pre-determined and pre-set clamping force (i.e., the
"spring compression force") for each hoist system.
(d) Maintenance. The employers must keep the safety-clamp
assemblies clean and functional at all times.
12. Overhead Protection
(a) The employers must install a canopy or shield over the top of
the personnel cage that is made of steel plate at least three-
sixteenths (\3/16\) of an inch (4.763 mm) thick, or material of
equivalent strength and impact resistance to protect workers (i.e.,
both inside and outside the chimney) from material and debris that may
fall from above.
(b) The employers must ensure that the canopy or shield slopes to
the outside of the personnel cage.\4\
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\4\ Paragraphs (a) and (b) were adapted from OSHA's Underground
Construction standard (29 CFR 1926.800(t)(4)(iv)).
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13. Emergency-Escape Device
(a) Location. The employers must provide an emergency-escape device
in at least one of the following locations:
(i) In the personnel cage, provided that the device is long enough
to reach the bottom landing from the highest possible escape point; or
(ii) At the bottom landing, provided that a means is available in
the personnel cage for the occupants to raise the device to the highest
possible escape point.
(b) Operating instructions. The employers must ensure that written
instructions for operating the emergency-escape device are attached to
the device.
(c) Training. The employers must instruct each worker who uses a
personnel cage for transportation on how to operate the emergency-
escape device:
(i) Before the worker uses a personnel cage for transportation; and
(ii) Periodically, and as necessary, thereafter.
14. Personnel Platforms
(a) Personnel platforms. When the employers elect to replace the
personnel cage with a personnel platform in accordance with Condition
2(a) of this variance, they must:
(i) Ensure that an enclosure surrounds the platform, and that this
enclosure is at least 42 inches (106.7 cm) above the platform's floor;
(ii) Provide overhead protection when an overhead hazard is, or
could be, present; and
(iii) Comply with the applicable scaffolding strength requirements
specified by 29 CFR 1926.451(a)(1).
15. Protecting Workers From Fall and Shearing Hazards
(a) Fall hazards. The employers must:
(i) Before workers use personnel cages, personnel platforms, or
boatswain's chairs, equip the workers with, and ensure that they use,
personal fall-arrest systems that meet the requirements of 29 CFR
1926.502(d);
(ii) Ensure that workers using personnel cages secure their fall-
arrest systems to attachment points located inside the cage;
(iii) Ensure that workers using personnel platforms and boatswain's
chairs secure their personal fall-arrest systems to a vertical
lifeline; and
(iv) When using vertical lifelines:
(A) Secure the lifelines to the top of the chimney;
(B) Weight the lifelines properly or suitably affix the lifelines
to the bottom of the chimney; and
(C) Ensure that workers remain attached to their lifeline during
the entire period of vertical transit.
(b) Shearing hazards. The employers must:
(i) Provide workers who use personnel platforms or boatswain's
chairs with instruction on the shearing hazards posed by the hoist
system (e.g., work platforms, scaffolds), and the need to keep their
limbs or other body parts clear of these hazards during hoisting
operations;
(ii) Provide the instruction on shearing and struck-by hazards:
(A) Before a worker uses a personnel platform or boatswain's chair
at the worksite; and
(B) Periodically, and as necessary, thereafter, including whenever
a worker demonstrates a lack of knowledge about the hazards or how to
avoid the hazards, a modification occurs to an existing shearing or
struck-by hazard, or a new shearing or struck-by hazard develops at the
worksite; and
(iii) Attach a readily visible warning to each personnel platform
and boatswain's chair notifying workers in a language they understand
of potential shearing hazards they may encounter during hoisting
operations, and that uses the following (or equivalent) wording:
(A) For personnel platforms: "Warning--To avoid serious injury,
keep your hands, arms, feet, legs, and other parts of your body inside
this platform while it is in motion"; and
(B) For boatswain's chairs: "Warning--To avoid serious injury, do
not extend your hands, arms, feet, legs, or other parts of your body
from the side or to the front of this chair while it is in motion."
16. Safety Zone
The employers must:
(a) Establish a clearly designated safety zone around the bottom
landing of the hoist system; and
(b) Prohibit any worker from entering the safety zone except to
access a personnel- or material-transport device, and then only when
the device is at the bottom landing and not in operation (i.e., when
the drive components of the hoist machine are disengaged and the
braking mechanism is properly applied).
17. Inspections, Tests and Accident Prevention
(a) The employers must:
(i) Conduct inspections of the hoist system as required by 29 CFR
1926.20(b)(2);
(ii) Ensure that a competent person conducts daily visual
inspections of the hoist system; and
(iii) Inspect and test the hoist system as specified by 29 CFR
1926.552(c)(15).
(b) The employers must comply with the accident-prevention
requirements of 29 CFR 1926.20(b)(3).
18. Welding
(a) The employers must use only qualified welders to weld
components of the hoisting system.
(b) The employers must ensure that the qualified welders:
(i) Are familiar with the weld grades, types, and materials
specified in the design of the system; and
(ii) Perform the welding tasks in accordance with 29 CFR 1926,
subpart J ("Welding and Cutting").
19. OSHA Notification
(a) At least 15 calendar days prior to commencing any chimney-
construction operation using the conditions specified herein, the
employers must notify the OSHA Area Office nearest to the worksite of
the operation, including the location of the operation and the date
that the operation will commence.
(b) Each employer must inform OSHA national headquarters as soon as
it has knowledge that it will:
(i) Cease to do business; or
(ii) Transfer the activities covered by this permanent variance to
a successor company.
VII. Authority and Signature
Jordan Barab, Acting Assistant Secretary of Labor for Occupational
Safety and Health, U.S. Department of Labor, 200 Constitution Ave.,
NW., Washington, DC directed the preparation of this notice. OSHA is
issuing this notice under the authority specified by Section 6(d) of
the Occupational Safety and Health Act of 1970 (29 U.S.C. 655),
Secretary of Labor's Order No. 5-2007 (72 FR 31160), and 29 CFR part
1905.
Signed at Washington, DC, on July 14, 2009.
Jordan Barab,
Acting Assistant Secretary of Labor for Occupational Safety and Health.
[FR Doc. E9-17023 Filed 7-16-09; 8:45 am]
BILLING CODE 4510-26-P
