WPS helping tips

Dear All,

We are preapring a WPS for plugging purpose of U-bendle heat exchnager type DXU due to some leakage in tubes during hydrotest. please find details as under:

Tube: A 210 Gr A-1 (OD x t 20mmx3.5)

TubeSheet: A 285 GrC (Thick 280mm)

Plug (Tapered): A 322 Gr1335

Tube side pressure & Temp. : 255kg/cm2g @ 117Degree Celcius

now problem is that as per UCS-56 PWHT is not mandatory if fillet weld with throat thickness does not exceed 13mm, tube OD 2inch and Carbon Content 0.22% respectively.

Q: However, In our case only problem is that only carbon content is exceeding from 0.22% while other requisite are qualifying all requirements as per UCS-56 (c) (2). Is PWHT is required or not?

your urgent resposne to the above is highly appreciated.