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Fittings questions?

X

Xylo

Limp Gawd
Joined
Jul 5, 2005
Messages
421
I'm a bit confused about various fittings spec.s I see...is there a document of general info. on such?

I mean, I see the different fitting thread types: NPT, and all the other acronyms...

But what I'm confused about is what relation do the fittings have to do with the actual sizing of the barbed inputs that you screw into them, etc.

For example, I see a lot of things have 3/8" NPT threaded inputs for such fittings, and lots of 1/2" barbed fittings for them that screw in...Does that mean you are actually getting a bit of a restriction as fluid flows into the component? Or, no?

And what about 1/4" BPST?


Thanks for any URLs anyone can point me to, or any words of wisdom... :)
Xylo
 
Xylo said:
I'm a bit confused about various fittings spec.s I see...is there a document of general info. on such?

I mean, I see the different fitting thread types: NPT, and all the other acronyms...

But what I'm confused about is what relation do the fittings have to do with the actual sizing of the barbed inputs that you screw into them, etc.

For example, I see a lot of things have 3/8" NPT threaded inputs for such fittings, and lots of 1/2" barbed fittings for them that screw in...Does that mean you are actually getting a bit of a restriction as fluid flows into the component? Or, no?

Thanks for any URLs anyone can point me to, or any words of wisdom... :)
Xylo
Click to expand...

NPT = National Pipe Taper of Thread
BSPP = British Standard Parallel Pipe = G x/x
BSPT = British Standard Pipe Taper or Thread = R x/x

Pipe sizes are not the same as tubing sizes. For example a 1/4 Pipe = a shade under 1/2" in major thread diameter.

Yes there is a bit of restriction when using certain pipe sizes and there is no real relationship between the tubing size and the pipe size. F.I. you can have a 1" NPT pipe thread on one end and a 8mm tubing size on the other. Conversely you could have a 1/8" pipe thread and on the tubing size have a 3/8" barb on the other. The pipe thread is used to connect two mating parts together. The barb or pushfit device is used to connect the tube.

References:

http://www.plumbingworld.com/pipethreadsizing.html

http://www.eldonjames.com/frames/thread.html

http://mdmetric.com/tech/thdform3.htm

http://mdmetric.com/3550/metricspec.pdf
 
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