PQR shall be tested in Min & Max PWHT (3 Cycle minimum simulation) condition.

[kunalen...@gmail.com]

Dear Sir's

Client has specified the requirement for testing the PQR in Min & Max PWHT (3 Cycle simulation) condition. As we had pre-qualified PQR with one cycle of 2 Hours soaking. So please suggest how to comply with the requirement & what does this "3 cycle simulation" exactly means?

Regards

Kunal Srivastava

[Vijay Katkar]

What is your governing thickness.?

Also specify design code.

Thank you 

Vijay Katkar 

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[Vijay Katkar]

Hi Kunal,

3 simulation cycle is required with considering future service repair.

You need to prove that after considering 3 simulation PWHT cycle the minimum tensile requirement can be achievable . But you need to check the base metal also, 

Is the base metal tested/qualified with 3 simulation cycle?

Thank you 

Vijay Katkar 

On Mon, 16 Dec 2019, 1:56 pm , <kunalen...@gmail.com> wrote:

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[Kiran Ekbote]

Dear Vijay,

The above query is related to me also, can you please explain in detail.

And I have qualified PQR, please refer to I have included the two different  PQR range. 

Material Both PQR  ASTM A106 Gr B

Thickness Range - 5 mm to 25 mm

First PQR Range - 

POST WELD HEAT TREATMENT( QW-407)
TEMPERATURE RANGE	630 ±10° C
SOAKING PERIOD	190Min
HEATING RATE	190°C/Hours Max
COOLING RATE	190°C/Hours Max

Second PQR Range - 

  TEMPERATURE RANGE TP1 - 638 ±10° C  TP2 - 635  ±10° C

 SOAKING PERIOD:  TP1 - 72 min  TP2 - 189 min 

 HEATING RATE:  TP1 -170°C/Hours and TP2-171°C

 COOLING RATE:  TP1- 163°C/Hours and TP2-106°C/h

But it is not clear to me how to confirm if mechanical properties are ok after just one PWHT ( for sure Tensile St. and Y. S. will be ok, since values are greater, but hardness test?

Please explain to me about the mechanical test and  3 cycles PWHT. Where I require test coupons for first PQR.

Thanks and Regards

Kiran

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KIRAN