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BURIED SERVICES SAFETYPRECAUTIONS
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Safety & Welfare Arrangements
• Fire Alarm
Exits
Assembly point
• WelfareBreaks
Toilets
Please turn off
Mobile Phone Ring Tones
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OBJECTIVE
This procedure defines the requirements for the developmentof a safe system of work to minimise the risk arising fromdamage to and danger from buried services.
To explain procedure for identifying the underground serviceswith the help of cable detector (CAT: Cable avoidance tool)
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DEFINITION
CAT scanner: A person who has been trained in the use of aCable Avoidance Tool (CAT), assessed ascompetent and certificated. 4
Responsible Person The person who has the responsibility to ensurethat actions on site meet the requirements laid
down within this procedure. e.g. SiteManager/Supervisor.
Buried Services: The term “buried service(s)” means allunderground electricity, gas, water (includingpiped sewage), signalling andtelecommunications cables, ducts and conduits.They may be live, dormant or disused. The termalso includes these items laid on the surface but
have become partially obscured by ballast,vegetation, etc. It does not include undergroundstructures such as brick sewers, railway tunnels,etc but does include services buried in structurese.g. walls, columns.
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Indian Railway and utilitycompanies have a duty tomaintain records of undergroundservices and plans, and to makesuch information available to anenquirer. The supply of a buried
service search helps toconsiderably reduce the risk of aburied service strike incident.
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Buried Services along the track
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A buried services search must be requested from the Indian RailRepresentative before commencing work on site.
Charted and uncharted utility identification process for work area to be
jointly verified in presence of an Engineer
This request is to be approved by the responsible person prior to sending
to Indian Rail to ensure that the worksite has been accurately identified.
Where a buried services search has been provided within the contract
documents, responsible person must verify that the search covers the full
extent of ground disturbance works within the project.
If the buried services search is not sufficient, or the scope of works
changes, there must be an additional request, noting the timescales.
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Procedure for identify the buried services
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Hazards from bu r ied services
Utility services below the ground include Indian
railway signal cables, gas, water and drainage
pipes; electricity and telecommunications cables;high pressure fuel and gas pipelines.
Damage to Indian railway signal cables while
excavation work may lead to failure of signal
system of railways and stop the movement of
running trains on track which is against law to
disturb the schedule of railways.
Lifting equipment, excavators,
tipping lorries, or
scaffolding tubes
accidentally disturbing or
striking live underground
cables is a commondanger during
excavations.
Such incidents may result in
severe burns to hands,
face and body or even
death, due to the
explosive arcing current at
the point of contact, or the
fire which may follow
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Electr ic i ty cables
Injuries are usually caused by the explosive effects of
arcing current, and by any associated fire or flames
which may result, when a live cable is penetrated by
a sharp object such as the point of a tool. Such
effects can also occur when a cable is crushed
severely enough to cause internal contact between
the conductors or between metallic sheathing and
one or more conductors
Gas pipes
Damage to gas pipes can cause leaks which may lead
to fire or explosion and people being overcome byfumes. There are two types of damage:
that which causes an immediate leak;
that which causes a leak some time later, the damage
may occur at the time the work is carried out or
subsequently: for example poor reinstatement may
leave a pipe inadequately supported or subject to
unequal forces.
Signal cables
Indian railway signal cables are most important system
of smooth & safe running of trains on track as perschedule. The disturbance to these cables will affect
operation of trains which is very serious offense.
Types of Underground utility
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Water p ipes and sewers
Damage to water mains can result in the
excavation being flooded, but is less likely to
result in injury. However, water ejected from a
water main can contain stones or other hardobjects ejected from the ground around the
pipe
Leaks of water from underground pipes
can affect adjacent buried services and
reduce support for other structures
Hazardous pipel ines
The danger arising from damage to otherpipelines depends on the nature of the
conveyed fluid. Fluids and their associated
dangers include:
flammable liquids and gases - risk of fire and
explosion;
all fluids at elevated pressure - risk of injury
from sudden release of contents;toxic liquids and gases - risk of poisoning;
Types of Underground utility
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Site surveys for identification of utility
Visual surveys
A visual inspection of the site and the surrounding area
shall be carried out after receiving the buried services
information.
The survey should identify any evidence on the site of
buried services not identified in the buried services
records, and to check for evidence that will confirm the
location of the buried services that were identified.
The visual inspection shall always check for the existence
of signalling and telecoms cables as the records of these
often exist only in schematic form, and schematic
drawings are not provided as part of a records search.
Assume that buried services do not necessarily follow
straight lines and are not always at a constant depth
below ground level.
Cable avoidance tool (CAT) sc annin g
CAT scanning is a mandatory requirement in connection
with the identification of buried services. CAT scanning
should be carried out as close as possible to workcommencing on site but preferably not just before work
starts.
It is recommended that it should not be more than 14
days in advance.
Marking the position of
buried services
A person should be
nominated to mark the
positions of the cables andpipes on the ground, over
the full extent of the site.
Areas should be marked on
either side of the location
with chalk or paint.
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Know the C.A.T (Cable AvoidanceTool)
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Identification of Utility:If signal on screen showing increasing barsand it reaches its maximum level then it is thelocation of underground cable. When youmove forward signal again starts decreasingand the bars in screen too as you are goingaway from underground service.
Direction of Cable:After getting signalof cable twist CATin 360 ‘ ; when youget the maximumsignal bars onscreen then cableis exactlyperpendicular to
the equipmentdirection
Signal Screen of CAT
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Then sweep across the width of the excavation site, moving up thelength. If using a Genny in induction mode, position the Genny as
shown. If a cable or pipe is located, first establish the direction of thecable or pipe, then trace it across the area to be excavated,marking if required. Then resume sweeping over the excavation site.
Cable identification using locator by sweepingover work area
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Depth Identification of UtilityServices
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Permit to Earth Excavation/Boring clearancepermit
Permit to Earth
Excavation/Boring clearancepermit to be taken from respective issuing authority ateach work site whereexcavation work to be donealong side of Indian railway
track.Evidence of permits should bekept and record forverification at any time duringwork/after completion ofwork
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Thank You for your
attention
Any
Questions???
“Let’s go and build a railway
together……safely!!”
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