Blue Star Power Systems · Gaseous Product Line (PSI 4.3L)
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Blue Star PS40-01P
40 kW standby / 35 kW prime · Natural Gas / LPG · Liquid-cooled
35 kW prime / 40 kW standby natural gas / LP generator from Blue Star Power Systems. PSI 4.3L six-cylinder V6 engine with catalyst/silencer, Stamford UCI224C alternator, DSE DCP7310 controller, 208-600V output.
The Blue Star PS40-01P is a 35-kilowatt prime / 40-kilowatt standby natural gas and LP generator powered by the PSI 4.3L six-cylinder V6 — the same engine platform as the PS40-01, configured for continuous-duty prime power service. The "-P" designation identifies this as a prime-rated model with catalyst/silencer exhaust aftertreatment, 105°C temperature rise, and a 1-year / 1,500-hour prime warranty.
Blue Star Power Systems pairs the 4.3L engine with a Stamford UCI224C alternator and DSE DCP7310 controller. The OPU footprint is 80 × 42 × 59 in — 4 inches wider and 9 inches taller than the PS40-01 OPU, accommodating the catalyst/silencer assembly and prime-duty components. At 1,575 lbs, weight is identical to the standby companion.
The PS40-01P carries two ratings: 35 kWe prime and 40 kWe standby. The prime rating (35 kWe) is the correct rating for any application requiring continuous or unlimited-hours operation — base load power, peak shaving, or sites without reliable utility. The standby rating (40 kWe) applies to emergency backup use only.
Do not size a continuous-duty application to the 40 kWe standby rating. The PSI 4.3L V6 at 35 kWe prime operates within its continuous thermal envelope; at 40 kWe standby it operates at the short-duration overload limit. Size prime power applications to 35 kWe.
Catalyst/Silencer: Required for Prime Applications#
The three-way catalyst/silencer on the PS40-01P oxidizes CO and unburned hydrocarbons and reduces NOx to EPA stationary spark ignition standards for continuous-duty operation. It is factory-mounted and required for prime power compliance. All Blue Star prime-rated gaseous models include this assembly. Catalyst inspection and periodic replacement should be part of the annual PM schedule — catalyst efficiency degrades over time and is not externally visible without measurement.
Prime-rated gaseous generators require more disciplined preventive maintenance than standby units because they accumulate operating hours continuously. Catalyst condition, spark plug wear, fuel pressure stability, and coolant condition are all time-sensitive on the PS40-01P. The catalyst requires replacement at OEM-specified intervals — skipping this shortens the engine's working life due to back-pressure buildup. Gas pressure must be verified at full prime load: 550 ft³/hr NG at 11.0 in. W.C. is the sustained demand. Utility gas regulators often undersized for prime generator demand should be addressed at installation.
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
420,000 BTU/hr≈ 420.0 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 PS40-01P 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
Spark plugs / ignition
Misfire under load, hard starting
1,500+
minor
Battery
Failed to start during outage
8,760+
minor
Coolant system
Overtemp, coolant loss
6,000+
minor
Frequently Asked Questions
What is the difference between the PS40-01P prime rating and the PS40-01 standby rating?
The PS40-01P is rated at 35 kWe prime (continuous variable load, unlimited hours) and 40 kWe standby (emergency use). The companion PS40-01 is rated at 40 kWe standby only. The prime rating reflects the engine's continuous duty thermal limit — the PSI 4.3L V6 can sustain 35 kWe indefinitely at 105°C temperature rise (prime) but the standby 125°C rise is acceptable only for short emergency durations. The PS40-01P carries a 1-year / 1,500-hour prime warranty vs. the PS40-01's 2-year / 2,000-hour standby warranty. Select the PS40-01P whenever continuous operation at full output is required.
What is the catalyst/silencer on the PS40-01P and why does it differ from the PS40-01?
The PS40-01P includes a three-way catalyst/silencer rather than the standard critical-grade silencer used on the PS40-01. The catalyst is required for prime power applications to meet EPA stationary spark ignition emission standards at continuous-duty operating hours. The three-way catalyst oxidizes CO and unburned hydrocarbons and reduces NOx — the same function as an automotive catalytic converter. This is standard equipment on all Blue Star prime-rated gaseous models (-P suffix). The catalyst/silencer is mounted on the unit from the factory; it requires periodic inspection and replacement at OEM-specified intervals.
How does the PS40-01P OPU footprint differ from the PS40-01?
The PS40-01P OPU is 80 × 42 × 59 in (1,575 lbs) vs. the PS40-01 OPU at 80 × 38 × 50 in (1,575 lbs). The prime model is 4 inches wider and 9 inches taller to accommodate the catalyst/silencer assembly and the prime-duty cooling components. Length and weight are identical. Level 1 enclosure for the PS40-01P grows to 96 × 42 × 66 in vs. 90 × 38 × 60 in for the PS40-01. Confirm room dimensions before substituting one for the other — the additional 4 inches of width is the critical constraint in tight mechanical rooms.
What are the fuel consumption rates for the PS40-01P at prime output?
At 100% prime load (35 kWe), the PS40-01P consumes 550 ft³/hr of natural gas or 220 ft³/hr of LP. At 75% prime load: 442 ft³/hr NG or 177 ft³/hr LP. At 50% prime load: 340 ft³/hr NG or 136 ft³/hr LP. These figures are lower than the PS40-01 standby values (628/505/389 NG) because the prime rating is 35 kWe rather than 40 kWe. Required inlet pressure is 11.0 in. W.C. Heat rejected to coolant at full prime load is 138,000 BTU/hr; heat radiated to the room is 65,760 BTU/hr — notably higher than the PS40-01's 41,940 BTU/hr radiated value, reflecting the continuous operating cycle.
55 kW prime / 60 kW standby natural gas / LP generator from Blue Star Power Systems. PSI 5.7L eight-cylinder V8 with catalyst/silencer, Stamford UCI224E alternator, DSE DCP7310 controller, 208-600V output.
