566 NIOHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

SCHEDULE.

MANNEB OP TEST AND EXAMINATION BEPORE TAKING LIFTING MAOHINEBY AND

GEAE INTO USE.

(a) Every winch with the whole of the gear accessory thereto (including
derricks, goosenecks, eye-plates, eye-bolts or other attachments) shall be tested
with a proof load which shall exceed the safe working load as follows :—

5

Safe working load. . Proof load.

Up to 20 tons. 25 per cent, in excess.

20-50 tons. 5 tons in excess.

Over 50 tons. 10 per cent, in excess.

The proof load shall be applied either (i) by hoisting movable weights or
(ii) by means of a spring or hydraulic balance or similar appliance, with the
derrick at an angle to the horizontal which shall be stated in the certificate of
the test. In the former case, after the movable weights have been hoisted,
the derrick shall be swung as far as possible in both directions. In the latter
case, the proof load shall be applied with the derrick swung as far as practicable
first in one direction and then in the other.

(6) Every crane and other hoisting machine with its accessory gear shall
be tested with a proof load which shall exceed the safe working load as follows:

Safe working load. Proof load.

Up to 20 tons. 25 per cent, in excess.

20-50 tons. 5 tons in excess.

Over 50 tons. 10 per cent, in excess.

The said proof load shall be hoisted and swung as far as possible in both
directions. In the case of a jib-crane, if the jib has a variable radius, it shall
be tested with a proof load as defined above at the maximum and minimum
radii of the jib. In the case of hydraulic cranes or hoists where, owing to the
liimitation of pressure, it is impossible to hoist a load 25 per cent, in excess -of
the safe working load, it shall be sufficient to hoist- the greatest possible load,
(c) Every article of loose gear (whether it is accessory to a machine or
not) shall be tested with a proof load at least equal to that shown against the
article in the following table :—

Article of Gear. Proof load.

Chain ...............

Twice the safe working load.

Hook ...............
Shackle ...............
Swivel ...............
Puftey Blocks:
bingle Sheave Block ......... Four times the sate
load.
Multiple Sheave Block with safe work- j
mg load up to and including 20 > Twice the safe working load-
fcsas ...........,. ., j