Dodsal Pte LtdQ-Chem Ethylene ProjectDoha, QatarJob No : 7979/G2/010 WELDING PROCEDURE SPECIFICATION

1 7979/WPS/PP/47 Rev.0 Date:29-10-01 Supporting PQR : PQR-11716-02 1/10/1989

2 Joint Design Single "V" Groove Joint Design

3 Backing None 37.5° ± 2.5°

4 Joint Prep. Machining and/or Grinding

5 Base Metal Spec. P43 To P43 T

6 Base Metal SB-167 N06600,SB-564 N06600 2-4mm 1.6mm +0.8mm

7 Pipe Dia Range All -0.0mm

8 Thickness Range 1.6mm to 6.75mm

9 Process GTAW

10 Type Manual

11 F.No 43 1.6mm +0.8mm

12 A.No - 37.5°±2.5° -0.0mm

13 S.F.A No. 5.14

14 AWS No. ER Ni Cr-3 T 2-4mm

T

15 Flux N.A. Maxinum Misalignment as

16 Insert N.A. per PFI Standard

17 Position Of Groove All 18 Progression Vertical Uphill

19 Pre Heat Temp Range 10°C Minimum 20 Interpass Temp. 150°C Max.

21 PWHT Temp. Range N.A. 22 Time Range N.A.

23 Shielding Gas & % Comp Argon 99.99% purity 24 Flow Rate Shielding 20-30 CFH

Purging 20-35 CFH

25 Purging Argon 99.99% purity 26 Trailling Gas Cup Size N.A.

27 Tungsten Type : 2% Thoriated Size Dia 2.4mm 28 Orifice or Gas Cup Size 8-13mm

29 Wire Feed Speed N.A. 30 Mode Of Metal Transfer N.A.

31 Contact Tube to Work Distance N.A. 32 Oscillations N.A.

33 No. of Electrodes/ Filler Wire Single 34 String & Weave String & Weave

35 Number of Passes (per side) Multiple 36 Peening Not Allowed

37 Initial/ interpass cleaning Grinding and or Brushing 38 Method of Gouging NA

39 Pre Heat Maintenance N.A 40

41 Weave width not to exceed 10mm

Pass Process Polarity Weld Filler Metal Amps Volts Speed Remarks

No. Direction AWS No. Dia mm/min

Root GTAW DCEN UPHILL ER Ni Cr-3 2.0/2.4 60-90 8-12 35-55

Hot GTAW DCEN UPHILL ER Ni Cr-3 2.0/2.4 60-90 8-12 50-75

Cap GTAW DCEN UPHILL ER Ni Cr-3 2.0/2.4 60-90 8-12 60-90

Notes :

COMPANY DODSAL Pte Ltd. APPROVED BY KBRTSIGNATURENAME Shrikant Ajgaonkar

DATE 10/29/2001

Format No : DOD/Q-Chem/F082 Rev 0c:\DIR00001\wps\pp47.xls