Different between PW-28.1.2 and UW-28(c)

[RAGER]

What different between ASME SEC I PW-28.1.2 and SEC VIII-1 UW-28(c)?

i.e., Should we need WPS/PQR,when we weld a insulation support pins on a VIII-1 vessel?

Thank you for any help you can offer!

 

[Cobra17]

see UW-28(c)

(c) The procedure used in welding non-pressurebearing
attachments which have essentially no loadcarrying
function (such as extended heat transfer surfaces,
insulation support pins, etc.), to pressure parts shall
meet the following requirements.
(1) When the welding process is manual, machine, or
semiautomatic, procedure qualification is required in accordance
with Section IX.
(2) When the welding is any automatic welding process
performed in accordance with a Welding Procedure
Specification (in compliance with Section IX as far as applicable),
procedure qualification testing is not required.

 

[RAGER]

Dear Cobra17

see UW-28(c)
(c) The procedure ....
(1) When the welding process is manual, ....
Yes,Weld a insulation support pins on vessel is manual.
(2) When the welding is ....
Weld a insulation support pins on vessel is not automatic welding process.

see PW-28.1.2
Except as provided in (a) and (b), the
Welding Procedure Specification, the welders and the
welding operators used in welding nonpressure-
bearing attachments which have essentially no load-
carryingfunction(such as extended heattransfer surfaces,
insulation support pins, etc.) to pressure parts shall be
qualified in accordance with Section IX. Possession of a
Certificate of Authorization by the organization
performing such welding is neither required nor prohib-
ited.
(a) When the welding process is automatic, ....
(b) When the material used for the nonpressure part
makes the mechanical test requirements for procedure
qualification and performance qualifications impractic-
able (i.e., insufficient material ductility), a weld test
coupon may be evaluated using the macro-examination
method for both groove and fillet welds. The test
coupon may be of production configuration and shall
be of sufficient length to contain a specimen for
macro-examination. One face of the cross-section shall
Should we follow this requirement?

 

[Cobra17]

since it's a VIII-1 vessel, don't look at section I requirements, they don't apply.