ASTM A352 LCB and LCC
ASTM A352 LCB and LCC
(OP)
Dear All,
Could somebody help me to undrestanding what is differences between Casting valve material ASTM A352 LCB and A352 LCC,
we request in our material requsition for casting valve body in Low Temperature ASTM A352 LCB while Vendor quotation offer ASTM A352 LCC, I realy could not find a rational reason for accepting or rejection?
Does anybody knows?
Could somebody help me to undrestanding what is differences between Casting valve material ASTM A352 LCB and A352 LCC,
we request in our material requsition for casting valve body in Low Temperature ASTM A352 LCB while Vendor quotation offer ASTM A352 LCC, I realy could not find a rational reason for accepting or rejection?
Does anybody knows?





RE: ASTM A352 LCB and LCC
RE: ASTM A352 LCB and LCC
RE: ASTM A352 LCB and LCC
As I know the size of allowable flaw is propotional K/(yeild)^2 and I think this might be problem in QA/QC besides the required energy for impact testing for LCC is slighly more than LCB in -29 C (20 instead 18).
What do you think?
RE: ASTM A352 LCB and LCC
We allways specify LCC to meet identical pressure/Temperature ratings (ASME B16.5) as for equavalent LF2 Cl.1 flange material.
LCB do have lower p/T limits than LF2.
Regards,
FKE
RE: ASTM A352 LCB and LCC
IMO the differences are not that significant as GRoberts points out. Despite the slight increase in YS, the notch toughness requirement is increased so I don't really see a problem regarding substitution.
RE: ASTM A352 LCB and LCC
Reason for rejection could, as far as I can see, only be the maximum design pressure of the pipe class, which is lower for LCB than LCC/LF2.
Is the valve API-6D, or API 602 or ASME B16.34?
In there are tables presented showing the maximum p/T limits per valve body material. These should fall within your limits of the applicable process design conditions (pipe class).
Regards,
FKE
RE: ASTM A352 LCB and LCC
Good point. However, in most service applications for valves the working pressures for a specific service temperature are normally well below the values in ASME B16.34 Table 2-1.2 and 2-1.3.