PRS / DCU / MRS Units
Pressure regulating, decompression and metering skids that turn your CBG into a multi-revenue ecosystem — from 250 bar cascades or plant pressure down to usable levels.
0 – 1,000 SCMH250 → 2 barSingle / dual streamPNGRB T4S compliant
5+
PRS / decompression units delivered
0 – 1,000
SCMH flow range
250 → 2 bar
Pressure reduction (customizable)
Two-stage
Reduction with water-bath heating (DCU)
Overview
Deliver gas at exactly the right pressure
High-pressure CBG or CNG cannot be used directly by burners, gensets or PE networks. PRS, DCU and MRS skids reduce the pressure safely and precisely, filter the gas, meter it for billing and protect everything downstream from over- or under-pressure.
Each skid is fabricated to ASME standards and PESO-approved, with active–monitor regulation, slam-shut and creep-relief protection, electronic volume correction and fully automated pressure interlocks.
Three solutions
PRS, DCU and MRS — what’s the difference?
PRS — Pressure Regulating Skid
Reduces pipeline or plant pressure to network or consumer pressure. Used for CBG grid injection and industrial supply.
DCU — Decompression Unit
Takes gas from 250 bar mobile cascades and reduces it in two stages with a water-bath heater to prevent freezing.
MRS — Metering & Regulating Station
Combines pressure regulation with custody-grade metering and EVC for billing at consumer premises.
Technical specifications
Standard specifications
General
Flow rate
0–1,000 SCMH
Stream configuration
Single / dual stream
Pressure range
250 bar → 2 bar (customizable)
Design temperature
0 to 65°C
Build standards
ASME fabrication, PESO approved, PNGRB T4S compliant
Regulation & protection
Regulation
Active + monitor pressure control valves
Over / under pressure
Slam-shut valve (OPSO / UPSO)
Creep relief
CRV on each stage
Isolation
Inlet / outlet ball valves, NRV
Venting
Vent stack min. 3 m above working platform
Metering & filtration
Flow meter
Rotary positive displacement (RPD) or turbine
Volume correction
Electronic Volume Corrector (EVC)
Filtration
High-efficiency filter with DP indication
Instruments
Pressure gauges (0–400 / 0–60 / 0–10 bar), RTD PT100
DCU specifics
Inlet
Up to 250 bar from mobile cascade
Reduction
Two-stage (e.g., 250 → ~40 bar → 4 bar)
Heating
Electric water-bath heater, level switch
Standard models
250 SCMH and 475 SCMH
Trips
Water high temperature (80°C), inlet & outlet pressure alarms
Reference data
Typical skid configurations
| Parameter | PRS — 250 SCMH (low pressure) | DCU — 475 SCMH |
|---|---|---|
| Inlet pressure | 6 / 19 /49 bar(g) customizable | Up to 250 bar(g) from mobile cascade |
| Outlet pressure | 3–5 bar(g) as per customer requirement | Approx. 4 kg/cm²(g) |
| Design pressure | 19 bar(g) as per customer requirement | 400 bar gauge range on HP side |
| Stage 1 set points | PCV 4 bar · SSV 5 bar · CRV 5.5 bar as per customer requirement | PCV 40 kg/cm² · SSV 27–44 kg/cm² · CRV 42 kg/cm² |
| Stage 2 set points | — | PCV 4 kg/cm² · SSV 1–6 kg/cm² · CRV 5 kg/cm² |
| Metering | RPD meter with EVC | Mass / volume metering as specified |
| Connections | 2" inlet, 1.5" 150# outlet | As per site |
Applications
Who uses PRS / DCU / MRS
Industries
Hospitals
Restaurants & Chemical Kitchens
Gas Gensets
Corporate Parks & Hotels
DCU range
Decompression units from 250 to 1000 SCMH
Single-stream DCUs taking gas from 250 bar cascades down to 2–4 bar.
FAQ
Frequently asked questions
Q.Why does a DCU need a heater?
When gas expands from 250 bar, its temperature drops sharply (Joule–Thomson effect). The water-bath heater pre-heats the gas so regulators do not freeze and outlet temperature stays safe.
Q.Can CBG be injected into a CGD network through a DCU?
Yes. PNGRB guidelines allow CBG to be transported in mobile cascades and injected into PE or steel networks through a decompression skid with heating and full protection.
Q.What is active–monitor regulation?
Two regulators work in series: the active regulator controls pressure, and the monitor takes over automatically if the active one fails — so downstream pressure is never lost or exceeded.
Q.Are these skids approved?
Skids are built to ASME fabrication standards, PESO approved and compliant with PNGRB T4S requirements.
Opening new revenue streams from your CBG?
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