PWHT THICKNESS REQUIREMENTS ASME SECTION VIII DIV 1

[Sumit bhadakwad]

Hello Everyone ,

I am new here but very sure that i will get my answers from experts.
I am confused between UCS-56(d)(1) through (5) term "maximum material thickness " & UW-40(f)(1) through (6).

I really want to clear both this term .

Actually we are manufactured base frame of size 15mx5mx3m in H beam of size 305x30x118x20thk and in which different plate thickness plates used to weld on base frame.in which 105 mm thk plate highest in thickness. & i want to make PWHT cycle include all things like.

unrestricted heating rate up to .
Heating rate of maximum :-
Holding temperature
Soaking Time :
Cooling rate of maximum:-
Unrestricted cooling rate from

 

[Sumit bhadakwad]

Hello 212197 ,

Its my mistake now i have taken below values & updated heating & cooling rate.

I have taken 105 max thk for heating & cooling rate as per ucs-56.

heating rate =53 DEGREE CEL/ h.

Cooling rate=68 DEGREE CEL/ h.

 

[212197]

it is practically not possible to follow above rate mentioned by u.
u need to follow heating & cooling rate mentioned in EIL specification which I have already shared.

 

[Sumit bhadakwad]

Hello 212197 ,

Ok but it is given in ucs-56 .

I have calculated as per given in standard , if it is not correct how to calculate it ?

 

[212197]

unlike soaking time,these are not to be calculated as code put only the max. limit.
u need to follow the already proven & generally followed heating & cooling rates.
As it is a regularly used material, no need of reinventing the wheel.

Had it been a seldom used material, rates would have been required to be calculated based on applicable code clauses.

 

[212197]

As your customer wants pwht as per sec. VIII Div 1, heating & cooling rate as per EIL u may not be able to follow.
So u can follow the calculated rates provided your furnace in-charge agrees to follow the calculated rated.

otherwise as mentioned in my first reply, 50 degree cel /hr is ok which is proven & complies with UCS 56.

 

[r6155]

212197- Standard EIL (Engineering India Limited)is for plates, not for welds.

Regards

 

[212197]

The standard is applicable to weld.
The raw material i.e. plate shall undergo simulated heat treatment when in actual job it will undergo heat treatment.
So in actual job the plate will be undergoing heat treatment along with weld.
Hence same cycle is applicable to weld as well as plate.

 

[r6155]

a)Simulation HT of plate: use thickness of plate

b)PWHT of actual job: use the maximum fillet throat of the job.

a) and b) are not the same cycle.

Regards

 

[Sumit bhadakwad]

Hello Everyone thanks a lot for helping me.

 

[212197]

r6155 (Mechanical),

in case referred by Sumit,nominal thickness to decide soaking time = 53 mm.
soaking time is 120+(15X3/25)= 130 (ROUNDED OFF)....calculated based on TABLE UCS-56-1 FOR PWHT

as per attached EIL spec of plate.,minimum 1 hour per 25 mm as soaking time for simulated cycle.
so for 53 mm, as per EIL spec. soaking time will be 120 min. + (53x60/25) = approximately 130 min.



hence a & b in this case are almost same.

 

[r6155]

@ 212197
a)Simulation HT of plate: use thickness of plate
Thickness of plate= 105 mm (not fillet weld).

Regards

 

[212197]

r6155 (Mechanical)

Sumit did not want cycle for simulated HT.
He Wanted cycle for PWHT.
I have an authentic EIL document indicating cycle for relevant material which gives cycle for P1 material but it is simulated HT.
Sumit needs to apply same cycle for PWHT.

As he is not looking for simulated HT,105 mm thk. of plate is not a concern.
Cycle has to be worked out based on 53 mm which is a throat.

So in this case, simulated cycle given in EIL spec. can be applied for PWHT.