PRS-G series
Glycol bath heater. High-volume, continuous duty with reliable heating.
CNG delivery | Electric PRS
PRS-E450
Electrically heated pressure reduction from CNG tube trailers in two pressure cuts. Two electric heaters offset Joule-Thomson cooling ahead of the cuts, dual trailer manifolds allow changeover without interrupting flow, and a low pressure bypass keeps flow up as the trailer empties. Built for utility and LDC sites where open flame is not an option.
Overview
The PRS-E450 is NuBlu's electric pressure reduction system, designed for a gas utility project where fired and catalytic heat were not options. Two 27 kW electric heaters warm the gas ahead of the pressure cuts, the first cut to 500 psig through six parallel regulators and the second cut to delivery pressure, 200 psig as built.
Dual trailer inlet manifolds with check valves allow a trailer changeover without interrupting flow, and a low pressure bypass below 800 psig keeps flow up as the trailer empties. Heaters run only with flow and carry an independent high limit each; a fail-closed shutdown valve, E-stop and low inlet and outlet temperature trips close the loop.
Key specifications
| Design flow | 450 MSCF/d |
|---|---|
| Inlet pressure | Up to 4,700 psig (CNG trailer service) |
| Delivery pressure | 200 psig as built; first cut to 500 psig; other delivery pressures engineered to order |
| Heaters | 2 x 27 kW electric, ahead of the pressure cuts |
| Pressure control | Two cuts: six parallel regulators to 500 psig, then second-stage regulation to delivery pressure |
| Trailer connections | Dual inlet manifolds with check valves for changeover without interrupting flow |
| Low pressure operation | Bypass below 800 psig keeps flow up as the trailer empties |
| Controls | Watlow F4T temperature and interlock controller with Modbus TCP |
| Safety | Heaters run only with flow, independent high limit on each heater, fail-closed shutdown valve, E-stop, low inlet and outlet temperature trips |
| Area classification | Class I Division 2 skid; temperature control panel mounted outside the classified area |
| Design standards | ASME Section VIII Div. 1, B31.3, NEC, NFPA |
The PRS-E450 is built to the Hope Gas project basis. Larger electric units are engineered to order. Contact engineering for a sized proposal.
Why PRS-E450
No flame, no catalyst
Electric heating for sites and customers that exclude fired and catalytic equipment.
Changeover without interruption
Dual trailer manifolds with check valves let a trailer swap happen while gas keeps flowing.
Flow to the bottom of the trailer
A low pressure bypass below 800 psig keeps delivery up as trailer pressure falls, so more of each trailer is used.
Interlocked heating
Heaters run only with flow and each carries an independent high limit, with a fail-closed shutdown valve and E-stop.
Utility-grade controls
Watlow F4T temperature and interlock controller with Modbus TCP for the utility's SCADA.
Built and tested in shop
Final assembly, FAT and loop checks happen in our shop. Issues get caught in the shop, not on your site.
Typical applications
- Gas utility and LDC supply during outages and main replacement
- Sites where fired and catalytic heaters are excluded
- Industrial customers served by CNG trailer
- Standby and peak shaving gas service
- Temporary supply during construction or upgrades
What's included
- Skid with electric heaters, regulators and process piping
- Dual trailer inlet manifolds with check valves
- Temperature and interlock controller, instrumentation, wired and tested
- FAT package and operating manual
- Installation, commissioning and start-up procedure
- Recommended spare parts list and pricing
Engineering and aftermarket support
Every PRS ships with a complete engineering package: P&IDs, GA drawings, electrical load lists and an O&M manual. Critical spares 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