2.1.7.2
Hook and Hook Nut
ASME B30.10, except as modified and supplemented in this specification
section.
Magnetic-particle inspect the entire surface area in accordance with ASTM A
275/A 275M. Acceptance standard shall be no defects. A defect is defined
as a linear indication that is greater than 3 mm 1/8 inch long whose length
is equal to or greater than three times its width.
Each hook, including shank and hook nut, shall be inspected over the entire
surface areas by magnetic particle inspection. If hook nut is not used,
any device that functions the same as the hook nut shall be inspected by
magnetic particle inspection.
a.
Procedure: Magnetic particle inspection shall be conducted in
accordance with ASTM A 275/A 275M. This inspection shall be
conducted at the factory of the hook manufacturer or hoist
manufacturer. Alternately, a recognized independent testing lab
may conduct the inspections if equipped and competent to perform
such a service, and if approved by the Contracting Officer.
b.
Acceptance Criteria: Defects found on the hook or hook nut shall
result in rejection of defective items for use on furnished hoist.
For this inspection, a defect is defined as a linear or
non-linear indication for which the largest dimension is greater
than 3 mm 1/8 inch.
c.
Test Report: A test report of the magnetic particle inspection of
each hook and hook nut provided shall be submitted to and approved
by the Contracting Officer prior to final acceptance of hoist
installation. Test reports shall be certified by the testing
organization.
d.
Weld Repair: Weld repairs for defects on hooks or hook nuts will
not be acceptable.
2.1.7.3
Hoisting Rope
FS RR-W-410, improved or extra improved plow steel, regular lay, uncoated,
6 by 37 class construction, with an independent wire rope core. Provide
double reeved reeving arrangement. Connect hoisting rope dead end to
equalizer bars (if used) by means of zinc-speltered sockets or swaged
fittings installed in a manner which develops the full breaking strength of
the hoisting rope.
Anchor hoisting rope ends on the drum by means of swaged fittings or by
clamping. Neatly and securely seize hoisting rope ends with corrosion
resistant wire, except where terminated in zinc-speltered sockets or swaged
fittings.
Provide wire rope minimum safety factor of 5 to 1 based on the ratio of
actual minimum wire rope breaking load to the calculated load on rope when
hoist is assumed loaded to rated capacity. Certification from rope
manufacturer verifying provided wire rope breaking strength, shall be
approved by the Contracting Officer. No paint or coatings will be allowed
on the wire rope. Minimum length of the wire rope shall enable the load
hook to operate through its full hook lift range and still have a minimum
of two full wraps of wire rope around the rope drum.
SECTION 14637N
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