ACME thread gauges
ACME thread gauges
(OP)
I work in the Propane industry and we use ACME threads as connectors for our transfer hoses. We have recently had a connection fail under pressure due to wear on both the male and female parts of the coupling. The ACME couplings have threads made as either 2.25x6-ACME-2G or 3.25x6-ACME-2G. We want to get No Go gauges to test both the male and female sides of the couplings (so, a total of four No Go gauges) so that we can ascertain when they've reached a reasonable amount of wear and need replacing.
My question is what is a reasonable amount of wear and how do I specify that to a precision toolmaker so he can make me some gauges?
I know that it is probably easiest to just visually inspect them, but we have a large number of sites and the local guys don't really know what they're looking for.
Gopher
My question is what is a reasonable amount of wear and how do I specify that to a precision toolmaker so he can make me some gauges?
I know that it is probably easiest to just visually inspect them, but we have a large number of sites and the local guys don't really know what they're looking for.
Gopher





RE: ACME thread gauges
RE: ACME thread gauges
I still would talk to the coupling manufacturer about the problem. I know he doesn’t want his coupling involved in a failure anymore than you want a failure.
http://www.gaging.com/
RE: ACME thread gauges
I am trying to get some sense out of the manufacturer but they are in the US and I'm in Australia. A resounding silence is all I've got so far, which is why I tried posting this query.
Generally speaking, everything in the LPG industry is UL approved.
As far as I can find, ACME threads are covered by the American Standard B1.5-1952. I have a copy of the relevant part of this standard and it tells you all about how to make a new thread. However, it does not say how much wear should be allowed on a used one.
RE: ACME thread gauges
RE: ACME thread gauges
Thanks
RE: ACME thread gauges
It's commendable on your part wanting to ensure that the connecters are functional and safe.