Welding after PWHT on SA335 P11 coil
Makrand Sakpal
Dears,
We have ordered fired heater in which coil material is SA335 P11. Coil size is 6” x SCH 40 (i.e. 6.625” OD x 0.28” THK). These coils are PWHT’d. Issue is, our vendor forgot to weld the thermocouple RF pads on the coil before PWHT. What needs to be done further if we weld the RF Pads on the already PWHT’d coils? Do we need to do PWHT again for that particular joint?
Please let us know your opinions.
Hareesh K V
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jitendra raghuwanshi
Makrand Sakpal
Kannayeram Gnanapandithan
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Thompson, Dennis
Per Table UCD-56-4 of Section VIII, Division 1 of the ASME BPVC (for ASME P-No. 4 steels):
1. For butt welds in pressure barriers, PWHT is required for thicknesses greater than 5/8-inch (16-mm)
2. For non-pressure attachment fillet welds, PWHT is required for thicknesses greater than 1/2-inch (13-mm)
Per Table 132.2 of ASME B31.1 (for ASME P-No. 4 steels):
1. For butt, groove, & socket welds in pressure barriers, PWHT is required for pipe thicknesses greater than 5/8-inch (16-mm)
2. For non-pressure attachment fillet welds, PWHT is required for pipe thicknesses greater than 5/8-inch and fillet throat thicknesses greater than 1/2-inch (13-mm)
Per Table 132.2 of ASME B31.3 (for ASME P-No. 4 steels):
1. For butt, groove, & socket welds in pressure barriers, PWHT is required for pipe thicknesses greater than 5/8-inch (16-mm)
2. For non-pressure attachment fillet welds, PWHT is required for pipe thicknesses greater than 5/8-inch and fillet throat thicknesses greater than 1/2-inch (13-mm)
D. Thompson
From: material...@googlegroups.com [mailto:material...@googlegroups.com]
On Behalf Of jitendra raghuwanshi
Sent: Thursday, November 23, 2017 5:49 AM
To: material...@googlegroups.com
Subject: Re: [MW:27045] Welding after PWHT on SA335 P11 coil
As per my knowledege alloy materials of grade P11 & P12 doesnt require pwht if thickness is less than 13mm.
On 22 Nov 2017 5:28 pm, "Hareesh K V" <haree...@gmail.com> wrote:
Sir,
With proper approvals and procedure you can go for local PWHT.
Regards,
Hareesh K V
On Nov 22, 2017 5:11 PM, "Makrand Sakpal" <makr...@gmail.com> wrote:
Dears,
We have ordered fired heater in which coil material is SA335 P11. Coil size is 6” x SCH 40 (i.e. 6.625” OD x 0.28” THK). These coils are PWHT’d. Issue is, our vendor forgot to weld the thermocouple RF pads on the coil before PWHT. What needs to be done further if we weld the RF Pads on the already PWHT’d coils? Do we need to do PWHT again for that particular joint?
Please let us know your opinions.
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NISARG KEDAR
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Makrand Sakpal
ASME SEC II Part A, Specification SA-335/SA-335M, Clause 5.3.1 says “All pipe shall be reheated for heat treatment and heat treated in accordance with the requirements of Table 2”. Per Table 2, grade P11 shall be Normalized & Tempered @ 650°C. Also note 4 given just below clause 5.3.1 says “Certain of the ferritic steels covered by this specification will harden if cooled rapidly from above their critical temperature. Some will air harden, that is, become hardened to an undesirable degree when cooled in air from high temperatures. Therefore, operations involving heating such steels above their critical temperatures, such as welding, flanging, and hot bending, should be followed by suitable heat treatment”.
Does "Certain of the ferritic steels" covers grade P11?On Wednesday, 22 November 2017 17:11:49 UTC+5:30, Makrand Sakpal wrote:
