X70 vs. 516-g70n (normalized) for pressure vessel
X70 vs. 516-g70n (normalized) for pressure vessel
(OP)
I would like an opinion (or better) on whether or not 516-70n (normalized) is a suitable material replacement for API5LX70 (X70) for construction of a pressure vessel - giving consideration to modulus, ksi, etc of both materials (I believe they are similar enough).
vessel design criteria is as follows: 36" OD x 40'long @1500 psi @120*F no corrosion allowance.
I just cant find enough good data on the 516-70n to justify the substitution.
The 516-70 would be purchased in plate form, then rolled and welded, whereas the x70 would be purchased as pipe from the mill and have heads or endcaps welded.
Thanks for any help or suggestions that can be offered. And just FYI - the reason for the switch is material lead time. the x70 takes a lot longer to acquire than the 516-70. If anyone has any other material suggestions, they are gladly welcome.
vessel design criteria is as follows: 36" OD x 40'long @1500 psi @120*F no corrosion allowance.
I just cant find enough good data on the 516-70n to justify the substitution.
The 516-70 would be purchased in plate form, then rolled and welded, whereas the x70 would be purchased as pipe from the mill and have heads or endcaps welded.
Thanks for any help or suggestions that can be offered. And just FYI - the reason for the switch is material lead time. the x70 takes a lot longer to acquire than the 516-70. If anyone has any other material suggestions, they are gladly welcome.





RE: X70 vs. 516-g70n (normalized) for pressure vessel
You might be able to find centrifugal cast 36" diameter. And if money and time are no problem; ring forged/rolled (try Kobe/Japan).
RE: X70 vs. 516-g70n (normalized) for pressure vessel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: X70 vs. 516-g70n (normalized) for pressure vessel
RE: X70 vs. 516-g70n (normalized) for pressure vessel
Lampropeltis, first of all you need to have clear, among other things what will be the use of this pipe (the fluid or sustance it will be conveying), the changes in temperature of that fluid that can provoke expansion/contraction of itself, etc.
In general terms, the chemical composition of these materials is:
ASTM A516-70: C, Mn, P, S, Si.
API 5LX70: C, Mn, P, S, Si, Nb, Ti, Ni, Al, B, Ca, Cr, Mo, Cu, V, Pb, Co.
Normally the steel A516-70 is used when high mechanical strenght is a decisive factor and the temperature of the fluid is from low to moderated.
The steel pipe API 5LX70 is generally intended to be used for the transportation of gas and/or fuel oils.
El que no puede andar, se sienta.
RE: X70 vs. 516-g70n (normalized) for pressure vessel
RE: X70 vs. 516-g70n (normalized) for pressure vessel
I was basically looking for material with similar properties to the x70, that WOULD be allowable under section 8. I thought the 516-70N had similar properties to the x-70.
What we DONT want is to end up with a 2" thick shell on these vessels if we can avoid it.
If I can provide additional info, I will be glad to. Thanks for the help so far.
RE: X70 vs. 516-g70n (normalized) for pressure vessel
RE: X70 vs. 516-g70n (normalized) for pressure vessel
Are those fairly available plate materials?
RE: X70 vs. 516-g70n (normalized) for pressure vessel
RE: X70 vs. 516-g70n (normalized) for pressure vessel