Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-304 - Safety standards for ship repairing, shipbuilding and shipbreaking › Section 296-304-17003 - Unit proof test-Winches, derricks and gear accessory thereto

Current through Register Vol. 24-14, July 15, 2024
(1) Winches, with
			 the whole of the gear accessory thereto (including derricks, goosenecks, eye
			 plates, eye bolts, or other attachments), must be tested with a proof load
			 which must exceed the safe working load as follows:
Safe working load
Proof load
Up to 20 tons .............
25 percent in excess.
20-50 tons ................
5 tons in excess.
Over 50 tons ..............
10 percent in excess.
(2) The
			 proof load must be lifted with the vessel's normal tackle with the derrick at
			 an angle not more than 15 degrees to the horizontal, or, at the designed
			 minimum angle when this is greater, or, when this is impracticable, at the
			 lowest practicable angle. The angle at which the test was made must be stated
			 in the certificate of test. After the proof load has been lifted, it must be
			 swung as far as possible in both directions. In applying the proof load, the
			 design factors of the gear concerned will determine whether the load is applied
			 with a single part fall or with a purchase and the certificate of test shall
			 state the means used. Where winches are fitted with mechanical brakes for
			 manual operation they must be demonstrated to be in satisfactory operating
			 condition.
(3) In the case of heavy
			 lift derrick barges, proof loads must be applied, except as limited by design
			 and stability considerations, at the maximum and minimum radius for which
			 designed, as well as at any intermediate radius which the surveyor may deem
			 necessary, and must be swung as far as possible in both directions. Data with
			 respect to each proof load applied must be entered in the test
			 certificate.
(4) No items of cargo
			 gear furnished by outside sources must be used as a part of the vessel's gear
			 for the purpose of accomplishing the proof test.
(5) All tests prescribed by this section
			 should in general be carried out by dead load, except that in the case of
			 quadrennial tests, replacements, or renewals, spring or hydraulic balances may
			 be used where dead loads are not reasonably available. However, no exception
			 must be allowed in the case of gear on new vessels.
(6) The test must not be regarded as
			 satisfactory unless the indicator remains constant under the proof load for a
			 period of at least 5 minutes.
(7)
			 The safe working load, determined pursuant to the requirements of this section,
			 must be applicable only to a swinging derrick. When using two fixed derricks in
			 "union purchase" rigs, the safe working load should generally be reduced. It is
			 recommended that owners obtain union purchase safe working load certification
			 based upon design study and analysis by, or acceptable to, a qualified
			 technical office of an accredited gear certification agency, with the
			 recognition that such determinations are valid only for the conditions
			 contemplated in the analysis.
Where both guys and preventers are fitted, union purchase
				certification must state whether the guy or the preventer is the working
				strength member, when the guy is for slewing only, and when the guy and
				preventor should share working loads as far as practicable.
(8) When necessary in the proof testing of
			 heavy derricks, the appropriate shrouds and stays must be rigged.
Order 74-25, § 296-304-17003, filed
				  5/7/74.