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Jul 31 2017

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Pipe Threads IPS / NPT

Author: pbr2424 (NH)

I appear to to be confused about the difference between NPT threads and IPS threads. I have to put some ball valves on some old galvanized pipe and I assumed it was IPS threads. So you would get an IPS ball valve. But IPS means iron pipe straight thread and galvanized and black iron are tapered. Got myself confused. Any help appreciated.

I think I figured it out myself IPS means iron pipe size where FIPS means female iron pipe size. Think I got the wrong imformation in the begining.

Re: Pipe Threads IPS / NPT

Author: SMSPlumbing (PA)

Glad we could help

Re: Pipe Threads IPS / NPT

Author: clarkkent1987robs (Non-US)

Quote

I appear to to be confused about the difference between NPT threads and IPS threads. I have to put some ball valves on some old galvanized pipe and I assumed it was IPS threads. So you would get an IPS ball valve. But IPS means iron pipe straight thread and galvanized and black iron are tapered. Got myself confused. Any help appreciated.

Just to make it clear National Pipe Tapered Thread (NPT) is a US standard for tapered threads used on threaded pipes and fittings. NPT compatibility examples are Male NPT also known as Male Pipe Thread (MPT) and Female NPT also known as Female Pipe Thread (FPT). And an IPS is an abbreviation of Iron Pipe Straight Thread which is the Generic Name for Straight Pipe Thread (NPSH). NPT and NPS/IPS are the pipe thread standards.

Re: Pipe Threads IPS / NPT

quote; And an IPS is an abbreviation of Iron Pipe Straight Thread which is the Generic Name for Straight Pipe

Here I have been using IPS for 60+ years as an abbreviation for EVERYTHING with a thread in, or on, it, and NOW you tell me that I have been wrong.

Re: Pipe Threads IPS / NPT

Author: packy (MA)

i’m curious.
would a left handed nipple/coupling be considered IPS?
as far as i know, the thread pitch and threads per inch are the same as right handed threads, they just go the other way.
so, in the definition of IPS, does it state turn clockwise to tighten ?

Re: Pipe Threads IPS / NPT

No, it would define the thread pitch and and the specifications for the cut, but not the direction, since it would be for an infinitely narrow part of the thread so direction would not be a factor. And as for a straight thread , electricians are the only ones I know who use them.

Re: Pipe Threads IPS / NPT

Author: asktom (MT)

I seem to recall there was a piping system that used straight threads and locknuts. You screwed the pipe into the fitting with a locknut already on the pipe, wrapped some sort of packing material between the fitting and locknut, then tightened the locknut up against the fitting. I think it was a Brit/Aussie thing. I use NPT and IPS interchangeably and have never been challenged on it, but I don’t hang out with engineers.

Author: packy (MA)

besides hj, packy and Methuselah, i wonder if anyone has ever actually used a sisson joint.
i believe i have used only 2.
kaypher Y s and kaypher straight s were the only joints that were legal prior to no hub clamps.
of course there were manhoff sleeves but the were more for adapting to a galvanized pipe without threading.

Re: Pipe Threads IPS / NPT

Author: bernabeu (SC)

IPS: iron pipe size, vague as it may be straight (‘running’) or tapered
by informal convention it is interpreted as tapered unless otherwise stated

NPT: national pipe tapered (same thread as IPS tapered)

NPSM: national pipe straight/standard mechanical (running or straight thread)


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