Sullivan-Palatek D Series Rotary Screw

D-25 through D-350

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Sullivan-Palatek D Series Rotary Screw

25–350 hp direct-drive oil-flooded rotary screw, US-built.

Type
Oil-flooded rotary screw
Power
25–350 hp
Flow
100–1,650 cfm
Pressure
100–190 psig
Cooling
air-or-water
Drive
direct
Lubrication
oil-flooded
Models
D-25 through D-350
Years produced
SP D-Series in production since 1990s; ongoing incremental refresh.
Sound level
~72–80 dB(A) @ 1 m.
Ambient range
40–115 °F.
Motor efficiency
NEMA Premium TEFC.
Warranty
5-year airend option.
Control modes
  • Load/Unload
  • VSD variants
Typical applications
  • Custom industrial
  • Marine
  • Government / military packages

Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.

Fluid
Spec: SP-branded PAO fluid
Change interval: 8,000 hr
Wear parts
CategoryIntervalSource
Air filter2,000 hr
Oil filter2,000 hr
Separator element4,000 hr
Motor bearingsPer motor plate

Consumable part numbers change by revision and region — pull the current number from the OEM portal.

Parts cross-reference

OEM part numbers with commonly-cited aftermarket equivalents. Verify against the nameplate and OEM parts portal before ordering — dimensionally similar filters can still be wrong for the application.

Air filter
Air filter
OEM
00521-088
Aftermarket
  • P181054— Donaldson
  • PA2848— Baldwin
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
Oil / fluid filter
Oil filter
OEM
00521-089
Aftermarket
  • P550425— Donaldson
  • LF3335— Fleetguard
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
Air-oil separator
Separator
OEM
00521-090
Aftermarket
  • P522449— Donaldson
  • OS 5205— Hifi
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.

Need to look up a number across all models? Use the parts cross-reference search.

Preventive maintenance
Daily
  • Check fluid level in sight glass at running temp
  • Listen for unusual noise / vibration
  • Check discharge pressure & temperature vs baseline
  • Verify condensate drain function
  • Log package amps if metered
Weekly
  • Blow down receiver and drain traps
  • Check for oil carryover at first drop leg
  • Inspect for fluid or air leaks around airend and separator tank
  • Verify safety valve is not weeping
Every 2,000 hr / 6 mo
  • Change fluid filter
  • Change air filter (or sooner per ΔP)
  • Sample fluid for TAN / metals / water
  • Clean cooler exterior with low-pressure air (never > 30 psi against fins)
Every 4,000 hr / 12 mo
  • Change separator element
  • Change fluid
  • Inspect scavenge line & orifice for coking
  • Check coupling / belt alignment & wear
  • Torque electrical lugs to spec (typ. 45–75 in-lb #4–2/0 AWG)
Every 8,000 hr
  • Rebuild inlet valve
  • Rebuild minimum-pressure check valve
  • Regrease or replace motor bearings per OEM interval
  • Verify safety valve setpoint against gauge
Common faults & first checks
  • High temp on cooler pluggage
  • Sep ΔP
Strengths
  • Custom-built configurations
  • US-manufactured (LaPorte, IN)
  • Solid airend engineering
Weaknesses
  • Custom builds → verify parts lead time on rare models
Field notes

Popular for custom-configured industrial installations.

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