Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Guy derricks.
(1) The minimum number of guys shall be 6,
with equal spacing, except where a certified agent or derrick manufacturer
approves variations from these requirements and revises the rated capacity to
compensate for such variations.
(2)
Guy derricks shall not be used unless the employer has the following guy
information from the manufacturer or a certified agent, when not available from
the manufacturer:
(A) The number of
guys.
(B) The spacing around the
mast.
(C) The size, grade, and
construction of rope to be used for each guy.
(3) For guy derricks manufactured after
December 18, 1970, in addition to the information required in subsection
(a)(2), the employer shall have the following guy information from the
manufacturer or a certified agent, when not available from the manufacturer:
(A) The amount of initial sag or
tension.
(B) The amount of tension
in guy line rope at anchor.
(4) The mast base shall permit the mast to
rotate freely with allowance for slight tilting of the mast caused by guy
slack.
(5) The mast cap shall:
(A) Permit the mast to rotate
freely.
(B) Withstand tilting and
cramping caused by the guy loads.
(C) Be secured to the mast to prevent
disengagement during erection.
(D)
Be provided with means for attaching guy ropes.
(b) Stiffleg derricks.
(1) The mast shall be supported in the
vertical position by at least two stifflegs; one end of each shall be connected
to the top of the mast and the other end securely anchored.
(2) The stifflegs shall be capable of
withstanding the loads imposed at any point of operation within the load chart
range.
(3) The mast base shall:
(A) Permit the mast to rotate freely (when
necessary).
(B) Permit deflection
of the mast without binding.
(4) The mast shall be prevented from lifting
out of its socket when the mast is in tension.
(5) The stiffleg connecting member at the top
of the mast shall:
(A) Permit the mast to
rotate freely (when necessary).
(B)
Withstand the loads imposed by the action of the stifflegs.
(C) Be secured so as to oppose separating
forces.
(c) Gin
pole derricks.
(1) Guy lines shall be sized
and spaced so as to make the gin pole stable in both boomed and vertical
positions.
EXCEPTION: Where the size and/or spacing of guy lines
do not result in the gin pole being stable in both boomed and vertical
positions, the employer shall ensure that the derrick is not used in an
unstable position.
(2) The
base of the gin pole shall permit movement of the pole (when
necessary).
(3) The gin pole shall
be anchored at the base against horizontal forces (when such forces are
present).
(d) Chicago
boom derricks. The fittings for stepping the boom and for attaching the topping
lift shall be arranged to:
(1) Permit the
derrick to swing at all permitted operating radii and mounting heights between
fittings.
(2) Accommodate
attachment to the upright member of the host structure.
(3) Withstand the forces applied when
configured and operated in accordance with the manufacturer's/builder's
procedures and within its rated capacity.
(4) Prevent the boom or topping lift from
lifting out under tensile forces.
(e) Anchoring and guying.
(1) General requirements.
(A) Derricks shall be guyed and anchored so
as to prevent tipping or collapsing.
(B) Reinforcing steel shall not be used for
guy line anchors.
(C) Load
anchoring data developed by the manufacturer or a certified agent shall be
used.
(2) Guy derricks.
(A) The mast base shall be
anchored.
(B) The guys shall be
secured to the ground or other firm anchorage.
(C) The anchorage and guying shall be
designed to withstand maximum horizontal and vertical forces encountered when
operating within rated capacity with the particular guy slope and spacing
specified for the application.
(3) Stiffleg derricks.
(A) The mast base and stifflegs shall be
anchored.
(B) The mast base and
stifflegs shall be designed to withstand maximum horizontal and vertical forces
encountered when operating within rated capacity with the particular stiffleg
spacing and slope specified for the application.
(f) Swingers and hoists.
(1) The boom, swinger mechanisms and hoists
shall be suitable for the derrick work intended and shall be anchored to
prevent displacement from the imposed loads.
(2) Hoists.
(A) Base mounted drum hoists shall meet the
requirements of ASME B30.7-2011 which is incorporated by reference.
(B) Load tests for new, repaired and modified
hoists. See Article 99 for testing requirements.
(C) Load test procedure. Load tests required
by subsection (f)(2)(B) of this section shall include the following:
1. The test load shall be hoisted a vertical
distance to assure that the load is supported by the hoist and held by the
hoist brake(s).
2. The test load
shall be lowered, stopped and held with the
brake(s).
1. New
subsection (f) filed 2-13-75; effective thirtieth day thereafter (Register 75,
No. 7).
2. Amendment filed 8-29-86; effective thirtieth day
thereafter (Register 86, No. 39).
3. New subsections (a)-(e)(1),
redesignation of former subsections (a)-(b) to new subsections (e)(1)(A)-(B)
and new subsections (e)(1)(C)-(f)(2)(C)2. filed 7-26-2022; operative 7-26-2022
pursuant to Government Code section
11343.4(b)(3)
(Register 2022, No. 30). Filing deadline specified in Government Code section
11349.3(a)
extended 60 calendar days pursuant to Executive Order N-40-20 and an additional
60 calendar days pursuant to Executive Order
N-71-20.
Note: Authority cited: Section
142.3, Labor
Code. Reference: Section
142.3, Labor
Code.
