Presentation on

Accidents in Steel Gas Pipe Line

INDRAPRASTHA GAS LIMITED

1st Accident

Date: 1st June 2006 at 9.00 hrsTotal Hours of interruption: 648 Location : at Adchini junction Affected section of pipe line : Sarojini Nagar flyover to Laddo Sarai CNG StationAffected Length: 6.8 kmDiameter: 6’’Reason : 3rd party Damage( by D.K Enterprises on (contractor of BSES) during laying of cable).

Cause : Negligence of BSES, Reamer of HDD Machine hit steel line due to trenchless activities.

There was gas leakage. No. of CNG Stations affected: 1 No. of DTC Depot affected : 0 No. of R.O affected : 0 No. of FRS affected : 0

Date: 19th July 2006 at 12.30 hrs Total Hours of interruption: 154.3 Location : near Mukherjee Nagar drain Affected section of pipe line : Dheerpur

CNG Station to Chattersal CNG Station Affected Length: 7.8 km Diameter: 4" Reason : 3rd party Damage( by DDA

during construction of bridge)

2nd Accident

Cause : pipe line get punctured due to piling work, negligent effect of DDA authorities, securities had made aware about location prior to 4 days of damage.

There was gas leakage. No. of CNG Stations affected: 5 No. of DTC Depot affected :2 No. of R.O affected :1 No. of FRS affected :0

Date: 6th December 2006 at 12.40 hrs Location : Ghazipur Drain Crossing Total Hours of interruption: 257.2

Affected section of pipe line : Gail P/L TO Mayur Vihar PH-I CNG 

Affected Length: 0.6 km Diameter: 4" Reason :3rd party Damage (by Flood &

Irrigation Deptt due to rupture of IGL’’s pipe line).

3rd Accident

Cause : Due to Dredging work during cleaning of drain by JCB.

There was gas leakage. No. of CNG Stations affected:1 No. of DTC Depot affected :0 No. of R.O affected :0 No. of FRS affected :0 Remedies : The damaged portion was being

at the depth of approx 7 m inside the flowing drain. Repair was not possible at all.

For this an alternate line was passed.

Date: 14th May 2008 at 16.30 hrs Diameter: 4 Affected Length: 7.1 km Affected section of pipe line :S.V-4

(Gail) To Okhla PH-I CNG Station Total Hours of interruption: 17.5 Reason :3rd party Damage (by DJB)

4th Accident

Cause : Negligence of DJB during boring.

There was gas leakage. No. of CNG Stations affected:2 No. of DTC Depot affected :2 No. of R.O affected :1 No. of FRS affected :0

Date: 2th jan 2009 at 17.00 hrs Diameter: 4" Affected Length: 3.36 km Affected section of pipe line : SGTN-II

To Siddhu Petrol Pump Total Hours of interruption: 49.5 Reason : 3rd party damage (by PWD)

5th Accident

Cause: During building of flyover , pockline machine hit the steel pipe line.

Only Dent, no gas leakage. No. of CNG Stations affected: 3 No. of DTC Depot affected :1 No. of R.O affected :1 No. of FRS affected :0

Date: 9th June 2009 at 15.45 hrs Diameter: 6"&4" Affected Length: 28 km Affected section of pipe line :

Complete East Delhi Pipeline Section (S.V-1Ghazipur to Loni Road)

Total Hours of interruption: 11.45 Reason :3rd party Damage ( by PWD)

6th Accident

Cause : During building of flyover , Piling machine hit the steel pipe line.

No. of CNG Stations affected: 8 No. of DTC Depot affected :3 No. of R.O affected :6 No. of FRS affected :1

Date: 22th Aug 2009 at 9.15 hrs Diameter: 6“ Affected Length: 4.5 km Affected section of pipe line :T-Point

West Enclave to Rohini Mega CNG Station.

Total Hours of interruption: 218.45 Reason : : Uncontrolled Error ( Damage

by Power Cable)

7th Accident

Cause : High tension wire fell in the the Budhvihar drain and Surge pass to underlying steel pipe line.

No. of CNG Stations affected:1 No. of DTC Depot affected : 0 No. of R.O affected : 1 No. of FRS affected : 0

Date: 23th june 2010 at 16.30 hrs Total Hours of interruption: 26

Affected section of pipe line :Jassa Singh Park to Saksham Petrol Pump

Affected Length: 1.443km Diameter: 4" Reason : operational error ( by MDPE

Project )

8th Accident

Cause : There was a bend connecting 1 m pipe line to 3 m pipe line. Drawing was not checked and HDD reamer hit 3 m line joint.

No. of CNG Stations affected:0 No. of DTC Depot affected :0 No. of R.O affected :1 No. of FRS affected :0 Suggestions : Check through both

locator and drawing.

Date: 10th May 2011 at 14.00 hrs Diameter: 4” Affected Length: 1.4 km Affected section of pipe line : Kalka ji

DTC Depot to Okhla Ph-1 CNG station Total Hours of interruption: 82 Reason : operational error( improper

line laying practice)

9th Accident

Cause : Damage due to Corrosion/incorrect laying of pipeline in DJB valve chamber, pipe line rest over water line valve stem for 8 years and also due to differential aeration.

No. of CNG Stations affected:1 No. of DTC Depot affected :0 No. of R.O affected :0 No. of FRS affected :0

Date: 23th May 2012 at 0.00 hrs Location :Kapashera Chawk( Near

Police Station Diameter: 12" Affected Length: 2.8 km Total Hours of interruption: 32 Reason : 3rd party Damage( by BUCON

Reamer of HDD knocked already newly operational 12” line).

10th Accident

Cause: HDD Calibration was not correct. HDD was working on 4.5m instead of 5 m and till that date IGL don't have drawing. Locator gave incorrect reading.

There was gas leakage. No. of CNG Stations affected:1 No. of DTC Depot affected :0 No. of R.O affected :2 No. of FRS affected :0

Date: 28th Oct 2012 at 00.45 hrs Diameter: 4 Affected section of pipe line :Burari to

Chattrasal CNG Station Affected Length: 11.65 km Total Hours of interruption: 15.25 Reason : 3rd party Damage( by Model

Town Market Association).

11th Accident

During placing a tent there someone took a thick nail and hit the pipe line and there was gas leakage.

No. of CNG Stations affected:3 No. of DTC Depot affected :2 No. of R.O affected :3 No. of FRS affected :0

Date: 10th may 2013 at 7.30 hrs Diameter:4“ Affected section of pipe line : From Up-

Gate to Ashiram Batra R.O. Affected Length: 7.97 km Total Hours of interruption: 27.1 Reason :3rd party Damage (by Vishwa

Infra on the contract of DJB for laying of sewer line of dia 1.5 m).

12th Accident

Cause : Pipe Line was hit during laying of sever line by MTBM( Micro tunnel Boring Machine)

Information was not provided. No. of CNG Stations affected:3 No. of DTC Depot affected :2 No. of R.O affected :3 No. of FRS affected :0

Date: 2th Jan 2014 at 15.00 hrs Location : NH-24 CNG Station Diameter: 4" Affected Length: 6.4 km Total Hours of interruption: 20 Reason : Damage by Puncture of

dielectric material of Insulating Joint at NH-24 CNG station due to electric surge.

13th Accident

There was a fire at CNG station. High pressure leakage occurred. No. of CNG Stations affected:0 No. of DTC Depot affected :2 No. of R.O affected :3 No. of FRS affected :1

Date: 3th Feb 2014 at 17.50 hrs Location : Burari chawk Diameter: 4" Affected section of pipe line :Burari

chawk To Sai R.O. Affected Length: 0.6 km Reason :Operational error (by PWD

during construction of Mukarba Wazirabad elevated road)

14th Accident

Cause : Wrong offsets in drawing and locator couldn’t locate because of its depth(13 m)

according to drawing, offset of line was 11 m, clearance was provided to the contractor 17 m, piling activity was done at 23 m.

No. of CNG Stations affected:0 No. of DTC Depot affected:0 No. of R.O affected :2 No. of FRS affected :0 Findings : locator can’t locate below 5

m

Following are the reasons for the Damages:

3rd Party damage due to excavation by DTL, DDA, PWD, DJB etc.

Operational Errors like improper working of locator, not to check drawings etc.

Un controlled errors / time independent like puncture of dielectric material, due to electric surge.

Analysis Of Damages

Total no. of Damages : 14 No. Of Damages by 3rd Party Damage :

8 No. Of Damages due to Operational

errors : 4 No. Of damages due to un

controlled/time independent :2

Accidents in past

57%29%

14%

3rd Party DamageOperational Errorsuncontrolled/time independent

Reasons of Damages

To Rectify operational errors Calibration of the equipments to be done on

timely basis.( not followed till now) Check the certificates of HDD operator and

Tracker. All pipeline fittings and accessories should

be checked and operational life time of all should be decided.

Check drawings and locator both during the construction work.

Suggestions

Drawings should be properly checked by zonal in charge after laying of steel line by contractor.

The hydrostatically tested pipes should be retested by nitrogen gas before charging the line.

Protective measures from Electric installation( Neoprene sheets, RCC blocks, Minimum distance should be maintained).

Proper communication with BSES and other agencies.

Uncontrolled/Time independent error

Proper patrolling of pipeline by patrolling guard. Reporting by patrolling guard is very important,

train and test patrolling guard. Intimation should be given to the various

authorities like DJB , DTL, BSES, MCD, DDA, etc prior to construction work.

Depute IGL representative on 3rd party work specifically on HDD REAMER,PILLING, JCB, BORING.

Markers should be properly maintained near steel gas line with contact no. provided so that 3rd party could contact before excavation.

To Rectify 3rd party damage errors

Thank you