WAC 296-24-23515
Hoisting equipment. (1) Sheaves.
(a) Sheave grooves shall be smooth and free from surface
defects which could cause rope damage.
(b) Sheaves carrying ropes which can be momentarily unloaded
shall be provided with close-fitting guards or other suitable
devices to guide the rope back into the groove when the load is
applied again.
(c) The sheaves in the bottom block shall be equipped with
close-fitting guards that will prevent ropes from becoming fouled
when the block is laying on the ground with ropes loose.
(d) Pockets and flanges of sheaves used with hoist chains
shall be of such dimensions that the chain does not catch or bind
during operation.
(e) All running sheaves shall be equipped with means for
lubrication. Permanently lubricated, sealed and/or shielded
bearings meet this requirement.
(2) Ropes.
(a) In using hoisting ropes, the crane manufacturer's
recommendation shall be followed. The rated load divided by the
number of parts of rope shall not exceed 20 percent of the
nominal breaking strength of the rope.
(b) Socketing shall be done in the manner specified by the
manufacturer of the assembly.
(c) Rope shall be secured to the drum as follows:
(i) No less than two wraps of rope shall remain on the drum
when the hook is in its extreme low position.
(ii) Rope end shall be anchored by a clamp securely attached
to the drum, or by a socket arrangement approved by the crane or
rope manufacturer.
(d) Rope clips attached with U-bolts shall have the U-bolts
on the dead or short end of the rope. Spacing and number of all
types of clips shall be in accordance with (2)(e) of this
section. Clips shall be drop-forged steel in all sizes
manufactured commercially. When a newly installed rope has been
in operation for an hour, all nuts on the clip bolts shall be
retightened.
(e)
Diameter
of Rope
|
Number of Clips
Required
|
Space Between
Clips |
| 1 |
1/2 |
|
inch |
8 |
10 |
|
|
inches |
| 1 |
3/8 |
|
inch |
7 |
9 |
|
|
inches |
| 1 |
1/4 |
|
inch |
6 |
8 |
|
|
inches |
| 1 |
1/8 |
|
inch |
5 |
7 |
|
|
inches |
| 1 |
|
|
inch |
5 |
6 |
|
|
inches |
| |
7/8 |
|
inch |
5 |
5 |
1/4 |
|
inches |
| |
3/4 |
|
inch |
5 |
4 |
1/2 |
|
inches |
| 3/8 to 5/8 |
|
inch |
4 |
3 |
|
|
inches |
(f) Swaged or compressed fittings shall be applied as
recommended by the rope or crane manufacturer.
(g) Wherever exposed to temperatures, at which fiber cores
would be damaged, rope having an independent wire-rope or
wire-strand core, or other temperature-damage resistant core
shall be used.
(h) Replacement rope shall be the same size, grade, and
construction as the original rope furnished by the crane
manufacturer, unless otherwise recommended by a wire rope
manufacturer due to actual working condition requirements.
(3) Equalizers. If a load is supported by more than one
part of rope, the tension in the parts shall be equalized.
(4) Hooks. Hooks shall meet the manufacturer's
recommendations and shall not be overloaded. Safety latch-type
hooks shall be used or the hook shall be moused.
[Statutory Authority: RCW 49.17.040, 49.17.050, 49.17.240,
chapters 43.22 and 42.30 RCW. 80-17-015 (Order 80-21), §
296-24-23515, filed 11/13/80. Statutory Authority: RCW 49.17.040, 49.17.150, and 49.17.240. 79-08-115 (Order 79-9), §
296-24-23515, filed 7/31/79; Order 73-5, § 296-24-23515, filed
5/9/73 and Order 73-4, § 296-24-23515, filed 5/7/73.]