3.6 Bore test (hot-dip zinc coated tubes only) 3.7 Manufacturer's certificate Section four. Protection 4.1 General 4.2 Varnish 4.3 Hot-dip zinc coating 4.4 Threads Section five. Tubulars 5.1 General 5.2 Sockets 5.3 Pieces 5.4 Nipples 5.5 Longscrews 5.6 Bends and springs 5.7 Return bends 5.8 Protection Section six. Marking 6.1 Tubes and tubulars
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