PQR - Low Temperature Carbon Steel (LTCS)

PQR - Low Temperature Carbon Steel (LTCS)

Code: ASME BPVC Section IX

For welding of ASTM A333 Gr.6 and related (Flanges and fittings) 

1. You have to qualify the PQR with P1G1 to P1G2 only.

This will qualify all the combinations of group numbers.  (The ASME interpretation is attached for your reference.)

2. You can do the PQR on plate with P1G1 to P2G2
(A516 Gr 70 (P1G2) to IS 2062 Gr B (P1G1))

3. Position should be 3G. (In piping 5G or 6G can be followed) Refer QW-405.2

4. Minimum thickness limits are as per QW-403.6

(Suggestion: PQR 1 : 6mm plate to plate, GTAW; PQR 2: 6mm Plate to Plate: GTAW+SMAW or SMAW only; PQR 3: 10mm Plate to Plate GTAW+SMAW) these 3 PQR will give a range from 3mm to 16mm of base  material thickness.)

5. For Maximum thickness limits,if your construction code is ASME B 31.3, you have to limit your maximum qualified thickness as per Table 323.3.1

Materials belongs to P1G1 are as below.

ASTM A 350 GrLF2 CL1 (P1G2)

Materials belongs to P1G2 are as below.

ASTM A 333 GR.6, ASTM A671 GR.CC60 CL.32, ASTM A 420 GR.WPL6, ASTM A 420 GR.WPL6-W

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