Blue Star Power Systems · Gaseous Product Line (PSI 21.9L)
New
Blue Star NG425-01
425 kW standby · Natural Gas / LPG · Liquid-cooled
425 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 21.9L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
The Blue Star NG425-01 is a 425-kilowatt natural gas / LP standby generator built on the PSI 21.9-liter V12 platform. It is rated 425 kWe standby on natural gas and 300 kWe on LP at 60 Hz / 1800 RPM. Three-phase only (208V, 240V, 480V, 600V). This model shares its engine, footprint, and enclosure with the NG400-01 and NG450-01, providing stepped standby capacity on the same physical base.
The PSI 21.9L V12 is one of the highest-volume platforms in Blue Star's large-gaseous line. Service procedures — spark plugs, ignition coils, charge-air cooler hoses, oil and air filters — are consistent with the NG400-01. The DSE DCP7310 controller is identical across the NG400/425/450 range, keeping technician training requirements flat across units.
Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Fuel demand at 75% load
4,462,500 BTU/hr≈ 4462.5 cf/min @ 1,000 BTU/cf
On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.
Service intervals
Manufacturer-recommended intervals for the Blue Star NG425-01 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 12 months
Coolant change
Every 4000 hours
Air filter
Every 1000 hours
Spark plugs
Every 1500 hours
Major overhaul
≈ 15,000 hours
Load bank test
Every 12 months
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Turbocharger(s)
Significant power loss, heavy exhaust smoke
12,000+
severe
Ignition system (multi-cylinder)
Multiple misfires, output derating
1,500+
moderate
Charge air cooler
Reduced output, elevated intake temperatures
10,000+
moderate
Frequently Asked Questions
What is the standby rating of the NG425-01?
The Blue Star NG425-01 is rated 425 kWe standby on natural gas and 300 kWe standby on LP at 60 Hz / 1800 RPM. The LP-to-NG ratio at standby (71%) is typical for the PSI 21.9L V12 platform. Deration factors are standard: 1.5% per 10°F above 77°F inlet air temperature and 2.5% per 1,000 ft above 1,200 ft altitude.
What engine is in the NG425-01?
The PSI 21.9L — a 21.9-liter (1,338 cu in) V12 turbocharged-aftercooled spark-ignition engine producing 684 bHp (510 kWm) at 1800 RPM standby. The 21.9L V12 is the same platform used in the Blue Star NG400-01, NG425-01, and NG450-01 standby units, with electrical output tuned by the generator control system.
Is the NG425-01 available in single-phase?
No. The NG425-01 is three-phase only — 208V, 240V, 480V, and 600V configurations. Single-phase output is only available on Blue Star gaseous units up to 265 kW.
How does the NG425-01 compare to the NG400-01 and NG450-01?
All three use the PSI 21.9L V12 (684 bHp standby) and share the same 156×86×98 in footprint. The NG400-01 produces 400 kWe standby (300 kWe LP), the NG425-01 produces 425 kWe standby (300 kWe LP), and the NG450-01 produces 450 kWe standby (300 kWe LP). Selecting among them is primarily a matter of load margin — each shares identical alternator models at the 208V and 600V configurations.
400 kW standby · Natural Gas / LPG · Liquid-cooled
400 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 21.9L turbocharged V12, DSE DCP7310 controller, structural steel base, three-phase 208-600V.
450 kW standby · Natural Gas / LPG · Liquid-cooled
450 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 21.9L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
400 kW standby · Natural Gas / LPG · Liquid-cooled
375 kW prime-rated natural gas / LP generator from Blue Star Power Systems. PSI 21.9L V12, DSE DCP7310 controller, structural steel base, three-phase 208-600V.
350 kW natural gas standby generator from Blue Star Power Systems. PSI 14.6LHO high-output V8, DSE DCP7310 controller, structural steel base, three-phase 208-600V. Natural gas only — no LP rating.
300 kW standby · Natural Gas / LPG · Liquid-cooled
300 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 14.6L turbocharged V8, DSE DCP7310 controller, structural steel base, three-phase 208-600V.
300 kW standby · Natural Gas / LPG · Liquid-cooled
260 kW prime-rated natural gas / LP generator from Blue Star Power Systems. PSI 14.6L V8, DSE DCP7310 controller, structural steel base, three-phase 208-600V.