valve minimum wall thickness 1

[dwyer]

Hi,

I am trying to calculate the minimum wall thickness required for a check valve. I am using the formula from ASME B31.1-1995 edition, "minimum wall thickness for a staight pipe under internal pressure", Paragrah 104.1.2.

I want to verify some valve designs done in the past.

Is this the correct formula, if not please point me in the right direction.

Thanks in advance,

Dwyer

 

[jalili]

Hi Dwyer;
See DIN 2840. It give you some usefull information.

 

[jalili]

Hi Dwyer;
See DIN 2840. It gives you some usefull information.

 

[GGOSCO]

If you want it to comply to ASME Code, use table 3 of B16.34. Choose the class of valve you are looking to verify( eg.150#, 300# etc.), the inside diameter of the body bore and the table will give you the minimum wall thicknesses. B16.34 also gives you the maximum pressure/temperatures a given material can be used at.

You will find that the table has a margin of safety that is much higher than your calculations for pipe. This is mainly due to the table being designed around the weakest of acceptable materials.

 

[dwyer]

Thanks for replying to my question.

However, I do not have access to the DIN 2840 standard or even the ASME B16.34 code.

Are these available online or is it possible to send me a copy of the section that pertains to valve minimum wall thickness.

Thanks,

Dwyer

 

[dfteng]

As mentioned before, look at minimum wall thickness charts in Table 3 of ANSI B16.34. Also look in API 594.

 

[NGiLuzzu]

Just to be precise: the relevant European standard is DIN 3840 (VALVE BODIES; STRENGTH CALCULATION IN RESPECT OF INTERNAL PRESSURE - 1982) and not DIN 2840 (VACUUM TECHNOLOGY; TERMS AND DEFINITIONS, GENERAL TERMS - 1990).
I'm sorry I don't know where you can find standards without buying them, but try to search the web: although it is not legal, may be someone put something on the net...! ;-)
Bye, 'NGL

 

[cranekiran]

Well!

I guess almost all answers are already given.But then still here goes:-

1)ASME B 16.34 is the best design & testing standard for the developing a valve from scratch.It covers all the revelant materials .Apart from pressure/temp. ratings,min. wall thickness it gives us the NPS vs inside dia & inspection procedures in the valve field.CERTAINLY A MUST HAVE FOR A VALVE ENGINEER.

2)API-600 also gives the min. wall thk & the inside dia's.But this is only for gate valves.It is a good standard for wedge type of gate valves & pressure seal gate valves.

Bye!