Presentation on Meter Regulating Skid(MRS)

In this, natural gas is supplied through mild steel(MS ) and polyethylene(PE) pipelines to cater to the Natural gas demand in Domestic ,Commercial & Non-Commercial and industrial segments .

1. Presentation on MRS (Meter Regulating Skid) By-: Harshit Kumar Gupta (Mechanical Engineer)

2. Introduction to PNG PNG stand for Piped Natural Gas . In this, natural gas is supplied through mild steel(MS ) and polyethylene(PE) pipelines to cater to the Natural gas demand in Domestic ,Commercial & Non-Commercial and industrial segments . In PNG the pressure varies from 4 bar to 21 mili bar.

3. Network of PNG line CGS-City Gate Station CPRS-Common Pressure reduction Skid DRS-District Regulating Skid MRS –Meter Regulating Skid SR-Service Regulator CNG-Compressor Natural Gas . NOTE : Gas form the CGS is of 26 bar , Figure shows old Data of Gujarat Gas CGS.

4. What is high pressure MRS/IMS ? MRS stand for Meter Regulating skid / Industrial R egulating skid. MRS basically convert the pressure of 4 Bar to 1.5 bar with the help of PRV. It is used to supply Natural gas at a pressure of 1.5 bar to industries .

5. MRS consist of following components -: Filter Pilot operated PRV with slam shut valve (SSV) Rotary Ga s Meter CRV -Creep Relief valve Strainer ECV-Electronic Volume Converter. Pressure gauge Ball valve

6. Flow diagram for MRS Inlet line  Filter  PRV Meter  Outlet line

7. Working of MRS Natural gas of 4 bar enter the filter and gas is filtered . After ,filtrations gas enter the pressure regulating valve which convert the gas pressure of 4 bar to 1.5 bar . After conversion of gas to 1.5 bar, the gas flow through the rotary gas meter which measure the volume of fuel gas and is passed to outlet to customer for consumption. The PRV is linked with slam shut valve (SSV) which is set at a pressure of 2.1 bar for tripping the system , in case pressure increases beyond permissible limit. Creep relief valve(CRV) which is safety device and mounted after PRV ,set at a limiting pressure of 1.9 Bar. When the pressure increases from 1.9 Bar ,the CRV start puffing.

8. Function of different components in MRS Filter – It is used to screens out dirt and rust particles from the fuels . Filter Cartridge of 5 Microns is used generally.(1 microns =1x10^-6 m) MAKE-Delta filters (OD x ID x L=75x40x300)

9. PRV–Pressure Regulating Valve It automatically reduces a higher inlet pressure to a steady lower downstream pressure ,regardless of changing flow rate and varying inlet pressure. Like other PRV ,pilot operated regulating valve are used for emergency relief during overpressure events .

10. SSV-Slam S hut Valve (Tripping Pressure=2.1 Bar) It is installed immediately after the filter and is attached to the regulator . It normally remains in open mode ,in case the pressure of the regulator exceeds the permissible limit ,the slam shut off valve senses it through the impulse line and immediately shut off the flow.

11. CRV- Creep Relief Valve (Puffing Pressure =1.9 Bar) Relief valve is designed or set open at a predetermined set pressure to protect the pressure vessel and other equipment from being subjected to pressure that exceeds their design limit. The creep relief valve is set at a pressure of 1.9 Bar

12. ECV-Electronic Gas Volume Convertor It takes the incoming pulse signal from a gas meter and also record the local pressure and temperature to calculate the standard of gas that has passed through the gas flow meter.

13. Rotary Gas Meter These are highly machined precision instruments capable of handling higher volume and pressure than diaphragm meters .Within, meter two 8 shaped lobes ,the rotor spin in precise alignment ,with each turn they move a specific quantity of gas through meter .The rotational movement of the crank shaft serves as a primary flow element and produce electrical pulses for a flow computer .

14. G-25 /G-40/G-65/G-100/G-160/G-250/G-400/G-650)

15. Activities of Preventive Maintenance in MRS Cleaning of MRS. Corrosion survey. Leak test of TF joint , other joints and tubes. Cleaning of filter . Cleaning of strainer . Overhauling of PRV . Setting of pressure . Functional check of SSV,CRV and PRV. Visual check of running meter and meter oil. Lubrication and greasing canopy door hinges .

16. Type of complains Low Pressure High Pressure No Gas Meter Not working Gas Leakage Pressure Fluctuation Meter Hanged Pipeline Damaged (MRS Pipeline) Meter Running Fast Fire Gas smell

17. Different MAKE MRS 1) Inel

18. 2) Make:Inel with Nirmal PRV

19. 3)MAKE-Darling Muesco

20. 4)MAKE : Inel with Rockwin PRV

21. Low Pressure MRS In pressure MRS pressure of 4 bar is converted to 21 mbar . It consist of Following Components-: 1)Service Regulator(SC) 2)Rotary Gas Meter 3)Strainer

22. Thank You !!