Natural Gas Pipeline Optimisation

About GSPL

• 2nd Largest pure Natural Gas Transmission network in India• 2192 km• Volume Capacity – 18MMSCMD• Current Capacity-22MMSCMD• Equipped with the latest bi-directional gas transmission technology to

enable two-way gas flow.

Pipeline Optimization

• Scope for Pipeline Layout optimization Includes • Determining Optimal Layout• Determining Optimal Diameter of various pipes• Determining the locations and number of valves, regulators, and compressors

• Initial Laying cost (c) has 3 major components: • Steel quantity• Overcoating of pipes • Cost of Laying pipes underground

• Most of these costs are fixed w.r.t Pipe diameter

• Initial Pressure (Baroda)• Required Pressure (Baroda)• Initial Pressure (salaya)• Required Pressure (salaya)• Power requirement (MW/day)• NG requirement (in SCMD)• Total Cost/year (in Cr)• Total Cost over lifespan of compressors (in Cr)

Case 1 2 3

Assumed Demand(in MMSCMD) 11 14 15

Initial Pressure (Baroda) 78.63 78.63 -

Required Pressure (Baroda) 94.6 92.42 -

Initial Pressure (salaya) 64.35 41.1 -

Required Pressure (salaya) 69 84.8 -

Power requirement (MW/day) 4.81 20.788 35.27

NG requirement (in SCMD) 28904.46 124728 211620

Total Cost/year (in Cr) 14.87 60.31 94.23

Total Cost over lifespan of compressors (in Cr) 223.05 904.65 1413.45

Conclusion

• The cost decrease if we use compressor for demand up to 13-14

MMSCMD.

• The increase in 1 MMSCMD increases the cost by 30 cr.

• Hence the loop lines are best option for demand more than

13-14 MMSCMD

Key points

• As a Industry is dynamic in nature it is very difficult to ascertain future

supply and demand.

• As the pipeline has life of 40 years it must be designed considering

future demand and operations.

• Usage of Multistage instead of single stage

• The Compressor locations should be planned as per future Demand.