2.1.3
Hooks
Shall be of the safety type with hook nuts keyed to hook shanks by means of
a setscrew installed in a plane parallel to the longitudinal axis of the
hook shank, or by any other similar easily removable securing device. All
hook components shall be magnetic-particle inspected over the entire area
in accordance with ASTM A 275/A 275M. The acceptance standard shall be one
of no defects. A defect is defined as a linear indication revealed by
magnetic-particle inspection that is greater than 3 mm 1/8 inch long whose
length is equal to or is greater than three times its width.
2.1.4
Trolley
Shall be designed to operate from [[_____] track beam section] [the track
beam section furnished under this contract]. Where two or more hoists are
located on the same monorail beam, the trolleys shall be equipped with
rubber bumper devices designed to prevent contact of any part or parts of
the hoists.
**************************************************************************
NOTE: For LANTNAVFACENGCOM, add the following
paragraphs.
**************************************************************************
2.1.5
Load Chain
High strength steel links, flexible; minimum safety factor of 5 to 1 based
on ratio of minimum chain breaking load to the calculated load on the chain
when the hoist is assumed loaded to rated capacity. Certification from
hoist manufacturer of provided chain's breaking strength shall be submitted
to Contracting Officer and approved prior to final acceptance of hoist. Do
not paint or coat the load chain.
2.1.6
Load Hooks and Load Hook Components
2.1.6.1
Hook
Forged steel; complete with spring-loaded steel throat opening safety
device. The hook shall be carried on suitably sealed or shielded
anti-friction thrust bearings and shall swivel freely through 360 degrees
rotation with full load without twisting chain.
a.
Disassembly. Hook and hook nut shall be capable of complete
disassembly that enables access to all surfaces of the hook,
including shank and hook nut for inspection purposes. Provision
shall be made for the hook nut, or other hook-to-block fastener,
to be keyed to hook shank by means of a set screw or similar,
easily removable, securing device.
b.
Hook Non-Destructive Test. 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.
(1) 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
SECTION 14534N
Page 7
Previous Page
