approved in the District in 2014, Freen

usefulAll the Deputy Executive Engineers are hereby requested to submit the pending hired vehicle bills for maximum up to 03 months of Intra and Grid separately along with Non draw certificate in prescribed format for the financial years 2019-20, 2020-21 & 2021-22.
Further, requested to send the pending bills along with Following documents: Covering letter from concerned DDO, Original check slip, C.C form, attested copies of agreement, Registration certificate, Permit, Fitness, Insurance, Pollution, GST & bank details and Originals of Non drawl certificate, Utilization certificate, Tour diary etc Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
,
Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
Functional taps in GP
No tap houses
Dismantling Houses CERTIFICATE

This is certify that, I have surveyed all the House holds in my GP, no house has been left without surveying.
Total No. of HSC in the GP ::

Institutions, religious
Devided Families
Any others shops, factories etc.,
To take up the sanctioned works, the Rig Owners are not coming forward to execute the works, as the present rate approved in the District is not workable as the rates are approved in the District in 2014, From then onward there is not revision of rates and the cost of fuel, lubricants, drilled bit and hammer, labour charges, transportation charges, crew

1. Project Name: O&M KHAMMAM
Project Code: LE190460

2. Sensitivity: LNT Construction Internal Use
REPAIR OF PIPE LINE
It is one of the most important responsibilities of a Water
Undertaking to properly maintain the transmission and
distribution mains in order to prevent waste and provide
a constant pressurized flow of potable water to the
consumers. It is equally important to prevent damage to
the public property which could arise for not properly
repairing a defective pipe. Proper planning and
implementation of remedial measures will avoid
leakages and breakdowns.

3. Sensitivity: LNT Construction Internal Use
CAUSES0FFAILUREINPIPELINE
Forproperplanningfortheoperationoftherepairworkitisnecessarytoassesstheprobablecausesoffailure.Followingguidelinesoutlinesomeofthefactorstobedulyconsidered
toensureprotectionofpipesfromdamage/failure.
1. HANDLINANDST0RAGE0FPIPES
1.Damageduringtransportofthepipingmaterial.
2.Defectivestackingandstorage.
3.Damagetothepipewallandcoating.
4.Cracksinpipeduringcarelessunloadingandpipesstrikingagainsteachother.
5.Weatheringeffectduetounfavorableenvironment.
6.Mixingupofdifferentclassesofpipesandtheirjointingmaterials.
2. LAYIN0FPIPELINE
1..Deviationfromproperlaying procedures.
2. Improper bedding
3. Loss of support of bedding after laying.
4. Slipping of trench sides.
5.Sinkingofsoilafterlaying.
6.Poorqualityofbackfillmaterial.
7.. Impropercompactionoftrenchbackfillanditssubsequentsettling.
8.. Excessiveoverburdenonpipingtrenches,nottakencareofduringthedesign ofpipeline.
9.. Pointloadscomingonthepipethroughthebackfill.
10.Excessivevibrationsduetotrafficduringthelayingofpipeline.

4. Sensitivity: LNT Construction Internal Use
3 J0INTIN0FPIPES
1.Defectivejointingmaterial.
2.Directstrikeonthebodyofthepipewithanysharpedge,whilejointing.
3.Slippingofjointingmateriallikerubberringorleadetc.
4. CHARACTERISTICS 0F S0IL
1.Corrosivenatureofsoilcausingdamagetotheexternalsurfaceofthepipe.
2.Extremesofclimate:frostheaveorclayshrinkage.
3.Lossofsupportoranchorage(horizontalorvertical),bothincaseofpipesembedded andthoselaidabovegroundlevel.
4.Movementofsoilduetofilledsoil,mining.
5.Movementofsoilwhileworkoflayingpipesorotheractivitieslikelayingofcables etc.istakenup.
6.Changesinsoilmoistureorwatertableconditions.
5. EXCESSIVE TEMPERATURE CHAN GES
1.Expansion:severecompression,endcrushing.
2.Contraction:pulloutorseparationofjoint.
3.Freezing:pipeblockagesandsplits.
6. INTERNAL PRESSURE
1.Excessivetestpressure.
2.Pressuresurge,waterseparation,vacuum.
3.Extendingpipeconnectionswithoutproperprecautions.
7. ARESSIVEWATER
Damagetotheinternalsurfaceofpipeaswelltheliningmaterial.

5. Sensitivity: LNT Construction Internal Use
FAILURE AT PIPE J0INTS
1. General
1.Failures may occur due to originally careless installation practices causing displacements of the seal and/or eventual separation of the mating surfaces.
2.Stress cracking of pipe material around the joint.
3.Biodegradation of the sealing components.
2. Flanged connections
Stress cracking of the flange can occur due to unequally tightened bolts. Such a situation arises during ground movement or the forceful activation of a valve or hydrant.
3. Crushing of pipe ends
Cracking may occur due to crushing of pipe ends when they touch or bind and are then subjected to high compressional or bending forces.
4. Lead joints
Hardening of lead in association with joint movement may lead to ‘weeping’ which gradually develops into a more serious leak.
5. Sealing rings or gaskets
Many mechanical joint designs rely upon the compression of sealing rings or gaskets which have varying compositions and different resiliences. The physical breakdown
(e.g. biodegradation) or change of resilience with time can lead to leaking joints. The loss of compression combined with corrosion of pressure rings or collars or the bolts may
aggravate the breakdown.

6. Sensitivity: LNT Construction Internal Use
REPAIR ACTI0N PLAN
1 . Internal mobilization.
2. Detection of pipe failure: Inspection of site
3. Notification of interruption in water supply and related issues.
4 . Location and demarcation
5.Repair planning
6.. Repair work: Selection of most appropriate method for repair. 7 . Testing of ‘dry’ repair.
8.Restoration
9.Completion
10.Hygiene
11.Notice of restoration and completion
REPAIR METH0D F0R DIFFERENT TYPES 0F PIPES
MATERIAL CASTIRON
Burst Action Repair
Jointfailure Enclosejoint
Twocouplers
Specialjointclamp
Twocouplers andnewsection
Brittlefailure Removesection/joint
Enclosefailure
Twocouplersandnewsection
Repaircollar orclamp
Corrosion Removesection/joint
Rehabilitationtechnique
Enclosefailure
Twocouplersandnewsection
Slipliningetc.
Repaircollarorclamp
CI Pipe:

7. Sensitivity: LNT Construction Internal Use
MATERIAL DUCTILEIRON
Burst Action Repair
Jointfailure Enclose joint
Removesection/joint
Specialjointclamp
Twocouplers andnewsection
Extensivepinholing Rehabilitationtechnique
Removesection/joint
Slipliningetc.
Twocouplers andnewsection
Ductilefailure Removesection/joint
Encloseburst
Twocouplersandnewsection
Repaircollar orclamp
Localisedpinholing Encloseburst Repaircollarorclamp
MATERIAL STEEL
Burst Action Repair
Extensivepinholing RehabilitationTechnique
Removesection/joint
Slipliningetc.
Twocouplers andnewsection
Jointfailure Removesection/joint
Enclosejoint
Twocouplersandnewsection
Specialjointclamp
Isolatedpinholing Encloseburst Patch andweld
Repaircollarorclamp
MATERIAL ASBESTOS CEMENT
Burst Action Repair
Surfacesoftening Removecompletepipelength Newpipesectionandfittings
Longitudinalcracking Removecompletepipelength Newpipesectionandfittings
Jointfailure Removecompletepipelength
Enclosejoint
Newpipesectionandfittings
Jointrepairclamp
Circumferentialfailure Encloseburst Repaircollarorcalmp
DI Pipe:
Steel Pipe:
AC Pipe:

8. Sensitivity: LNT Construction Internal Use
MATERIAL PRESTRESSED CONCRETE
Burst Action Repair
Surfacesoftening Removecompletelength/joint
orcracking
Twocouplersandnewpipesection
Jointfailure Removecompletelength/joint
Enclosejoint
Twocouplersandnewpipesection
Specialjointclamp
MATERIAL POLYETHYLENE/P.V.C.
Burst Action Repair
Fastcrackpropagation Removedamagedsection Twocouplers andnewsection
Brittlefailure Removedamagedsection
Encloseburst
Twocouplersandnewsection
Repaircollar orclamp
Jointfailure Cutoutjoint Twocouplers andnewsection
MATERIAL GLASSREINFORCED PLASTIC PIPES(GRP)
Burst Action Repair
Jointfailure Enclose
Replace
joint
joint
Jointclamp
Repaircollarorclamp
Delamination Remove
Enclose
section
failure
Twocouplersandnewsection
Repaircollar orclamp
Fracture/damage Remove
Enclose
section
failure
Twocouplersandnewsection
Repaircollar orclamp
PC Pipe:
PVC Pipe:
GRP Pipe:

9. Sensitivity: LNT Construction Internal Use
HDPE & DI Laying Procedure :

10. Sensitivity: LNT Construction Internal Use
PROCEDURE FOR PIPE WELDING
❖ Survey and marking
❖ Trenching
❖ Pipe stringing
❖ Mockup joint
❖ Joint Inspection
❖ Pipe fit-up & Jointing
❖ Lowering and Backfilling
❖ HDPE Fittings
10

11. Sensitivity: LNT Construction Internal Use
Mockup joint
➢Mock up for HDPE pipe jointing to be done for all diameter
pipes & all jointing machine.
➢Based on the Diameter and Thickness of pipe; Pressure
,temperature heating time and cooling time need to
followed as per the Plastic jointing machine manual and
relevant standard.

12. Sensitivity: LNT Construction Internal Use
Joint Inspection
➢Cut the welded joint cross-sectionally and check visually for
joint fusion
➢Manually bend the jointed position and check

13. Sensitivity: LNT Construction Internal Use
Pipe Fit-up & Jointing
➢The HDPE pipes should be kept inline with the pipe
holder and the bolts need to be adjusted so that the
alignment should be proper.
➢The inside and outside edges to be cleaned before
jointing

14. Sensitivity: LNT Construction Internal Use
Pipe Fit-up & Jointing
➢The cutting wheel is used to match the face of the pipes to be jointed

15. Sensitivity: LNT Construction Internal Use
Pipe fit-up & Jointing
➢The heating plate is used to fuse the pipe to be jointed, The
heating time is based on the pipe diameter and thickness

16. Sensitivity: LNT Construction Internal Use
Pipe fit-up & Jointing
➢After jointing it should be cooled ,The cooling time is
based on the diameter and thickness of pipe.
Jointing video
Time Operation
0.0 Fit-up
5 – 47 sec Cutting
48 sec – 2 min 34 sec Heating
2 min 35 sec – till end Welding (& thereafter
Cooling for specified
time)

17. Sensitivity: LNT Construction Internal Use
Lowering and Backfilling
➢After lowering copper wire to stringed along the pipe length
and then it should be backfilled

18. Sensitivity: LNT Construction Internal Use
HDPE Fittings
STUB END STUB END WITH FLANGE
REDUCER
BEND 11.5
0
BEND 22.5
0
BEND 45
0 BEND 90
0
T-JOINT

19. Sensitivity: LNT Construction Internal Use
BFV ERECTION & CONNECTION FROM
DI TO HDPE BY USING STUB END AND
FLANGE
CONNECTION FROM HDPE TO GI
OUTLET CHAMBER

20. Sensitivity: LNT Construction Internal Use
Pipe jointing
Step 1:
➢Cleanliness of all parts, The inside of sockets and the
outside of spigots shall be cleaned for a distance of 150 to
225 mm
➢Glands and gaskets shall be wiped clean and inspected
for damage.
Step 2:
➢Applying lubricant inside the socket and outside the
spigot in DI pipe
Step 3:
➢Placing the rubber gaskets in the socket end.
Step 4:
➢Jointing the pipes by manual push or using chain pulley
method.
Water Flow

21. Sensitivity: LNT Construction Internal Use
Pipe jointing

22. Sensitivity: LNT Construction Internal Use
Backfilling
➢The backfilling of trenches shall be done with watering and
compacting in layers under "optimum moisture content”
condition to achieve required density of refilling and strength
after compaction.

23. Sensitivity: LNT Construction Internal Use
DI fittings
BEND 90
0 SOCKET REDUCER BEND 45
0
FLANGED TEE SOCKET TEE
BEND 22
0 FLANGED SOCKET
FLANGED SPIGOT

24. Sensitivity: LNT Construction Internal Use
Documents for DI pipe laying
❖Inspection test plan for DI pipe laying
❖Method statement for DI pipe laying
❖Pipe laying register
❖Request for Inspection
❖Daily Quality Pep talk

25. Sensitivity: LNT Construction Internal Use
Thanks