API SPEC 2F:1997 pdf download

API SPEC 2F:1997 pdf download.Specification for Mooring Chain.
4 Chain Requirements and Tests
4.1 IDENTIFiCATiON OF TEST LINKS
Chain shall be niiinulctwed in continuous length% For identification during mimulaciwe. each length of chain should be marked with a metal hand strapped around the stud nI the second link from either end of the total length. The length number shall be stamped on the metal band. No number should be duplicated.
42 TEST SPECIMEN
During nianufaciurc. a spc.uimii consisting of at least four links shall he taken from the chain in accordance with Table 4 to provide the test specimen fir break tests and mechanical property measurements. After removal nt the specimen from the chain, the specimen shall be identities] with a metal hand placed around the stud of one of the links. The identification shall include the order number, the chain length number, and the test specimen number fiw esample. 2.2-3 could denote the second order, the second length of chain, and the third specimen removed from the second length of chain). A metal band with the tame niarking shall be placed around the stud of the last link in the continuous portion of the chain to denote the location where the specimen was removed. After removal of the specimen. manufacture of the chain shall resume with a new common link being inserted into the last link of the coOtinuous chain length previously constructed.
4.3 MARKING FOR PERMANENT IDENTiFICATION
The mman links marked with nietal bands shall be marked liii permanent identification using the same numbering system described above. Markings shall bean the stud and may be accompli!Jled by a forging stamp or weld metal dqt.
4.4 CHAIN STUD
The studs shall be drop-forged and shall not have limp or protrusions on either end. After the stud is inserted into the oval link, unless otherwise agreed. it shall be cireumferentially welded in place on the end opposite the flash weld. The sue of the fillet weld will comply with the data shown in Fig- mire 3 and Table 5. Only low-hydrogen electrodes shall be used, and the welds are to have good penetration with a maximum undercut not to exceed ‘A inch I millimeter). All welding shall hc pcrftmrmcd prior to the hnal heat treatment. Studs and chain shall meet the same material chemical specification perTable I.
4,5 HEAT TREATMENT OF COMPLETED CHAIN
The chain shall be nomialized. normalized and tempered. or quenched and tempered to produce a fine grain structure throughout the links weld and fusion zone. All chain is to he heat-treated b cuOtinuous processing; batch heat treatment is not permitted.