2.3.1
Load Block and Hook
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NOTE: For LANTNAVFACENGCOM, add bracketed paragraph.
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Construct the load block of steel. Provide forged steel, safety type hook,
with hook nut keyed to hook shank by means of a setscrew installed in a
plane parallel to the longitudinal axis of the hook shank, or other similar
easily removable securing device. Provide hook with spring loaded steel
safety latch for closing the hook throat opening. The hook shall be
unpainted. [Each hook and hook nut shall be capable of complete
disassembly which enables access to all surfaces of 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.]
2.3.1.1
Hook and Hook Nut Magnetic-Particle Tests
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NOTE: For LANTNAVFACENGCOM, substitute bracketed
paragraph.
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Magnetic-particle inspect the hook and nut over the entire 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 with its length 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. I 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. Weld repairs for defects on hook or hook nut
will not be permitted.
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.]
SECTION 14636N
Page 11
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