DIN 2982 Screwed Steel Pipe Fittings Parallel Nipples,Taper Nipples
DIN 2616 part2 1991 Steel butt-welding pipe fittings Reducers for use at full service pressure
DIN 2616 part1 1991 Steel butt-welding pipe fittings Eccentric reducers with reduced pressure factor
DIN 2615 part2 1992 Steel butt-welding pipe fittings Tees for use at full service pressure
DIN 2615 part1 1992 Steel butt-welding pipe fittings Tees with reduced pressure factor
DIN 2609 1991 Steel butt-welding pipe fittings-Technical delivery conditions
GOST 17380 : 2001 CARBON AND LOW-ALLOY STEEL BUTT-WELDING FITTINGS - GENERAL SPECIFICATIONS
GOST 17379 : 2001 CARBON AND LOW-ALLOY STEEL BUTT-WELDING FITTINGS - ELLIPTICAL CAPS - DESIGN
GOST 17378-2001 CARBON AND LOW-ALLOY STEEL BUTT-WELDING FITTINGS - REDUCERS - DESIGN
GOST 17376-2001 CARBON AND LOW-ALLOY STEEL BUTT-WELDING FITTINGS - TEES - DESIGN