In case Piping contractor or manufacturer who is possessing valid/qualified welding procedure specifications/qualification tests conducted as per ASME Sec IX for piping works, sub-lets the welding works by the way of sub-contracting to other agency, please clarify the requirements of welding procedure qualifications by the sub-contractor as per clause no: 328.1 of ASME B 31.3

If anyone possesing qualified ASME procedures subcontracts welding services at other companies, this subcontracted company must fullfil ASME reqs as well. The documentation of the ordering company may not be used.
In this case the subcontractor shall qualify his own welding documentation. He shall weld a test coupon, issue a PQR and WPS and qualify his welders as per ASME SEction IX.

Hope this helps!

kvc_eil,
The use of subcontractors can be done without any requirements for new PQR/WPS but under this provision.
Your company must maintain "responsible operational control" of the production welding.
See QW 100.1:
"Any WPS's used by a manufacturer
or contractor that will have responsible operational
control of production welding shall be a WPS that has
been qualified by that manufacturer or contractor in accordance
with Article II……"
You can bring subcontract welders into your workshop or you can put a supervisor in their workshop but as long as you are maintaining operational control you are OK.
Of course you would have to qualify the subcontactors welders to your WPS's,
Regards,
BB

I'll take a deep breath before taking this one step further.......:

328.2.2 Procedure Qualification by Others. Each
employer is responsible for qualifying any welding procedure
that personnel of the organization will use. Subject
to the specific approval of the Inspector, welding
procedures qualified by others may be used, provided
that the following conditions are met:
(a) The Inspector shall be satisfied that
(1) the proposed welding procedure specification
(WPS) has been prepared, qualified, and executed by a
responsible, recognized organization with expertise in
the field of welding
(2) the employer has not made any change in the
welding procedure
(b) The base material P-Number is either 1, 3, 4 Gr.
No. 1 (11⁄4 Cr max.), or 8; and impact testing is not
required.
(c) The base metals to be joined are of the same
P-Number, except that P-Nos. 1, 3, and 4 Gr. No. 1 may
be welded to each other as permitted by Section IX.
(d) The material to be welded is not more than 19 mm
(3⁄4 in.) in thickness. Postweld heat treatment shall not
be required.
(e) The design pressure does not exceed the ASME
B16.5 Class 300 rating for the material at design temperature;
and the design temperature is in the range −29°C
to 399°C (−20°F to 750°F), inclusive.
(f) The welding process is SMAWor GTAWor a combination
thereof.
(g) Welding electrodes for the SMAW process are
selected from the following classifications:
AWS A5.11 AWS A5.41 AWS A5.51
E6010 E308-15, -16 E7010-A1
E6011 E308L-15, -16 E7018-A1
E7015 E309-15, -16 E8016-B1
E7016 E310-15, -16 E8018-B1
E7018 E-16-8-2-15, -16 E8015-B2L
E316-15, -16 E8016-B2
E316L-15, -16 E8018-B2
E347-15, -16 E8018-B2L
(h) By signature, the employer accepts responsibility
for both the WPS and the procedure qualification record
(PQR).
(i) The employer has at least one currently employed
welder or welding operator who, while in his/her
employ, has satisfactorily passed a performance qualification
test using the procedure and the P-Number material
specified in the WPS. The performance bend test
required by Section IX, QW-302 shall be used for this
purpose. Qualification by radiography is not acceptable.