PQR for LTCS Flange A350 Gr LF2 1

[DeepuDivakaran]

Dear Experts,

Your valuable comments are sought for the below mentioned issue.

One of our piping project which has to completed during plant S/D duration, there is shortage of 2 nos of 12" RTJ A105 WN Flanges. It is not for low temperature service. The connecting pipe is A106 Gr.B.
We have 2 nos of 12" RTJ A350 Gr LF2 Flanges. Whether I can use the same in place A105 with client approval and whether I need impact tested PQR to join the LF2 Flange to A106 pipe, mentioned the service requirement is not low temperature.

 

[weldstan]

Whereas the design stated does not require impact testing, you may use the A350 LF2 flanges in lieu of A-105 flanges without qualifying an impact tested PQR.

 

[Dhurjati Sen]

Dear DeepuDivakaran,

There is a 10 HB hardness difference between the two specs. So check if there is any maximum hardness specified for your piping and ensure you adhere to it for the ASTM A 350 LF2 flange and ASTM A 106 Gr B pipe weld joint.

Regards.

DHURJATI SEN
Kolkata, India