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Preferred Utilities

Preferred Utilities engineers and fabricates fuel oil handling systems for diesel generators and dual-fuel fired boilers for mission critical facilities such as data centers, hospitals, and emergency response facilities. Our engineers specialize in mission critical fuel oil system design so they are current with the latest industry practices and fire protection codes. In addition, Preferred Utilities offers a wide variety of fuel oil system components designed to meet the unique requirements of our fuel oil customers. Preferred Utilities' industrial factory is located in Danbury, CT

Semi-Automatic Fuel Oil Transfer Pump Set

The Semi-Automatic Transfer Pump Set is a factory packaged, pre-engineered, pre-wired and pre-plumbed system that includes pumps, industrial motors and accessories.


SATPS systems are shipped to the job site requiring only external fluid and electrical connections ensuring undivided responsibility of delivering fuel at the selected flow. The Semi-Automatic Transfer Pump Set provides both manual “On” or “Off” operation or automatic operation in response to a “Call for Operation”.

  • Loop or Day Tank Fuel Oil Transfer System
  • No. 2 or No. 4 Fuel Oil
  • Flows From 20 to 2200 GPH
  • Industrial Type Cast Iron Gear Pumps
  • Factory Mounted and Wired Control Cabinet


The Semi-Automatic Transfer Pump Set is a factory packaged, pre-engineered, pre-wired and pre-plumbed system that includes pumps, industrial motors and accessories.

Motor Power: 120, 208, or 230 Vac 1 Phase or 208, 230, or 460 Vac 3 Phase

Control Circuit Power: 120 Vac 1 Phase.  Separate Feed is Required When Selected Motor Voltage is Other Than 120 Vac

Fluid: No. 2 or No. 4 Fuel Oil is Standard.  Consult Factory For Other Fuel Types

Pump: Bi-Rotational, Positive Displacement Type With Cast Iron Housings and Self-Adjusting Mechanical Seals

Motors: Base Mounted, Totally Enclosed Fan Cooled (TEFC)

Strainer: Simplex ½”, 1″, 1½”, or 2″ (according to inlet line size) Complete With 40 Mesh Basket


Standard Equipment Includes:

  • Two “Hand-Off-Auto” Switches
  • Two “Pump On” Indicators
  • “Lead Pump” Switch
  • “Power On” Indicator
  • Two Magnetic Motor Starters With Overload Protection
  • Two Motor Circuit Breakers
  • Two Pump & Motor Assemblies With TEFC Motors
  • Two Relief Valves, Two Check Valves and Four Ball Valves
  • Two Simplex Inlet Strainers
  • Inlet Compound Pressure Gauge
  • Discharge Pressure Gauges
  • Three Gauge Isolation Valves
  • Base Assembly


Piping And Mounting: Provide a duplex pump and straining set that is factory assembled with components piped and mounted on a continuously welded steel plate containment basin with 3″ steel side rails.   Provide a ½” containment basin plugged drain connection.  The basin shall be sized to contain (capture) potential leaks from all factory installed piping and components.  Pipe shall be schedule 40 ASTM A-53 Grade “A” with ANSI B16.3 Class 150 malleable iron threaded fittings.  Fuel Oil Transfer Pump and Straining Set shall be Preferred Utilities Mfg. Corp. Danbury, CT  Model SATPS-LO-____ rated at ___GPH of (No. 2), (No. 4), (Diesel) oil against a discharge pressure of ___psig.

Positive Displacement Pumps: Provide and mount two (2) positive displacement rotary type pumps with cast iron housing and self-adjusting mechanical, seals.  Pumps that have aluminum, brass, or bronze housings or rotors are not acceptable.  Packing gland equipped pumps, close-coupled pumps, Carbonator shaft mounted pumps or centrifugal pumps are not acceptable.

Motors: Provide and mount two (2) TEFC, rigid base, standard NEMA frame motors.  Pump and motor assemblies shall be factory assembled on a structural steel channel.  Rotating parts shall have a steel OSHA guard.

Pump Isolation and Check Valves: Provide and mount four (4) pump isolation valves.  Locate one (1) valve on the suction and discharge side of each pump.  Isolation valves must allow off-line pump maintenance without system loss of availability.  Isolation valves shall be ball type valves to provide full flow while open and positive shutoff when closed.  Additionally, two (2) check valves shall be provided and mounted, one (1) located on the discharge of each pump.

Fuel Oil Strainer: Provide and mount two (2) simplex strainers with 40 mesh baskets, one (1) located on the suction side of each pump.

Vibration Reduction For Fuel System Life Extension: Careful dampening of positive displacement pump vibration is vital to the long life of the pumps, motors, control switches and entire fuel handling system.  Pumps shall be connected to the piping via stainless steel flexible metallic braided jackets.  Additionally, the pump and motor shall be connected via an elastomeric jaw type flexible coupling.

Relief Valves: Provide and mount two (2) relief valves sized to relieve the full outlet flow of the pump without causing the pump motor to overload or any component’s pressure rating to be exceeded if the discharge is inadvertently valved off.   Relief valves must be externally mounted from the pumps and piped to the return line in the field according to NFPA 30.  Pump internal relief valves shall not be accepted.   Relief valves shall be Preferred Model R.

Compound And Pressure Gauges: Provide and mount a compound gauge on the suction side of the strainers.  The gauge shall read 30″ vacuum – 15 psig.  Provide and mount a pressure gauge on the discharge side of each pump.  Gauges selected must provide mid-scale readings under normal operating pressures.  Each gauge shall be equipped with an isolation ball valve.

Control Cabinet: Provide a completely pre-wired and factory tested control cabinet to ensure job site reliability. The pump set and control cabinet shall be the product of one manufacturer for single source responsibility. The control cabinet shall be constructed to NEMA 12/13 standards.  Doors shall be fully gasketed with a turned edge, piano hinges, and a three point lockable latching mechanism.  Cabinet interior shall be primed and finished in a white gloss, chemical resistant enamel.  Cabinet exterior shall be primed and finished in durable, chemical resistant, textured gray enamel, suitable for industrial environments. All control wiring shall be terminated at a numbered terminal strip to facilitate field connections to remote equipment.  All switches shall have maintained contacts. All cabinet front devices shall be identified by black phenolic labels with engraved white lettering.  Cabinet shall consist of, but not be limited to, the following:

  1. Magnetic motor starters with overload protection
  2. Motor circuit breakers
  3. “Hand-off-Auto” switch for each pump
  4. Pump Selector Switch for selection of Lead Pump
  5. Power on Indicating light
  6. Pump running Indicating lights

Quality Assurance: The Control Cabinet shall be manufactured and labeled in accordance with UL508A (CSA C22.2 #14 for use in Canada).  Simply supplying UL recognized individual components is not sufficient.  The assembled control cabinet, as a whole, must be inspected for proper wiring methods, fusing, etc., and must be labeled as conforming to UL508A.  Inspection and labeling shall be supervised by UL or other OSHA approved Nationally Recognized Test Lab (NRTL).   The system must be manufactured by a nationally recognized Trade Union (I.B.E.W. or similar trade union).  Lack of an NRTL certified UL508A wiring methods inspection and label or lack of a Trade Union label will be grounds for rejection.

Factory Testing: Pump Sets must be fully tested prior to shipment.  Testing shall include both a pressure and vacuum testing period.  First, the complete pump set shall be pressure tested to rated pressure using an air pressure source.  The test shall confirm that the pump set piping system can maintain rated pressure for 4 hours.  Next, the complete pump set shall be brought to a vacuum greater than 25″ Hg.  The test shall confirm that the pump set piping system can maintain vacuum for 4 hours.  Following a pressure and vacuum test the pump set shall be given a full operational test.  The pump set shall be connected to a fuel oil supply and return.  The pump set shall be operated normally.  Motor amps shall be noted at no load and full load for each motor.  The motor amps shall be within 10% of rated motor amps.  During the test, the relief valve shall be set and tested.  Operation of pump set instrumentation shall be tested.
A copy of the test procedures shall be sent to the consulting engineer and owner.  The owners and or the consulting engineer at their discretion shall observe this and all other tests.  A certificate of factory testing, together with a copy of the wiring diagram and arrangement diagrams shall be placed in the control cabinet prior to shipment.