Mailing List Archive Mailing List Archive
Jason Rogers <gasdive@sy*.DI*.oz*.au*> wrote (Subject: Re: DIN Thread Size):- > PPS Careful you don't get some funny american tap into it. The pitch is the > same (14 tpi) as some American threads, but the thread form is different (55 > vs 60 degrees) We've just had a cylinder fail its test because the inspector spotted that it was a USA tank with 3/4 npsm/c threads, and a 3/4 BSP pillar valve. Apparently, they are very similar, both being 14 threads per inch. (npsm = American National Standard Straight Pipe Thread for free fitting Mechanical joints. BSP = British Standard Pipe thread) This tank had passed at least 6 previous inspections. There was also no clear Working Pressure stamped on it, except for the code DOT 3AA2250, which (I found out later) meant a WP of 2250 psi or 155 bar and a test pressure of 3750 psi (259 bar). The shop kindly blew it to 220 bar (cold) for me to take home! Bill.Dyer@mi*.co*.uk*
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]