London: Lloyd’s Register, 2011. 49 p.This guide has been produced to assist LR Surveyors in the survey of marine chain and fittings according to LR Rules. The intention is to provide guidance on the correct interpretation of the Rules, with regard to the survey of chain during manufacture.As far as possible, the guide uses pictorial examples of imperfections in chain. It should be noted that acceptance or rejection is to be in accordance with the Rules and the images provided are only for guidance purposes.This guide is restricted to chain cable for ships, and covers stud link chain cable, short link chain cables and the more common fittings which are attached to them. The guide does not
specifically relate to mooring chain cables although similar imperfections can potentially arise in them.The guide concentrates on the flash butt welding process for the manufacture of chain. The manufacture of chain by casting or forging is not covered, and neither are the types of imperfections which may arise in casting and forging processes.ContentsIntroduction
How to Use This Guide
Chain Types and Fittings
Stud Link Chain Manufacture
Bar Material
Chain Link Manufacture
Bending
Flash Butt Welding
Trimming
Stud Pressing
Stud Welding
Heat Treatment
Testing: Finished Chain Cables
Proof Load Test
Dimensional Inspection
Five Link length
Link Dimensions
Break Tests
Mechanical Tests
Certification and Stamping of Identity
Appendix – Defect Catalogue
