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Reduction in Impact test temperature for sub size specimen B31.3

Reduction in Impact test temperature for sub size specimen B31.3

Reduction in Impact test temperature for sub size specimen B31.3

Dear All,
I have SA 333 Gr.6 2" x 5.54mm PQR coupon supposed to be impact tested at -50Deg.C asper piping service class.

The specimen size is 10mm X 3.33 mm


As per B31.3 Table 323.3.4 and Clause 323.3.4(b) , i calculated the impact test temperature as -60.3 Deg.C .Please correct me if i am wrong as my mother toungue is not english, i am having a hard time to interpret the clause

My calculations as below

Actual wall thickness = 5.54 mm
Impact Specimen Width Along Notch = 3.33

So the ratio is (3.33/5.54 ) X 100 = 60.1% which is less than 80%

Now refer Table table 323.3.4 to find the temperature reduction for 5.54mm

1. Temperature reduction for 6mm = 8.3 Deg.C
2. Temperature Reduction for 5mm = 11.1 Deg.C
3. Temperature reduction for 5.54mm = (8.3*2)/3 + (11.1*1)/3 = 9.33 Deg.C (Refer Note of table 323.3.4 Straight line interpolation for intermediate values is permitted)

Temperature reduction for 3.33mm (asper PQR Impact test specimen ) from table = 19.4 Deg.C

We have to take the difference

Ie, 19.4 - 9.33 = 10.07 Deg.C

We have to minimum this value from the actual requirement which is -50Deg.C

50+10.07 = -60.07 Deg.C

RE: Reduction in Impact test temperature for sub size specimen B31.3

It appears to be a reasonable calculation.

Steve Jones
Corrosion Management Consultant


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