How to calculate PWHT soaking time as per ASME Section 8.

ASME Sec 8 Div 1
PROCEDURE FOR PWHT -UW40
REQIREMENTS FOR PWHT -UCS56
Requirement of Pwht
UCS-56(D)(2)Heating Rate-222°C/Hr divided by Nominal Thick(Inches).
UCS-56(d)(2)Heating-140°C @4.6m Interval
UCS-56(d)(3) Soaking-83°C b/w the hottest & Coldest
UCS-56(d)(4)-Avoid Excessive Oxidation
UW-40(a)(2)-Min Overlap-1.5m
UCS-56(d)(5)Cooling rate Rate-280°C/Hr divided by Nominal Thick (Inches).
UCS-56(d)(5)After can be cooled in the still air
Mandatory under following condition:
For welded joints over 38mm nominal thickness
For joints over 32mm nominal thickness to 38mm thickness unless no preheat is applied at a minimum temp of 95C.
For all thickness of weld when imposed by service restrictions(UW2)
UW 2
a) Based on the requirement of UW-2(a) when our service is lethal and our material is carbon steel or low alloy steel.
b) Based on the requirement of UW-2(c) when our pressure vessel is unfired steam boiler and our material is carbon steel or low alloy steel.
c) Based on the requirement of UW-2(d) when our pressure vessel is subjected to direct firing and our material is carbon steel or low alloy steel.
How to calculate PWHT
Eg. Nominal Thickness of Pressure Vessel is 65mm.
As per table UCS 56-1 Hr /Inch Upto 2” & over
2” additional 15 minutes for every inch.
For 50mm-120Minutes
For 15mm-9 Minutes
Total Soak Time=129 Minutes.
#PWHT #Welding #Heating #ASME #Section9 #P_Number #UCS56 #Calculation
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[@manojr2282]

Very nice explanation and the most awaited one👍

[@vysakhnamboodiri9675]

Very much useful very simple explanation. Thank you. Please continue to make videos like this. 👍👍🤘🤘

[@navedanjum6257]

Very informative sir, please make more videos, thanks for uploading the video

[@humenbot24]

gr8 video.

[@carlosv9651]

great presentation

[@karthikbanari]

Add more videos..You are awesome!!..

[@sivakumarkolusu2706]

Excellent Presentation Sir

[@awstalib6213]

Thanks and well done

[@nehalthakkar5136]

Very good

[@mangeram2731]

Great thanks Sir

[@mangeram2731]

Thanks sir ji

[@atulkumarsingh3683]

Nice video

[@shubhambansode6929]

Very nice information Sir Thank you

[@shika-ri]

Sir , doubt , What I uderstansd is if material is preheated for thickness between 32 mm to 38 mm then pwht is not required , unless UW 2 applies , Am i correct.

[@faizali5302]

sir how do you calculate for " 15 mm - 9 Minutes" ?

[@veeraa9829]

My vessel SA516 GR 70, shell 22 thk, medium : ethanol ,For this case PWHT is required...?

[@weldinginspectionndt7376]

Refer NACE RP 0472

[@kabeershamsudeen6850]

how got 9 minute for 15mm?

[@nehalthakkar5136]

15 mins for additional inch(25.4mm)hence for 15 mm thickness = 25.4 mm thickness 15 min Then for 15mm how much? 15*15=225 / 25.4 = 8.85 then 9 mins

[@shaikazmatullah9679]

how did you calculate 15mm for 9 min kindly explain

[@pradeepreddy8651]

For upto 2" 2hrs + 15 min Our thickness 65mm Upto 2" ( 50.8mm) 2hrs Remaining thickness (14.2mm) As per condition over 2" Every 1" 15 minutes 1 minute =0.59mm 14.2*0.59 =9 minutes approximately Total 2hrs 9minutes

[@nehalthakkar5136]

Here is the calculation which is given by pradeep

[@mateoaguado8458]

The calculation should be: 15minutes / 25.4mm = .59055 then multiply by 15mm = 8.858 or 9minutes

[@nawfali]

دا انكليزي يا مرسي!