This standard provides an equivalence table of certain natural fiber ropes and chemical fiber ropes for mooring ships. This standard applies to these ropes specified in the following national standards and professional (departmental) standards. GB8050 Characteristics of three-strand and eight-strand polypropylene monofilament or film ropes GB/T11786 Three-strand polyamide multifilament ropes GB/T11787 Three-strand polyester multifilament ropes SC12 white brown rope GB/T 11789-1989 Ropes and rope products Equivalence between natural fiber ropes and chemical fiber ropes for mooring ships GB/T11789-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Ropes and cordage products
Equivalence between natural fibre ropes and man-made fibre ropes for use in the mooring of vessels This standard refers to and adopts the international standard 1S03505-1975 "Ropes and cordage products-Equivalence between man-made fibre ropes".
GB/T11789-89
-Natural fibre ropes and man-made fibre ropes for use in the mooring of vessels This standard only deals with ropes for mooring, and towing issues have not been studied. Despite this limitation, the following equivalence table can serve as a guide for rope users until more complete information on towing issues is available. Subject content and scope of application
This standard provides an equivalence table for certain natural fibre ropes and man-made fibre ropes for use in mooring vessels. This standard applies to these ropes as specified in the following national standards and professional (departmental) standards. GB8050 Characteristics of three-strand and eight-strand propylene monofilament or film ropes GB/T11786 Three-strand polyamide multifilament rope
GB/T 11787 Blue polyester multifilament rope
SC 12 white brown rope
2 Equivalency table between natural fiber ropes and chemical fiber ropes (recommended minimum values) For factors to be noted when listing the equivalence table between natural fiber ropes and chemical fiber ropes, see Appendix A (supplement). White hemp rope
Special grade
Nominal diameter
Line density
Manila hemp rope
First grade
ISO 1181-1973
Reference diameter
State Administration of Technical Supervision 1989-11-06 approved polyamide ropebzxZ.net
Superior grade
GB/T 11786
ISO 1140-1976
Reference diameter
Superior grade
GB/T 11787
ISO 1141-1976
Reference diameter
Polypropylene rope
Superior grade
GB8050
IS0 1346-1975
Reference diameter
1990-07-01 implementation
GB/T 11789--89
Appendix A
Factors to be noted in the comparison table between natural fiber ropes and chemical fiber ropes
(Supplement)
Chemical fiber ropes are currently widely used for mooring and towing of ships. Chemical fiber ropes have superior properties to natural fiber ropes, with high strength and great ability to absorb energy under impact loads. Simply providing chemical fiber ropes with the same breaking strength to replace natural fiber ropes is not satisfactory. The following main factors need to be considered when listing the equivalence table between natural fiber ropes and chemical fiber ropes: If a chemical fiber rope of the same strength is used to replace a natural fiber rope, the rope diameter will be very small. Because of the smaller cross-sectional area, the rope will lose a higher part of its strength during use due to wear, abrasion, cutting and other forms of surface damage caused by friction with external objects. When the deck equipment used is not specially designed for chemical fiber ropes, it may cause excessive wear and breakage; the high elongation and recovery characteristics of chemical fiber ropes under load will cause internal wear between the rope strands; some chemical fiber ropes are damaged by melting due to frictional heat; d. Most chemical fiber ropes lose strength when heated, especially polyolefin ropes covered in this standard, mostly depending on the relationship between the operating temperature and the melting point of the material. 1. As for polyamide ropes, there is some loss of strength when wet; &. All textile fibers lose strength when exposed to sunlight. This effect depends on the type of fiber, the cross-sectional area of ​​the rope, the geographical location of use, the exposure time and the amount and type of stabilizer used; h. In case of rope breakage, the released energy will cause high-speed rewinding, which will be dangerous to people. Due to the hysteresis effect, the energy absorption capacity of all ropes will be reduced once they are used. Additional remarks:
This standard is proposed by the Ministry of Textile Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Textile Industry. This standard is drafted by China Textile University and jointly drafted by Shanghai Textile Standard and Metrology Research Institute, Shanghai Wire and Belt Industry Company, and Shanghai Cable Factory.
The main drafters of this standard are Li Yongchun, Hui Yinqiu, and Zhou Xiangshu. 100
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