Not required
Regards
Vinayak Kale
OGSP - QA & I , HC - Upstream
EPC Block , 2nd Floor , Gate No.1
Saki Vihar Rd. Powai Campus
Mumbai - 400072
Ph : + 91 022 6705 3969
(M) - 9987875309
www.larsen toubro.com
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| From: | deva m <devmunch@gmail.com> | |
| To: | materials-welding@googlegroups.com | |
| Sent by: | materials-welding@googlegroups.com | |
| Please respond to materials-welding@googlegroups.com |
Dear sir,
When the given specification is not recommending the thickness range,then it can be waived off...
On Tue, Jun 5, 2012 at 10:13 AM, perumal govindan <perumalgovindan@gmail.com> wrote:
Dear Experts,
Please clarify the below mentioned particulars,
we have carried out a SDSS PQR with 12" Dia. x 8.38mm thick, matl.
grade: ASTM A 928 Cl.1 (UNS S32760), thickness qualified range: 8.38mm
to 16.76mm - carried out corrosion tests (like, pitting, crevice,
chloride stress and sulphide stress), all physical and chemical tests
are passed.
Hence for covering the thickness range, we have also carried out a PQR
with 4" Dia. x 3.05mm, matl. grade: ASTM A790 (UNS S32750), qualified
thickness range: 1.525mm to 6.1 mm. Here we got stuck up due to
Sulphide stress (test as per NACE TM-0177)and chloride stress (test as
per ASTM G-36) due to lower specimen thickness. As per NACE TM-0177
the minimum reqd. thickness for sulphide stress corrosion test is
3.81mm.
Now my PMC/Client is insisting to carry out the SSC corrosion test
also in 4" Dia. x 3.05mm PQR test coupon. (Filler wire used: ER 2594,
same batch & Lot Number used also in 12" Dia. x 8.38 mm)
Hence, kindly advise me that whether SSC test is required for the 4"
Dia. specimen or not.
Thanking You.
Govin
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