API 570 EXAM STUDY GUIDE [MODULE 9 : PART 5] ASME B31.3

API 570 EXAM STUDY GUIDE

MODULE 9 : PART 5
ASME B31.3 : PROCESS PIPING

Continuation from previous blog,

S = Stress value for material.

‘S’ from Table A-1 or Table A-1M

SI units are given in Table A-1M, in that Stress is given in MPa for temperatures in degrees Celsius.

The second table given here is a continuation of first table in terms of rows.

Example : Line 10 : A106 Grade A: 

From first table: 

1. P no: 1
2. Min. Temp in Degree Celsius : Cure B in Figure 323.2.2A(This we will discuss)
3. Minimum tensile strength : 331MPa
4. Minimum Yield Strength : 207MPa
5. Max. use temperature : 593 Deg. C

From Second Table Corresponding to Line 10, stress values at different temperatures can be obtained.

Question and Answers:

Question: 1

A straight pipe is made of ASTM A106 Gr B material and the design temperature is 300 Deg.C. What will be the basic allowable stress in tension?

Answer:

In Table A-1M, ASTM A106 Gr B material is in Row number 31.

So the stress value is 126MPa

Question: 2

A straight pipe is made of ASTM A106 Gr B material and the design temperature is 600 Deg.C. What will be the basic allowable stress in tension?

Answer:

In Table A-1M, ASTM A106 Gr B material is in Row number 31.

ASTM A106 Gr B can be used maximum up to a temperature of 593Deg C only as per the table.

IN the next blog we will go through Figure 323.2.2A