3 - Hdpe - Itp Pipe Welding.docx

COMACOE FIELD INSPECTION AND TEST PLAN FOR HDPE PIPE WELDING OWNER:THERMAL POWER TECH CORPORATION INDIA LTD

CUSTOMER : GAYATRI PROJECTS LIMITED PROJECT : 2X660 MW TPCIL PH# 1, 2X660 MW, Thermal Power Plant at Krishnapatnam, Andhra Pradesh, India PACKAGE/SYSTEM : SWIO HDPE PIPE WELDING. SL.NO 1.

DESCRIPTION OF ITEM/OPERATION /STAGE HDPE Pipes & fittings incoming inspection

2.

Trial welding

3.

Production Welding of Pipe to Pipe and Pipe to stub end .

CHARACTERISTICS Surface finish of pipes& fittings at the stock yard on receipt from supplier

Drag Force, temperatures, time periods, welding pressure

a Ovality adjustment prior to welding

TYPE/ METHOD OF CHECK Visual & Measurement

EXTENT OF CHECK 100%

Recording of weld parameters

100%

Manufacturers catalogue, Preliminary WPS

measurement

100%

Inspection report

REFERENCE DOCUMENTS ISO 4427 & specification

b Drag force Visual & measurements

100%

Approved trail welding procedure, Machine catalogue.

ACCEPTANCE NORMS

FORMAT OF RECORD Inspection report

FITP NO : QAPC/CM110809060104 REV.NO : 03 DATE : 08.12.2011

COMACOE

GPL

TPCIL

P

W

W

Weld log sheet

p

W

W

Comparison of data logger & manual recording of parameters.

Shall Not more than ± 10% of wall thickness

Manual Weld log

p

W

RW

Field observation.

Not more than of welding pressure for one weld.

Weld Log sheet & Inspection report and M/c data log sheet

P

W

RW

Cuts and transportation damages not more than 10% of wall thickness. Adherence to welding parameter ranges.

REMARKS

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c Temperature of hot plate

d Welding parameters for heating time, soaking time, mirror removal time, ramp time, cooling time. 4.

5.

6.

Compilation of data logger reports and manually Recorded reports of welding parameters Finished bead quality (Inside)

Hydro test of Proto type as per the sketch attached, as decided in MOM dated 5th Dec 2011

COMACOE

Bead width, height, work manship

Pressure test at 3 Bar gauge pressure with water

Visual & measurements

100%

Approved welding procedure

Visual & verification

100%

Approved welding procedure

verification

100%

Approved trail welding procedure

Visual measurements

Random welds

As per the Pipe manufacturers recommendatio ns& approval trail welding procedures Hydro test procedure

visual

2 Proto type samples , one for each season

GPL-EPC-PP

210 ± 10° C.

Trail welding log sheet

Approved trail welding procedure

No leakage

P

W

RW

Measurement to be made with calibrated digital pyrometer

P

W

RW

Both manual and data logged reports.

P

V

V

Review of records.

Inspection report

P

w

w

Hydro test Report

P

H

H

Manual Weld Log & and M/c data log sheet Weld Log & Inspection report and M/c data log sheet Weld report

TPCIL

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