API 5L Grade B Pipe Equivalent Fitting Materials

What's in the pipe, its temperature and pressure?

The way I was reading this, its a mechanical only, "skid or pallet" not a pressure fluid containing device. milo

Milo, The Scope of the Project :Hot Tapping a Branch connection of 10" from a 48 " Existing Natural Gas Pipeline. The new 10" Pipe is going to feed a Steel company and for this the pressue needs to reduced from the present 45 bar. For the pressure to be reduced we are making a skid.( a 10mlong X 3m wide)piping arrangement which has valves and other fittings.the Inlet of the skid will have a 45 bar pressure and the outlet of the this skid the product will have a pressure of under 10 bar. Hope you understand what it means when i said a skid.??!!!

As usual a very good answer my friend and you get my GA. This is what I would call standard carbon steel fittings and seamless pipe. It is very common to use this grade of pipe and fittings on steam as well as other services such as 150 lb. steam, hot mill water, and condensate, or at least it is in my area. If this pipe was used on the condensate return side of a same PSI rated steam line we would go to Sch.. 80 on anything below 8" NPS pipe to compensate for the extra wear. This material is what most pipe suppliers keep in stock and is readily available and I consider the pipe as one notch better than SA 53 ERW pipe.

Sir,

it is found that ASTM A234 has grade WPB (Butt welded Fittings ) but Flange materials A105 has no grade specified. Why is it so?

Also what factors are needed to consider when we weld materials of different grades. What is the compatability?

Thanks in Advance.

jinson

All materials API 5L, A234-WPB, A105 & A106-B are carbon steel materials, and are compatible and have the same weldability and closest of their carbon equivalent. So you can use filler metals for SMAW welding of these materials such as E6010, E7010, E7010G & E7018.

No way to weld a materials with a different weldability. I mean no way to weld carbon steel pipe material A106-B with flanges of alloy steel of high temperature service A182-F11 (1.25 Cr-0.5 Mo). Where you have to use a carbon steel flange A105 to be welded with pipe A106-B.

Important note. May be you can find a different materials with different grades but they have the same weldability. In the same time, you can find one material with different grades, but no weldability found between these grades.

For example the material of butt welding fittings A234 have a lot of grades, such as WPB which considered a carbon steel grade with C % 0.30 max. & Cr % 0.4 max. and grade WPB9 which is considered an alloy steel grade with C % 0.15 max. & Cr % 8-10 for higher temperature services, and no weldability found between those grades.

DEAR GENTELMAN !

CAN WE USE ASTM A106 GRADE B INSTEAD OF API 5L GRADE B. ?

REGARDS,

MANSINGH

Yes, you can use ASTM A106 Grade B instead of API 5L Grade B. But vice versa is not correct in many cases, like the tubes at fired heaters, where we can use A106 Grade B, under the same condition we can't use API 5L Grade B instead of it.

The following article is extracted from Paragraph 5.3.5 of API 570-2009 "Piping Inspection Code -Inservice Inspection, Rating, Repair, and Alteration of Piping Systems", which indicates the difference in use of API 5L and A 106:

"Note that nonsilicon killed steel pipe, such as A-53 and API 5L, may corrode at higher rates than does silicon killed steel pipe, such as A-106, especially in high-temperature sulfidic environments".

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I'm a civil engineer but I want to learn.

Which code we can check for selection of this suitable fitting spec? How about A106B and P22 pipe? What is the correct spec for the fitting?

Dear all,

What about ASTM A 53 type E Grade B?

Can I use it interchangeably without differences from API 5L - PS-1 - GR B?

The fluid is cooling water at room temperature.

What are the differences between ASTM A 53 and API 5L?

Thank you.

Dear All,

could you please advise the engineering practice for fitting material selection that compatible with high strength carbon steel pipe API 5L (ex. API 5L X65)?

A860 material come in mind, but actually I have use A694 as my fitting material before (reducer in pig trap)

is there another high pressure carbon steel material that can be used?

on another note, is there an ASME material for fitting and flange that have high yield strength equal to or more than 65000 psi (or close to it)?