material grade information

[bigcease26]

thread794-152254

Hi , We are trying to get the Manway flange face of our 50T pressure vessel machined and to make sure we will be within/above, the minimum thickness after machining we want to initially carry out a calculation to determine the minimum thickness. The problem is the design data on the drawing of the pressure vessel says its a BS1501-151-grade C material spec. The service provider does not have any record of this spec and I cant seem to see any info on the net.

Can someone help? Could the info on the drawing be wrong and there is no BS1501-151-grade C? Is this spec known by any other spec? is there an equivalent if this does not exist anymore?

Charles

 

[r6155]

See PD 5500:2018

Regards

 

[DriveMeNuts]

PD 5500 only mentions Type A and B.
Type A and B are identical alloys.
Type A guarantees properties at ambient temperature.
Type B is the same as Type A with additional guarantee of elevated temperature properties.

I can't think what type C would be for. Low Temperature?