Re: [MW:20408] PWHT AS PER ASME SEC-I

Hi,

It clearly states that as :Nominal thickness of Weld" It means the weld deposit/thickness. 

In your case its a Set-on type and weld deposit/thickness is 12mm only. So no need to do PWHT. 

 

Thanks & Regards,

(Karthik)

Karthikeyan.S

QA/QC Manager

German-Thai Boiler Engineering Cooperation Limited.

Rayong Factory ;

379 Moo.6 Soi 8, Tambol Pananikom,

Nikompattana, Rayong 21180 THAILAND

Tel : +66 38 897 035-9 Ext. 137

Fax : +66 38 897 034

Hand Phone: 0066 892512282

On Saturday, March 22, 2014 7:49 PM, "rajesh s. mhaske ,Engineer Welding ,PUNE,INDIA" <rajesh.mhaske17@gmail.com> wrote:

Dear sir
          ASME SEC-I ,PW-39

2)when the nominal thickness of a weld as defined in PW-39.4 is greater than % in. (19 mm) but does not exceed 1 % in. (38 mm), and:

(a) the calculated carbon equivalent, CE, of any of the basemetals in the weld joint is less than or equal to 0.45, using the formula :

                               CE = C + (Mn + Si)/6 + (Cr + Mo v)/S + (Ni + CU)/15

Can I use above clause of ASME SEC-I ,PW-39 to following welding to eliminate the PWHT of  membrane panel header

1. Item : Membrane Panel
2. Material : SA106 Gr B and SA210 Gr A1
3. OD and thk : 273 *35 header,panel tube : 50.8*6.35 thk
4. Joint type : Groove +Fillet
5. Weld deposition : 12 mm
6. No of Tube : 35 nos
7. CE : less than 0.45
8. preheat : 100 deg C
9. boiler type : CFBC
   

  plz suggest

Regards

Rajesh S Mhaske

Engineer Welding,CSWIP3.1,ASNT Level-II

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