Material of Construction for -46 deg C

[rkdpv]

Hello

Design Conditions:
Design Temperature: 65 C/-46 C
Design Pressure : 20 Kg/cm2 and Full Vacume
Service: Propane

Please suggest whether we can use SA 516 Gr 55 or not.
Please suggest any other cost effective material for this condition.

Thanks in advance

 

[eliebl]

Provided the material is normalized there should not be much of a concern. Be sure to address the need for production impact tests as well as impact tested weld procedures. This is on the assumption that you are building to ASME Section VIII - Div 1.

In my area of the world SA 516 Gr 70 is much more common. That would permit a thinner vessel than the use of SA-516 Gr 55.

My 2 Cents.
EJL

 

[nashof]

rkdpv,
You should check with ASME VIII Div.1 (with the assumption you're talking about pressure vessel).
In UCS-66 you can check, because it depends of the thickness.
For 20 kg/cm2 I think your thickness will be more than 15mm (of course it depends on the dimensions on the vessel..) so you will be below Curve C (For not normalized 516 Gr55) and below Curve D (For normalized 516 Gr55).
This means you can use both materials, but you will need impact test.