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PROCEDURE FOR CALIBRATION OF EQUIPMENTSPROJECT370 MW GAS BASED COMBINED CYCLE POWER PROJECT AT UTRAN,DIST.SURAT,GUJARAT

OWNERALSTOM PROJECTS INDIA LIMITED

CONSULTANTDESEIN PRIVATE LIMITED

CONTRACTORU.B.ENGINEERING LIMITED

REVDATEPREPARED

FOR UBELAPPROVED FOR UBELREVIEWED FOR APILAPPROVED

FOR APIL

A

24/05/08

TABLE OF CONTENTS

1.0 PURPOSE

2.0SCOPE

3.0REFERENCES

4.0RESPONSIBILITIES

5.0METHODOLOGY

1.0 PURPOSEThe purpose of this procedure is to lay guidelines and requirements and to establish a method of the EQUIPMENT & INSTRUMENT CALIBRATION at 370 MW BASED COMBINED CYCLE POWER PROJECT AT UTRAN CONSTRUCTED BY U.B.ENGINEERING LTD.2.0 SCOPE

The scope covers the minimum requirements to ensure the proper calibration procedure to identify the efficiency of equipment/instrument. That helps to ensure Quality in the CONSTRUCTION OF 370MW GAS BASED COMBINED CYCLE POWER PROJECT-UTRAN3.0 REFERENCE DOCUMENTALSTOM approved work procedure.4.0 RESPONSIBILITY

4.1 Project Manager / Q.C.In charge shall be responsible to establish, maintain and review the procedure.

4.2 Q.C. Engineer shall be responsible for effective implementation of this procedure at site.4.3 It is a responsibility of the Project Manager to fulfill all the requirements

To conform this procedure on working area. 5.0 METHOD

PRECALIBRATION REQUIREMENT: Visually check for damage

LIST OF EQUIPMENTS REQUIRED TO CALIBRATE:

Manual welding m/c, Semi Automatic & Automatic welding machine used used for GMAW, MMAW, GTAW, SAW & ESW welding. Calibrated shunt/Clamp Meter

Calibrated Voltmeter

Calibrated Stopwatch

Calibrated measuring scale/tape.

Variable DC Power Source.

Calibrated mV Source/Sink meter.

5.1 PROCEDURE

Current Calibration Actual current (in the welding range) is measured with the help of Tong Tester.

Actual readings then compared with machine meter readings.

OR The m/c Ammeter may be calibrated separately by injecting mV.

This difference in displayed & actual current corresponding to injected mV is noted.

Voltage Calibration: The voltage of the welding machine may be calibrated under both running and cold condition.

In running condition, actual voltage displayed during welding by machine is required to compare with calibrated voltmeter & deviations if any are recorded.

In cold condition the voltmeter shall be calibrated as per Calibrated Work Instruction ALSTOM DOC. NO.: DQX7601-QMF06

MACHINE SPEED CALIBRATION:

The machine speed is first preset to a particular speed value. With the help of calibrated stop watch & calibrated measuring scale, the actual displacement of a point in a given time is required to note.

Actual speed is calculated by dividing displacement by time & this speed is compared to the preset speed value as displayed by speedometer. The process is repeated at different speed settings.

5.2 ACCEPTANCE STANDARD:

Permissible error that can be tolerated in the working zone shall be as follows.

For Ammeter : within 10%

For Voltmeter : Within 2 volt

For Speedometer: Within 1inch/min.

5.3 CALIBRATION FREQUENCY:

The frequency of calibration should be as per DUE DATE mentioned in Calibration Certificate.

In case of DUE DATE not mentioned in Calibration Certificate it should be of 1 Year.

In case of any error/breakdown is suspected Calibration will be done on the bases of whichever is earlier.

5.4 RECORDS/RETENTION PERIOD:

Records of Calibration shall be done as per ALSTOM approved formats & is required to update as per due date of instrument. Every calibrated instrument should have a sticker on it with Calibration Date, Due Date, Calibration Reference no. & Sr. No.