PRS-G series
Glycol bath heater. High-volume, continuous duty with reliable heating.
CNG delivery | Glycol bath PRS
PRS-G8000
Trailer pressure in, site pressure out, built for high-volume CNG. NuBlu Energy's flagship glycol bath pressure reduction system takes gas straight from CNG trailers down to user-defined site pressure with the heating capacity, redundancy and automation needed for continuous delivery up to 8,000 MSCF/d.
Overview
CNG delivered from trailers arrives at high pressure and drops sharply on its way to site pressure. That pressure drop cools the gas fast enough to freeze regulators, valves and downstream equipment if the heat is not put back in. The PRS-G8000 puts it back with a 2 MMBTU/hr glycol bath heater sized for continuous delivery up to 8,000 MSCF/d.
Redundant control valve (stage 1) and Mooney regulator (stage 2) circuits keep gas flowing even during maintenance. User-definable outlet PSVs and onboard fuel gas mean the unit ships ready to drop on site, hook up and run. Trailer swap logic, multi-trailer mode and start-up sequencing are handled in software.
Key specifications
| Pressure cuts | 2-stage standard (3 and 4 stages optional) |
|---|---|
| Heater type | Glycol bath, 2 MMBTU/hr |
| Flow rate | 500 to 8,000 MSCF/d |
| Inlet pressure | Up to 4,200 psig (CNG trailer service) |
| Outlet pressure | User defined, set per application |
| Pressure control | Redundant control valve circuits (stage 1), redundant Mooney regulator circuits (stage 2) |
| Turndown | Large turndown, extremely low delta-P |
| Overpressure protection | User-definable outlet PSVs |
| Fuel gas | Onboard fuel gas system for the heater burner |
| Automation | Fully automated PLC with HMI, remote monitoring via Ewon |
| Footprint | Trailer mounted, under 30 ft, about 43,000 lb |
| Design standards | ASME Section VIII Div. 1, B31.3, NEC, NFPA |
| Skid | Single skid, fully assembled and FAT-tested in shop |
Final outlet pressure, valve trim and PSV settings are configured to your application. Contact engineering for a sized proposal.
Why PRS-G8000
Glycol bath heating
2 MMBTU/hr glycol bath heater sized for continuous 8,000 MSCF/d delivery. Keeps gas above hydrate and freeze conditions even during sustained high-flow operation.
Redundant pressure control
First-stage cut by two parallel control valve circuits, second-stage cut by two parallel Mooney regulator circuits. Run on one, service the other. No shutdown for routine maintenance.
Mobile package
Trailer mounted and under 30 ft, designed to move between sites and operate wherever CNG trailers are staged.
Fully automated
PLC-based control with HMI and remote monitoring via Ewon. Trailer swap logic, multi-trailer mode and start-up sequencing handled in software.
Onboard fuel gas
Self-supplied fuel gas for the heater burner. No external fuel hookup required to start producing heat.
Built and tested in shop
Final assembly, FAT, loop checks and HMI commissioning happen in our shop. Issues get caught in the shop, not on your site.
Typical applications
- Dual-fuel frac and e-frac fleets
- Drilling rig fuel gas supply
- Mobile and temporary power generation
- Pipeline integrity work and pipeline pack-up
- Peak shaving and standby gas service
- Remote site CNG-to-line-pressure conversion
What's included
- Trailer-mounted skid with glycol bath heater, control valves and process piping
- Stage 1 control valve and stage 2 Mooney regulator circuits, redundant
- User-definable outlet PSVs
- Onboard fuel gas system
- PLC, HMI and field instrumentation, wired and tested
- Trailer-swap and multi-trailer control logic
- Cause-and-effect diagram, control narrative and FAT package
- ASME-stamped pressure vessels, B31.3 piping
- Installation, commissioning and start-up procedure
- Recommended spare parts list and pricing
Engineering and aftermarket support
Every PRS-G8000 ships with a complete engineering package: P&IDs, GA drawings, electrical load lists and a full O&M manual. Critical spares, including control valve trims and instrumentation, are stocked at our shop for fast response.
Field service, troubleshooting and remote diagnostics are handled by the same team that designed and built the unit.
The PRS family: pick the heat source, then the capacity
PRS-C series
Catalytic heater. Flame-free, compact, no separate fuel hookup.
PRS-E series
Electric heater. Utility and LDC sites where open flame is not an option.
- PRS-E450up to 450 MSCF/d
- Larger ePRSengineered to order