NPT and BSP taper threads

[CS]

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]

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-threaded-pipe-fittings/=45nv6s

MW
Los Angeles

[CS]

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

[Van Lew]

CS <crms...@googlemail.com> wrote in news:11b8e186-0d18-4d13-8a3b-
a2835d...@d23g2000vbm.googlegroups.com:

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

[com...@gmail.com]

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

[brucein...@invalid.com]

On Sat, 11 Oct 2014 03:58:07 -0700 (PDT), com...@gmail.com wrote:

>2009 m. spalis 21 d., tre?iadienis 22:13:51 UTC+8, CS raš?:

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