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CS[_3_] October 21st 09 03:13 PM

NPT and BSP taper threads
 
I am looking at getting some water filters, 20 inch housings, with 3/4
inch NPT female connections in plastic tops. Can I get away with
screwing in 3/4 BSP TAPER male brass compression fittings, using a
good wind of PTFE tape??
Both NPT and BSPT are 14 TPI and the nominal NPT is 1.050 inch OD and
BSPT is
fractionally smaller at 1.041 inch OD, so should fit in. I know that
there is a 5 degree difference between thread angle.

TVMIA

Mike Worrall October 21st 09 04:10 PM

NPT and BSP taper threads
 
You could certainly try to get away with it, or - perhaps more seaman-
like - install an NPT - BSPT adapter.

A quick search shows wide availability, including:

http://www.mcmaster.com/#brass-threa...ttings/=45nv6s

MW
Los Angeles

CS[_3_] October 21st 09 07:08 PM

NPT and BSP taper threads
 
On 21 Oct, 16:10, Mike Worrall wrote:
You could certainly try to get away with it, or - perhaps more seaman-
like - install an NPT - BSPT adapter.

A quick search shows wide availability, including:

http://www.mcmaster.com/#brass-threa...ttings/=45nv6s

MW
Los Angeles


Thanks - at $32 a piece and I need 10 plus shipping etc will be quite
pricey!!

Van Lew November 1st 09 12:52 AM

NPT and BSP taper threads
 
CS wrote in news:11b8e186-0d18-4d13-8a3b-
:

I am looking at getting some water filters, 20 inch housings, with 3/4
inch NPT female connections in plastic tops. Can I get away with
screwing in 3/4 BSP TAPER male brass compression fittings, using a
good wind of PTFE tape??
Both NPT and BSPT are 14 TPI and the nominal NPT is 1.050 inch OD and
BSPT is
fractionally smaller at 1.041 inch OD, so should fit in. I know that
there is a 5 degree difference between thread angle.

TVMIA


I'm in the hose and fittings business so I deal with this pretty often.
Generally we say not to try it on a hydraulic system, but sometimes you
can get away with it on a pneumatic system because the preasures are much
lower. I'd suggest just finding compression fitings with NPT threads.
VV

[email protected] October 11th 14 11:58 AM

NPT and BSP taper threads
 
2009 m. spalis 21 d., trečiadienis 22:13:51 UTC+8, CS rašė:
I am looking at getting some water filters, 20 inch housings, with 3/4
inch NPT female connections in plastic tops. Can I get away with
screwing in 3/4 BSP TAPER male brass compression fittings, using a
good wind of PTFE tape??
Both NPT and BSPT are 14 TPI and the nominal NPT is 1.050 inch OD and
BSPT is
fractionally smaller at 1.041 inch OD, so should fit in. I know that
there is a 5 degree difference between thread angle.

TVMIA


WHAT FITTING I WILL USE IN BSP IF THE OUTSIDE DIAMETER OF MY PIPE WITH THREAD IS 21MM?

[email protected] October 12th 14 04:49 AM

NPT and BSP taper threads
 
On Sat, 11 Oct 2014 03:58:07 -0700 (PDT), wrote:

2009 m. spalis 21 d., tre?iadienis 22:13:51 UTC+8, CS ra?:
I am looking at getting some water filters, 20 inch housings, with 3/4
inch NPT female connections in plastic tops. Can I get away with
screwing in 3/4 BSP TAPER male brass compression fittings, using a
good wind of PTFE tape??
Both NPT and BSPT are 14 TPI and the nominal NPT is 1.050 inch OD and
BSPT is
fractionally smaller at 1.041 inch OD, so should fit in. I know that
there is a 5 degree difference between thread angle.

TVMIA


WHAT FITTING I WILL USE IN BSP IF THE OUTSIDE DIAMETER OF MY PIPE WITH THREAD IS 21MM?


U.S. Standard 1/2 inch taper pipe thread has a OD of 0.840 inch and 14
threads per inch
British standard taper pipe thread has an OD of 0.825 inch and 14
threads per inch.
Your measurement of 21 MM is equal to 0.826 inch.

As taper pipe threads are, of course, tapered, your US and British
standard pipe threads will certainly screw together with no problems.
--
Cheers,

Bruce in Bangkok


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