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Some symbolic identifiers; I need some help with them

2018-09-19View Original

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Socket weld tee fittings: PN6.3MPa, Do=19mm; PN16 MPa, Do=19mm; PN6.3MPa, Do=19mm. Is DO=19MM equivalent to an outer diameter of 19? Butt-welded straight-through terminal fitting PN6.3MPa 1/2NPT(M)-∅18 PN6.3MPa 1/2NPT(M)-∅18 – is 18 the inner diameter?

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