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FEASIBILITY STUDY

Desktop Study

Desktop study is the first step in survey which is conducted to identify shortest alternative routes avoiding hilly / broken areas, water-logged / flood prone areas, Forest area, WL& CRZ area, Mining, Coal belt, Defense land, densely populated areas / city limits, declared eco sensitive zones by MoE&F, burial ground & Archaeological sites, stretches of rivers etc. as far as possible.

Reconnaissance Survey

In this step, the identified routes are physically verified using the toposheets from SOI (Survey of India) & other maps (WLS, NP, Mining, SEZ, CRZ, City Development map etc.) and Flag control points are marked on all major crossings with hand-held Global Positioning System (GPS). These GPS coordinates are then reconciled with the Latitude – Longitude coordinates of Topo sheet to ensure that the route is correctly identified on the Topo map.

DETAIL ENGINEERING SURVEY

In detail engineering, DGPS Control Points are established on the final route to achieve accuracy.

Fly levelling is carried out from nearest established GTS Bench-Mark (SOI) along the route connecting all the DGPS Control Points. Permanent benchmarks (BM) shall be established on the corridor and major crossings as per the requirement. Total Stations is used to traverse control between DGPS stations to establish UTM coordinates of all turning points & intermediate points.

Conduct a detailed Route Survey using Modern Technique. Total Station operator will pick-up the centerline RL and established TP/IP Points, cross section of all crossings and topographical features en-route.

RCC Pillars are embedded at all Turning Points (TP), Intermediate Point (IP) and two Pillars on either side of major crossings.

POPULATION DENSITY INDEX

The population density index survey is carried out in accordance with ASME & ANSI B31.8 "Gas Transmission and Distribution Piping Systems" and OISD-141, 226 standard using GPS and co-ordinates to identify any dwelling falling within the given range on either side of pipeline

During the field work the class details are also furnished based on the population for every 1600 m (one mile) so that the pipeline can be designed accordingly