OFFSHORE PIPELINE CONSTRUCTION PHASE Pipe Laying : Normal S-Laying Method

OFFSHORE PIPE LAYING: Normal S-Laying Method

Step 1: PIPE BEVELING Lift the pipe out of the supply barge onto the incoming rack Pipe Tallying (pipe number, length, joint number) Making the J-Bevel on pipe ends for Auto welding

Step 2: Station 1 (Fit up, Root and Hot Pass) Preheat on pipe end prior to welding (based on approved WPS) Fitting pipe ends to be aligned by means of internal clamp Root weld followed by Hot pass

Step 3: Station 2,3,4&5 Filler passes on Station 2 and 3 Cap welding on Station 4 Visual Inspection on Station 5 Sta #4 Sta #2 Sta #5 Sta #3

Step 4: Station 6 (X-Ray) X-ray operators control the movement of the X-ray crawler inside the pipe Radiographic intrepeters from HHI, Client and Migas are reviewing the X-ray result Wrapping the film around the intended joint

Step 5: Station 7& 8 (Brush up and Cold Wrap) Sta #7: Brush up Sta #8: Cold Wrap

Step 6: Station 9 (FIELD JOINT COATING) & PULLING Foam Coating performed by OJS (Offshore Joints Service)

WELDING

X - Ray

Coating

Laying

HD 423 Laying

HD 423 LINE PIPE ON SEA BED

How the Barge Moves P5 P4 P2 P1 S1 S5 S4 S2

P5 P4 P2 P1 S1 S5 S4 S2

P5 S5 P5 S5 P4 S4 P2 P1 S1 S2

P5 S5 P4 S4 P4 S4 P2 P1 S1 S2

P5 P4 P2 S2 P2 S2 P1 S1 S5 S4

P5 P4 P2 P1 S1 S5 S4 S2