STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

Table 4-24
Wire Diameter Tolerance [12]
Hoisting System 577
Wnr Dimwas
Galvanizal
wires
inches mm k k S mm inches mm
0.01 8 - 0.027 0.46 - 0.69 0.00 1 5 0.038 - -
O.Cn8 - 0.059 0.70 - 150 O.Oo20 0.05 1 0.0035 0.089
0.060 - 0.092 1.51 - 2.34 0.m 0.064 0.0042 0.114
0.093 - 0.141 2.35 - 358 0.0030 0.076 0.0055 0.140
0.142 ad larger 3.59 md larger 0.0035 0.075 0.0075 0.190
Lengths. Length of wire rope shall be specified by the purchaser. If minimum
length is critical to the application, it shall be specified and conform to the
following tolerances.
1300 ft (400 m): -0 to +5%
y 1300 ft (400 m): Original tolerance
+ 66 ft (20 m) per each additional 3280 ft (1000 m) or part thereof.
If minimum is not critical to the application, it shall conform to the following
tolerances.
1300 ft (400 m): f2.5%
1300 ft (400 m): Original tolerance
rt 33 ft (10 m) per each additional 3280 ft (1000 m) or part thereof.
Lubrication. All wire rope, unless otherwise specified, shall be lubricated and
impregnated in the manufacturing process with a suitable compound for the
application in amounts best adapted to individual territories. This lubricant
should thoroughly protect the ropes internally and externally to minimize rust
or corrosion until the rope is put in service.
Mooring Wire Rope
Mooring wire rope is used as anchor lines in spread mooring systems, and
shall comply with the all the provisions of Wire Rope.
Wire rope for this use should be one operation, right lay, regular lay,
independent wire rope core, preformed, galvanized or bright. The nominal
strength of galvanized and bright mooring wire rope shall be as specified in
Table 4-25. For bright mooring wire ropes, the wire grade shall comply with
the requirements for Extra Improved Plow Steel, Table 4.2.8 or IS0 Std 2232*
value of 1770 N/mms.
*International Organization for Standardization, Standard '2232-1973, "Drawn Wire for General
Purpose Non-Alloy Steel Wire Ropes-Specifications," available from American National Standards
Institute, 1430 Broadway, New York, New York 10018.