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
Regulating 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 Gas 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 Shut 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)

16. 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 .

17. 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

18. Different MAKE MRS
1)Inel

19. 2)Make:Inel with Nirmal PRV

20. 3)MAKE-Darling Muesco

21. 4)MAKE :Inel with Rockwin PRV

22. 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

23. Thank You !!