Does ASME B16.11 exits with BSPT or BSPP Threads?

[jhonniewalk]

Hi all Piping Gurus,

I have used ASME B16.11 NPT threaded fittings many times on several projects.

Now I'm getting a request to use ASME B16.11 but BSP threaded instead of NPT. To me this is new (I guess there is a first time for everything) and I'm wondering if it's a mistake or it's really possible to have them threaded with BSP and also if they are available on the market or need a special request.

I have search on the Internet, but I didn't find any concrete answer.

So, my questions are:
Does anyone have ever used this type of combination?
Does ASME B16.11 fittings are also possible to be threaded with BSPT or BSPP threads?
Is there any equivalent ASME B16.11 to BS standard?

Thanks for the help.

Regards,
Jhonny

 

[1503-44]

You might find the thread you need in the local market. There seems to be a lot of variations to the thread theme from region to region that is not specifically addressed in the ASME standard.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[IdanPV]

I am not sure this is what you meant.
But you can find fittings with BSPP/T which has the same O.D and thickness as B16.11 fittings.
The things is, those fittings, they won't be standard B16.11 fittings.
In the company I work for, we produce our own BSP fittings (made of BARS) which has the same wall thickness as B16.11 fittings.

 

[Opensource]

Good question to me.

I thought that reading ASME B16.11 chapter 6.3 all fittings threads shall be threaded internal and external according with the NPT American National Standard Taper Pipe Threads (ASME B1.20.1). According to the version I have, the types of pipe threads cover by this standard does not include BSP thread. But searching a lot of suppleirs have ASME B16.11 BSP, BSPT connections. For me is not clear how ASME B16.11 allows it.

 

[LittleInch]

"For me is not clear how ASME B16.11 allows it."

It doesn't.

But suppliers just play fast and loose with their description as other than the thread type, all the dimensions etc are to ASME B 16.11.

You see it all the time. The classic on pipelines is people supplying flanges to ASME B16.5 made from materials like ASTM A694 F60 which isn't listed in the ASME code, but is in MSS-SP-44. The flange will arrive though with ASME B16.5 stamped on it.

My guess is that most of them don't actually know that technically they are supplying a product "generally in accordance with" ASME B16.11. they just miss out the bit in " "....

If you ask for fittings to ASME B16.11 with BSP threads, what is a vendor supposed to do? tell you it's not allowed and lose the order, versus another one who will happily make you fittings to B16.11, just with a slightly different thread pattern?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[IdanPV]

That's why I wrote that they won't be standard B16.11 fittings.
Do you need those to be welded to an ASME VIII-1 pressure vessel?

 

[1503-44]

They could also rewrite the B16 standards, but no.
Good solutions to practical problems.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."