Extract of Dock Safety Rules, Regulations 47(1) & 51 (2)
a) In case of a single sheave block, the SWL shall be the maximum load which can safety be lifted by the Block when suspended by its head fitting and the load is attached to a rope which passes around the sheave of the block and the test load not less than four times the proposed safe working load shall be applied to the head of the block.
b) In case of a multi - sheave block, the test load shall not be less than the following:
SWL (in tonnes)
upto 25 Above 25 to 160 bove 160
Test Load (in tonnes)
2 x Safe working Load (SWL) (0.933 x SWL) + 27 A 1.1 x SWL
c) In case of hand operated pulley blocks used with pitched chains and rings, hooks, shackles or swivels permanently attached there to a test load not less than 50 percent on excess of the safe working load shall be applied
d) In the case of a pulley block fitted with the bucket, the bucket shall be tested and the tested and the test load applied to the bucket while testing the block will be accepted as test loading of the bucket.
Quadrapulate Sheave Pulley Block
Sheave Dia. (mm)
Wire Rope Dia. (mm)
SWL (tons)
TEST (tons)
Weight Approx each (kgs)
14" (350)
20-24
30
55
14" (350)
24-28
40
64
16" (400)
24-28
40
64
16" (400)
24-28
50
74
18" (450)
24-28
50
74
18" (450)
28-32
60
83
20" (500)
32-38
100
120
Note 1: In the interest of constant research & development we reserve the right to change the design & specifications without notice. Note 2: The weight of each block is based upon the thickness of side plates, Supporting Plates, type of Pin & Sheave. The weight can vary from different designs and shapes.
