29 Cfr 1910.180

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Occupational Safety and Health Admin., Labor
(ii) Before starting to hoist the following conditions shall be noted:
(a) Hoist rope shall not be kinked.
(b) Multiple part lines shall not be
twisted around each other.
(c) The hook shall be brought over
the load in such a manner as to prevent
swinging.
(iii) During hoisting care shall be
taken that:
(a) There is no sudden acceleration or
deceleration of the moving load.
(b) The load does not contact any obstructions.
(iv) Cranes shall not be used for side
pulls except when specifically authorized by a responsible person who has
determined that the stability of the
crane is not thereby endangered and
that various parts of the crane will not
be overstressed.
(v) While any employee is on the load
or hook, there shall be no hoisting,
lowering, or traveling.
(vi) The employer shall require that
the operator avoid carrying loads over
people.
(vii) The operator shall test the
brakes each time a load approaching
the rated load is handled. The brakes
shall be tested by raising the load a few
inches and applying the brakes.
(viii) The load shall not be lowered
below the point where less than two
full wraps of rope remain on the hoisting drum.
(ix) When two or more cranes are
used to lift a load one qualified responsible person shall be in charge of the
operation. He shall analyze the operation and instruct all personnel involved in the proper positioning, rigging of the load, and the movements to
be made.
(x) The employer shall insure that
the operator does not leave his position
at the controls while the load is suspended.
(xi) When starting the bridge and
when the load or hook approaches near
or over personnel, the warning signal
shall be sounded.
(4) Hoist limit switch. (i) At the beginning of each operator’s shift, the upper
limit switch of each hoist shall be tried
out under no load. Extreme care shall
be exercised; the block shall be
‘‘inched’’ into the limit or run in at
slow speed. If the switch does not oper-

§ 1910.180

ate properly, the appointed person
shall be immediately notified.
(ii) The hoist limit switch which controls the upper limit of travel of the
load block shall never be used as an operating control.
(o) Other requirements, general—(1)
Ladders. (i) The employer shall insure
that hands are free from encumbrances
while personnel are using ladders.
(ii) Articles which are too large to be
carried in pockets or belts shall be lifted and lowered by hand line.
(2) Cabs. (i) Necessary clothing and
personal belongings shall be stored in
such a manner as not to interfere with
access or operation.
(ii) Tools, oil cans, waste, extra fuses,
and other necessary articles shall be
stored in the tool box, and shall not be
permitted to lie loose in or about the
cab.
(3) Fire extinguishers. The employer
shall insure that operators are familiar
with the operation and care of fire extinguishers provided.
[39 FR 23502, June 27, 1974, as amended at 40
FR 27400, June 27, 1975; 49 FR 5322, Feb. 10,
1984; 51 FR 34560, Sept. 29, 1986; 55 FR 32015,
Aug. 6, 1990; 61 FR 9239, Mar. 7, 1996]

§ 1910.180 Crawler
locomotive
and
truck cranes.
(a) Definitions applicable to this section. (1) A crawler crane consists of a rotating superstructure with power
plant, operating machinery, and boom,
mounted on a base, equipped with
crawler treads for travel. Its function
is to hoist and swing loads at various
radii.
(2) A locomotive crane consists of a rotating superstructure with powerplant, operating machinery and boom,
mounted on a base or car equipped for
travel on railroad track. It may be selfpropelled or propelled by an outside
source. Its function is to hoist and
swing loads at various radii.
(3) A truck crane consists of a rotating superstructure with powerplant,
operating machinery and boom, mounted on an automotive truck equipped
with a powerplant for travel. Its function is to hoist and swing loads at various radii.
(4) A wheel mounted crane (wagon
crane) consists of a rotating superstructure with powerplant, operating

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§ 1910.180

29 CFR Ch. XVII (7–1–09 Edition)

machinery and boom, mounted on a
base or platform equipped with axles
and rubber-tired wheels for travel. The
base is usually propelled by the engine
in the superstructure, but it may be
equipped with a separate engine controlled from the superstructure. Its
function is to hoist and swing loads at
various radii.
(5) An accessory is a secondary part or
assembly of parts which contributes to
the overall function and usefulness of a
machine.
(6) Appointed means assigned specific
responsibilities by the employer or the
employer’s representative.
(7) ANSI means the American National Standards Institute.
(8) An angle indicator (boom) is an accessory which measures the angle of
the boom to the horizontal.
(9) The axis of rotation is the vertical
axis around which the crane superstructure rotates.
(10) Axle means the shaft or spindle
with which or about which a wheel rotates. On truck- and wheel-mounted
cranes it refers to an automotive type
of axle assembly including housings,
gearing, differential, bearings, and
mounting appurtenances.
(11) Axle (bogie) means two or more
automotive-type axles mounted in tandem in a frame so as to divide the load
between the axles and permit vertical
oscillation of the wheels.
(12) The base (mounting) is the traveling base or carrier on which the rotating superstructure is mounted such
as a car, truck, crawlers, or wheel platform.
(13) The boom (crane) is a member
hinged to the front of the rotating superstructure with the outer end supported by ropes leading to a gantry or
A-frame and used for supporting the
hoisting tackle.
(14) The boom angle is the angle between the longitudinal centerline of
the boom and the horizontal. The boom
longitudinal centerline is a straight
line between the boom foot pin (heel
pin) centerline and boom point sheave
pin centerline.
(15) The boom hoist is a hoist drum
and rope reeving system used to raise
and lower the boom. The rope system
may be all live reeving or a combination of live reeving and pendants.

(16) The boom stop is a device used to
limit the angle of the boom at the
highest position.
(17) A brake is a device used for retarding or stopping motion by friction
or power means.
(18) A cab is a housing which covers
the rotating superstructure machinery
and/or operator’s station. On truckcrane trucks a separate cab covers the
driver’s station.
(19) The clutch is a friction, electromagnetic, hydraulic, pneumatic, or
positive mechanical device for engagement or disengagement of power.
(20) The counterweight is a weight
used to supplement the weight of the
machine in providing stability for lifting working loads.
(21) Designated means selected or assigned by the employer or the employer’s representative as being qualified to
perform specific duties.
(22) The drum is the cylindrical members around which ropes are wound for
raising and lowering the load or boom.
(23) Dynamic (loading) means loads
introduced into the machine or its
components by forces in motion.
(24) The gantry (A-frame) is a structural frame, extending above the superstructure, to which the boom support
ropes are reeved.
(25) A jib is an extension attached to
the boom point to provide added boom
length for lifting specified loads. The
jib may be in line with the boom or offset to various angles.
(26) Load (working) means the external load, in pounds, applied to the
crane, including the weight of load-attaching equipment such as load blocks,
shackles, and slings.
(27) Load block (upper) means the assembly of hook or shackle, swivel,
sheaves, pins, and frame suspended
from the boom point.
(28) Load block (lower) means the assembly of hook or shackle, swivel,
sheaves, pins, and frame suspended by
the hoisting ropes.
(29) A load hoist is a hoist drum and
rope reeving system used for hoisting
and lowering loads.
(30) Load ratings are crane ratings in
pounds established by the manufacturer in accordance with paragraph (c)
of this section.

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Occupational Safety and Health Admin., Labor
(31) Outriggers are extendable or fixed
metal arms, attached to the mounting
base, which rest on supports at the
outer ends.
(32) Rail clamp means a tong-like
metal device, mounted on a locomotive
crane car, which can be connected to
the track.
(33) Reeving means a rope system in
which the rope travels around drums
and sheaves.
(34) Rope refers to a wire rope unless
otherwise specified.
(35) Side loading means a load applied
at an angle to the vertical plane of the
boom.
(36) A standby crane is a crane which
is not in regular service but which is
used occasionally or intermittently as
required.
(37) A standing (guy) rope is a supporting rope which maintains a constant distance between the points of
attachment to the two components
connected by the rope.
(38) Structural competence means the
ability of the machine and its components to withstand the stresses imposed by applied loads.
(39) Superstructure means the rotating
upper frame structure of the machine
and the operating machinery mounted
thereon.
(40) Swing means the rotation of the
superstructure for movement of loads
in a horizontal direction about the axis
of rotation.
(41) Swing mechanism means the machinery involved in providing rotation
of the superstructure.
(42) Tackle is an assembly of ropes
and sheaves arranged for hoisting and
pulling.
(43) Transit means the moving or
transporting of a crane from one jobsite to another.
(44) Travel means the function of the
machine moving from one location to
another, on a jobsite.
(45) The travel mechanism is the machinery involved in providing travel.
(46) Wheelbase means the distance between centers of front and rear axles.
For a multiple axle assembly the axle
center for wheelbase measurement is
taken as the midpoint of the assembly.
(47) The whipline (auxiliary hoist) is a
separate hoist rope system of lighter

§ 1910.180

load capacity and higher speed than
provided by the main hoist.
(48) A winch head is a power driven
spool for handling of loads by means of
friction between fiber or wire rope and
spool.
(b) General requirements—(1) Application. This section applies to crawler
cranes,
locomotive
cranes,
wheel
mounted cranes of both truck and selfpropelled wheel type, and any variations thereof which retain the same
fundamental characteristics. This section includes only cranes of the above
types, which are basically powered by
internal combustion engines or electric
motors and which utilize drums and
ropes. Cranes designed for railway and
automobile wreck clearances are excepted. The requirements of this section are applicable only to machines
when used as lifting cranes.
(2) New and existing equipment. All
new crawler, locomotive, and truck
cranes constructed and utilized on or
after August 31, 1971, shall meet the design specifications of the American National Standard Safety Code for Crawler, Locomotive, and Truck Cranes,
ANSI B30.5–1968, which is incorporated
by reference as specified in § 1910.6.
Crawler, locomotive, and truck cranes
constructed prior to August 31, 1971,
should be modified to conform to those
design specifications by February 15,
1972, unless it can be shown that the
crane cannot feasibly or economically
be altered and that the crane substantially complies with the requirements
of this section.
(3) Designated personnel. Only designated personnel shall be permitted to
operate a crane covered by this section.
(c) Load ratings—(1) Load ratings—
where stability governs lifting performance. (i) The margin of stability for determination of load ratings, with
booms of stipulated lengths at stipulated working radii for the various
types of crane mountings, is established by taking a percentage of the
loads which will produce a condition of
tipping or balance with the boom in
the least stable direction, relative to
the mounting. The load ratings shall
not exceed the following percentages
for cranes, with the indicated types of
mounting under conditions stipulated

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§ 1910.180

29 CFR Ch. XVII (7–1–09 Edition)

in paragraphs (c)(1) (ii) and (iii) of this
section.
Maximum
load ratings (percent of tipping loads)

Type of crane mounting

Locomotive, without outriggers:
Booms 60 feet or less ..................................
Booms over 60 feet ......................................
Locomotive, using outriggers fully extended .......
Crawler, without outriggers ..................................
Crawler, using outriggers fully extended .............
Truck and wheel mounted without outriggers or
using outriggers fully extended ........................

1 85
1 85

80
75
85
85

1 Unless

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this results in less than 30,000 pound-feet net stabilizing moment about the rail, which shall be minimum with
such booms.

(ii) The following stipulations shall
govern the application of the values in
paragraph (c)(1)(i) of this section for locomotive cranes:
(a) Tipping with or without the use of
outriggers occurs when half of the
wheels farthest from the load leave the
rail.
(b) The crane shall be standing on
track which is level within 1 percent
grade.
(c) Radius of the load is the horizontal distance from a projection of the
axis of rotation to the rail support surface, before loading, to the center of
vertical hoist line or tackle with load
applied.
(d) Tipping loads from which ratings
are determined shall be applied under
static conditions only, i.e., without dynamic effect of hoisting, lowering, or
swinging.
(e) The weight of all auxiliary handling devices such as hoist blocks,
hooks, and slings shall be considered a
part of the load rating.
(iii) Stipulations governing the application of the values in paragraph
(c)(1)(i) of this section for crawler,
truck, and wheel-mounted cranes shall
be in accordance with Crane Load-Stability Test Code, Society of Automotive Engineers (SAE) J765, which is
incorporated by reference as specified
in § 1910.6.
(iv) The effectiveness of these preceding stability factors will be influenced by such additional factors as
freely suspended loads, track, wind, or
ground conditions, condition and inflation of rubber tires, boom lengths,
proper operating speeds for existing
conditions, and, in general, careful and

competent operation. All of these shall
be taken into account by the user.
(2) Load rating chart. A substantial
and durable rating chart with clearly
legible letters and figures shall be provided with each crane and securely
fixed to the crane cab in a location easily visible to the operator while seated
at his control station.
(d) Inspection classification—(1) Initial
inspection. Prior to initial use all new
and altered cranes shall be inspected to
insure compliance with provisions of
this section.
(2) Regular inspection. Inspection procedure for cranes in regular service is
divided into two general classifications
based upon the intervals at which inspection should be performed. The intervals in turn are dependent upon the
nature of the critical components of
the crane and the degree of their exposure to wear, deterioration, or malfunction. The two general classifications are herein designated as ‘‘frequent’’ and ‘‘periodic’’, with respective
intervals between inspections as defined below:
(i) Frequent inspection: Daily to
monthly intervals.
(ii) Periodic inspection: 1- to 12month intervals, or as specifically recommended by the manufacturer.
(3) Frequent inspection. Items such as
the following shall be inspected for defects at intervals as defined in paragraph (d)(2)(i) of this section or as specifically indicated including observation during operation for any defects
which might appear between regular
inspections. Any deficiencies such as
listed shall be carefully examined and
determination made as to whether they
constitute a safety hazard:
(i) All control mechanisms for maladjustment interfering with proper operation: Daily.
(ii) All control mechanisms for excessive wear of components and contamination by lubricants or other foreign
matter.
(iii) All safety devices for malfunction.
(iv) Deterioration or leakage in air or
hydraulic systems: Daily.
(v) Crane hooks with deformations or
cracks. For hooks with cracks or having more than 15 percent in excess of
normal throat opening or more than 10°

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Occupational Safety and Health Admin., Labor
twist from the plane of the unbent
hook.
(vi) Rope reeving for noncompliance
with manufacturer’s recommendations.
(vii) Electrical apparatus for malfunctioning, signs of excessive deterioration, dirt, and moisture accumulation.
(4) Periodic inspection. Complete inspections of the crane shall be performed at intervals as generally defined in paragraph (d)(2)(ii) of this section depending upon its activity, severity of service, and environment, or as
specifically indicated below. These inspections shall include the requirements of paragraph (d)(3) of this section and in addition, items such as the
following. Any deficiencies such as listed shall be carefully examined and determination made as to whether they
constitute a safety hazard:
(i) Deformed, cracked, or corroded
members in the crane structure and
boom.
(ii) Loose bolts or rivets.
(iii) Cracked or worn sheaves and
drums.
(iv) Worn, cracked, or distorted parts
such as pins, bearings, shafts, gears,
rollers and locking devices.
(v) Excessive wear on brake and
clutch system parts, linings, pawls, and
ratchets.
(vi) Load, boom angle, and other indicators over their full range, for any
significant inaccuracies.
(vii) Gasoline, diesel, electric, or
other power plants for improper performance or noncompliance with safety
requirements.
(viii) Excessive wear of chain-drive
sprockets and excessive chain stretch.
(ix) Travel steering, braking, and
locking devices, for malfunction.
(x) Excessively worn or damaged
tires.
(5) Cranes not in regular use. (i) A
crane which has been idle for a period
of one month or more, but less than 6
months, shall be given an inspection
conforming with requirements of paragraph (d)(3) of this section and paragraph (g)(2)(ii) of this section before
placing in service.
(ii) A crane which has been idle for a
period of six months shall be given a
complete inspection conforming with
requirements of paragraphs (d) (3) and

§ 1910.180

(4) of this section and paragraph
(g)(2)(ii) of this section before placing
in service.
(iii) Standby cranes shall be inspected at least semiannually in accordance with requirements of paragraph (d)(3) of this section and paragraph (g)(2)(ii) of this section. Such
cranes which are exposed to adverse environment should be inspected more
frequently.
(6) Inspection records. Certification
records which include the date of inspection, the signature of the person
who performed the inspection and the
serial number, or other identifier, of
the crane which was inspected shall be
made monthly on critical items in use
such as brakes, crane hooks, and ropes.
This certification record shall be kept
readily available.
(e) Testing—(1) Operational tests. (i) In
addition to prototype tests and quality-control measures, each new production crane shall be tested by the manufacturer to the extent necessary to insure compliance with the operational
requirements of this paragraph including functions such as the following:
(a) Load hoisting and lowering mechanisms.
(b) Boom hoisting and lower mechanisms.
(c) Swinging mechanism.
(d) Travel mechanism.
(e) Safety devices.
(ii) Where the complete production
crane is not supplied by one manufacturer such tests shall be conducted at
final assembly.
(iii) Certified production-crane test
results shall be made available.
(2) Rated load test. (i) Written reports
shall be available showing test procedures and confirming the adequacy of
repairs or alterations.
(ii) Test loads shall not exceed 110
percent of the rated load at any selected working radius.
(iii) Where rerating is necessary:
(a) Crawler, truck, and wheel-mounted cranes shall be tested in accordance
with SAE Recommended Practice,
Crane Load Stability Test Code J765
(April 1961).
(b) Locomotive cranes shall be tested
in accordance with paragraph (c)(1) (i)
and (ii) of this section.

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§ 1910.180

29 CFR Ch. XVII (7–1–09 Edition)

(c) Rerating test report shall be readily available.
(iv) No cranes shall be rerated in excess of the original load ratings unless
such rating changes are approved by
the crane manufacturer or final assembler.
(f) Maintenance procedure—General.
After adjustments and repairs have
been made the crane shall not be operated until all guards have been reinstalled, safety devices reactivated,
and maintenance equipment removed.
(g) Rope inspection—(1) Running ropes.
A thorough inspection of all ropes in
use shall be made at least once a
month and a certification record which
includes the date of inspection, the signature of the person who performed the
inspection and an identifier for the
ropes shall be prepared and kept on file
where readily available. All inspections
shall be performed by an appointed or
authorized person. Any deterioration,
resulting in appreciable loss of original
strength shall be carefully observed
and detemination made as to whether
further use of the rope would constitute a safety hazard. Some of the
conditions that could result in an appreciable loss of strength are the following:
(i) Reduction of rope diameter below
nominal diameter due to loss of core
support, internal or external corrosion,
or wear of outside wires.
(ii) A number of broken outside wires
and the degree of distribution of concentration of such broken wires.
(iii) Worn outside wires.
(iv) Corroded or broken wires at end
connections.
(v) Corroded, cracked, bent, worn, or
improperly applied end connections.
(vi) Severe kinking, crushing, cutting, or unstranding.
(2) Other ropes. (i) Heavy wear and/or
broken wires may occur in sections in
contact with equalizer sheaves or other
sheaves where rope travel is limited, or
with saddles. Particular care shall be
taken to inspect ropes at these locations.
(ii) All rope which has been idle for a
period of a month or more due to shutdown or storage of a crane on which it
is installed shall be given a thorough
inspection before it is used. This inspection shall be for all types of dete-

rioration and shall be performed by an
appointed or authorized person whose
approval shall be required for further
use of the rope. A certification record
which includes the date of inspection,
the signature of the person who performed the inspection, and an identifier for the rope which was inspected
shall be prepared and kept readily
available.
(iii) Particular care shall be taken in
the inspection of nonrotating rope.
(h) Handling the load—(1) Size of load.
(i) No crane shall be loaded beyond the
rated load, except for test purposes as
provided in paragraph (e) of this section.
(ii) When loads which are limited by
structural competence rather than by
stability are to be handled, it shall be
ascertained that the weight of the load
has been determined within plus or
minus 10 percent before it is lifted.
(2) Attaching the load. (i) The hoist
rope shall not be wrapped around the
load.
(ii) The load shall be attached to the
hook by means of slings or other approved devices.
(3) Moving the load. (i) The employer
shall assure that:
(a) The crane is level and where necessary blocked properly.
(b) The load is well secured and properly balanced in the sling or lifting device before it is lifted more than a few
inches.
(ii) Before starting to hoist, the following conditions shall be noted:
(a) Hoist rope shall not be kinked.
(b) Multiple part lines shall not be
twisted around each other.
(c) The hook shall be brought over
the load in such a manner as to prevent
swinging.
(iii) During hoisting care shall be
taken that:
(a) There is no sudden acceleration or
deceleration of the moving load.
(b) The load does not contact any obstructions.
(iv) Side loading of booms shall be
limited to freely suspended loads.
Cranes shall not be used for dragging
loads sideways.
(v) No hoisting, lowering, swinging,
or traveling shall be done while anyone
is on the load or hook.

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Occupational Safety and Health Admin., Labor
(vi) The operator should avoid carrying loads over people.
(vii) On truck-mounted cranes, no
loads shall be lifted over the front area
except as approved by the crane manufacturer.
(viii) The operator shall test the
brakes each time a load approaching
the rated load is handled by raising it
a few inches and applying the brakes.
(ix) Outriggers shall be used when the
load to be handled at that particular
radius exceeds the rated load without
outriggers as given by the manufacturer for that crane. Where floats are
used they shall be securely attached to
the outriggers. Wood blocks used to
support outriggers shall:
(a) Be strong enough to prevent
crushing.
(b) Be free from defects.
(c) Be of sufficient width and length
to prevent shifting or toppling under
load.
(x) Neither the load nor the boom
shall be lowered below the point where
less than two full wraps of rope remain
on their respective drums.
(xi) Before lifting loads with locomotive cranes without using outriggers, means shall be applied to prevent the load from being carried by the
truck springs.
(xii) When two or more cranes are
used to lift one load, one designated
person shall be responsible for the operation. He shall be required to analyze
the operation and instruct all personnel involved in the proper positioning, rigging of the load, and the
movements to be made.
(xiii) In transit the following additional precautions shall be exercised:
(a) The boom shall be carried in line
with the direction of motion.
(b) The superstructure shall be secured against rotation, except when negotiating turns when there is an operator in the cab or the boom is supported on a dolly.
(c) The empty hook shall be lashed or
otherwise restrained so that it cannot
swing freely.
(xiv) Before traveling a crane with
load, a designated person shall be responsible for determining and controlling safety. Decisions such as position
of load, boom location, ground support,
travel route, and speed of movement

§ 1910.180

shall be in accord with his determinations.
(xv) A crane with or without load
shall not be traveled with the boom so
high that it may bounce back over the
cab.
(xvi) When rotating the crane, sudden
starts and stops shall be avoided. Rotational speed shall be such that the load
does not swing out beyond the radii at
which it can be controlled. A tag or restraint line shall be used when rotation
of the load is hazardous.
(xvii) When a crane is to be operated
at a fixed radius, the boom-hoist pawl
or other positive locking device shall
be engaged.
(xviii) Ropes shall not be handled on
a winch head without the knowledge of
the operator.
(xix) While a winch head is being
used, the operator shall be within convenient reach of the power unit control
lever.
(4) Holding the load. (i) The operator
shall not be permitted to leave his position at the controls while the load is
suspended.
(ii) No person should be permitted to
stand or pass under a load on the hook.
(iii) If the load must remain suspended for any considerable length of
time, the operator shall hold the drum
from rotating in the lowering direction
by activating the positive controllable
means of the operator’s station.
(i) Other requirements—(1) Rail clamps.
Rail clamps shall not be used as a
means of restraining tipping of a locomotive crane.
(2) Ballast or counterweight. Cranes
shall not be operated without the full
amount of any ballast or counterweight in place as specified by the
maker, but truck cranes that have
dropped the ballast or counterweight
may be operated temporarily with special care and only for light loads without full ballast or counterweight in
place. The ballast or counterweight in
place specified by the manufacturer
shall not be exceeded.
(3) Cabs. (i) Necessary clothing and
personal belongings shall be stored in
such a manner as to not interfere with
access or operation.
(ii) Tools, oil cans, waste, extra fuses,
and other necessary articles shall be
stored in the tool box, and shall not be

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§ 1910.181

29 CFR Ch. XVII (7–1–09 Edition)

permitted to lie loose in or about the
cab.
(4) Refueling. (i) Refueling with small
portable containers shall be done with
an approved safety type can equipped
with an automatic closing cap and
flame arrester. Refer to § 1910.155(c)(3)
for definition of approved.
(ii) Machines shall not be refueled
with the engine running.
(5) Fire extinguishers. (i) A carbon dioxide, dry chemical, or equivalent fire
extinguisher shall be kept in the cab or
vicinity of the crane.
(ii) Operating and maintenance personnel shall be made familiar with the
use and care of the fire extinguishers
provided.
(6) Swinging locomotive cranes. A locomotive crane shall not be swung into a
position where railway cars on an adjacent track might strike it, until it has
been ascertained that cars are not
being moved on the adjacent track and
proper flag protection has been established.
(j) Operations near overhead lines. For
operations near overhead electric lines,
see § 1910.333(c)(3).

(3) A basket derrick is a derrick without a boom, similar to a gin pole, with
its base supported by ropes attached to
corner posts or other parts of the
structure. The base is at a lower elevation than its supports. The location
of the base of a basket derrick can be
changed by varying the length of the
rope supports. The top of the pole is secured with multiple reeved guys to position the top of the pole to the desired
location by varying the length of the
upper guy lines. The load is raised and
lowered by ropes through a sheave or
block secured to the top of the pole.

[39 FR 23502, June 27, 1974, as amended at 49
FR 5323, Feb. 10, 1984; 51 FR 34561, Sept. 29,
1986; 53 FR 12122, Apr. 12, 1988; 55 FR 32015,
Aug 6, 1990; 61 FR 9239, Mar. 7, 1996]

cprice-sewell on DSKDVH8Z91PROD with CFR

(4) Breast derrick means a derrick
without boom. The mast consists of
two side members spread farther apart
at the base than at the top and tied together at top and bottom by rigid
members. The mast is prevented from
tipping forward by guys connected to
its top. The load is raised and lowered
by ropes through a sheave or block secured to the top crosspiece.

568

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EC27OC91.038

Derricks.

(a) Definitions applicable to this section. (1) A derrick is an apparatus consisting of a mast or equivalent member
held at the head by guys or braces,
with or without a boom, for use with a
hoisting mechanism and operating
ropes.
(2) A-frame derrick means a derrick in
which the boom is hinged from a cross
member between the bottom ends of
two upright members spread apart at
the lower ends and joined at the top;
the boom point secured to the junction
of the side members, and the side members are braced or guyed from this
junction point.

EC27OC91.037

§ 1910.181