Supply of NG to Multi Occupancy Residential buildings

Dec 2018

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Standard Safety Practices for Supply of PNG

PE Pipeline – Design Features

o Laid with typically 1 m Top Cover plus RCC Tiles and Warning Tapeo Low Pressure(100 mbar) network inside Residential Premiseso Can be easily squeezed off for Stopping Gas Supply during

Emergencyo Best Method of PE jointing i.e. Electrofusion Fittings are used

PE Pipeline – Safety Features

o Extensive Patrolling – Twice a Dayo Use of VTS for effective Monitoring of

Patrolling Activityo Leak detection Survey – Once in a Yearo Co-ordination meetings with other Utilityo Use of Anti- Rodent HDPE Sleeve for

Safeguarding Crimps from Rodent Bite

o Damage Preventiono Avoid Rate biteo Minimize Joint

failures

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Standard Safety Practices for Supply of PNG

GI Pipe - Riser

o Powdered Coated Pipeo Welded Joints in High Rise Building Risero Use of Pre – Sleeved hole piece for Wall

Crossingo Use of Aluminium Clampso Installation – Open to Atmosphereo Periodic Maintenance of Riser Pies

o Corrosion Free Risero Minimize Joint failures

Domestic Meter Installation

o Meter Control Valve (MCV) at the entry Pointo Meter Installation in adequately Ventilated

Areao Preventive Maintenance at Regular Intervalso Leak Test

Pre Sleeved Hole Piece

Material Selection

• Use of ERW GI pipe, C class

• Fittings - Forged / Malleable cast iron fittings

• GI pipe clamp - Aluminum

• Screws - SS 304

• 100% weld joint on riser (threaded joints for lateral)

• Flexible hose (anaconda) - SS 306L

• Pre-sleeved Hole piece (for wall crossing)

Safety Challenges While Working at Heights

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➢ Heavy Winds

➢ Loss of Balance due to gusty Winds

➢ Obscured Vision

➢ Stability issue at Height while Working with Industrial RopeAccess System

➢ Vertigo Problem

➢ Transportation of the required Material at Height

Safe Construction Practices

• Riser installation preferably on outer wall of building

• Risk assessment if riser to be installed inside utility duct

• Use of flexible hose (anaconda) - to allow for thermal expansion / contraction in riser.

• Isolation valve for each lateral

• Pipe clamp at every 2.5 meter

• Riser Pneumatic test @ 1.0 bar (operating pr. max. 100 mbar)

• Isolation valves - Nickel plated Forged Brass

Safety Management System

• WAH Permit for every site

• Site specific HIRA

• Trained Plumber (STC) / Medical check up - Every year

• Use of Industrial Rope Access system (PETZEL) along withfall arrestor mechanism - Annual inspection by vendor & dailyinspection at site.

• Training cum certification of Plumbers from PETZEL - oncein a year

• 100% site supervision

• Use of Cradle / Metallic Scaffolding on need basis (Certifiedby DISH inspector)

Probable Mitigation Measures

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➢ Use of Suspended Platform System

➢ Installation of Harnesses and Fall-Prevention Anchors

➢ Robust Site- Specific Risk Assessment System

➢ Annual Medical Check Up of Plumbers/Helpers.

➢ STC(Safety and Technical Competency) Trained Team

Case Study – High Rise Building

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• Building – Located in South Mumbai

• Floors – 27 Nos.

• Constraint - Space Constraint for Riser Installation•

• Service Provider - M/s Skyrise Cradle Associates

• Work Completed Time – 5 to 6 Working Days

Suspended Platform PNG Installation in Progress

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Cradle Assembly PNG Installation at Site

GI Pipe Installation Work Tag Out while Leaving the Site

Suspended Platform System

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Pre Checks before Commencing the Work :

• Permit to WAH using Suspended Lift

• Risk Assessment

• Form No. 11 (Fitness Certificate of the equipmentwith DISH approved Agency)

• STC Cards of Team

• Testing Certificates of Machine

Challenges

• Buildings generally with glass facades - no provision forerecting riser on external wall of building

• Inadequate ventilation in utility duct

• Kitchen are located at the center of the building (nowindow which opens to the outside of the building fornatural ventilation

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