simulated PWHT cycles for deaerator

[AhmedHesham]

iam a QC engineer for fabrication company of pressure vessels. there is a new order for A deaerator construction and have the note at the photo attached . i want to know what is meant y 2 cycles required for production and total of 4 additional PWHT cycles and the role of several cycles of PWHT

 

[EdStainless]

Since not all of the welds can be done at the same time it is common to do part of the fabrication and then PWHT, and then do the rest of the welding and PWHT again.
Original fabrication will require two PWHT cycles.
If any repair or rework is needed you could end up doing another two cycles.
I am a bit confused by the wording of this, bad translation?
I believe that instead of saying "a total of 4 additional PWHT cycles" it should say "a total of 4 PWHT cycles".
But you need to verify that with the purchaser.

 

[weldstan]

They also require full mechanical testing at the 2 simulated cycles and after 4 simulated cycles and reported on the MTR.

 

[DekDee]

Is this for Sour Service application ?