Phillips Pump LLC

Use the following suggested specification in those mission-critical situations where (2) return pumps are required when the day tank is used for overflow, or where the main storage tank is above the day tank, grvaity feeds to the day tank, and the fuel must be pumped back to the main storage tank.

2.04  DOUBLE WALL FUEL OIL DAY TANK WITH RUPTURE CONTAINMENT

A.  Provide a ____ gallon double wall rectangular day tank with 135% outer rupture chamber constructed of reinforced 10 gauge steel, with channel side supports, 1" NPT drains for primary and secondary tank, 4" NPT inspection/emergency vent ports, visual fuel level gauge, vent cap, and a 2" lockable manual fill cap.  Tank interior shall be epoxy-coated and exterior shall be finished in an oil-resistant textured enamel.  Day tank shall be per UL 142 specifications as manufactured by Phillips Pump LLC, Bridgeport CT.

B.  Tank connections shall include 1" fuel inlets, 1" NPT engine supply and engine return ports, required vent openings, 2" NPT manual fill, and 1" overflow port.  Fuel oil supply inlet, engine return and engine supply ports shall have extended drop tubes to prevent surging in the day tank.

C.  Provide day tank level control probe arranged to monitor the fuel oil level.  Probe shall be designed for installation in the top of the tank to control high-high level alarm, lead return pump on, high level alarm / lag return pump on and return pumps off.

D.   Provide (2) fuel oil return pumps with a capacity of not less than  ___ GPM @ ___  PSIG discharge pressure when operating with diesel fuel.  Each pump shall be close coupled to a ____ HP, ____ RPM open drip-proof motor.

E.  Provide in secondary containment a rupture basin float switch with alarm and pump shut down which functions upon detection of oil in the rupture basin.

F.   Provide day tank-mounted system control cabinet to monitor and control the fuel oil delivery system in response to day tank demand.  Cabinet shall be completely pre-wired, tested and shipped as an integrated system to insure jobsite reliability and shall be capable of operating on ____ volt, ____ phase, 60 Hz electrical service.  Control strategy shall be microprocessor-based.   Enclosure shall be constructed of a minimum of 14 gauge steel, continuously welded and constructed to NEMA 1 standards.  Cabinet interior and exterior shall be primed and finished in a durable chemical-resistant enamel suitable for industrial environments.  PLC shall have sufficient I/O to accomplish all necessary control functions.  The control strategy shall be burned into an EPROM at the factory, and shall be safeguarded against re-configuration by unauthorized or unqualified personnel.  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:

• Microprocessor for pump control
• Magnetic motor starter for each pump
• Motor circuit breaker for each pump
• Manual-Off-Auto illuminated mode selector switch for each pump
• Press to test button for all alarms and indicating lights
• Alarm silence / System reset and system test push-buttons
• Alarm buzzer
• Discrete output for common alarm to interface with the BMS
• System indicating alarms as follows:
  • (1) Power on light
  • (1) Day tank high level alarm
  • (1) Day tank high-high level alarm
  • (1) Day tank rupture basin leak detected alarm

Operation:  As the fuel overflows into the tank and the level rises, the return pump shall engage when the lead return pump on float makes on rise.  The lead return pump shall remain engaged until the return pump off float breaks on drop.  The system will automatically alternate return pumps upon each successive demand call of the tank.  If a return pump is removed for service or turn off, the system shall automatically select the opposite return pump when called to engage.

High Level Alarm / Lag Return Pump On:  If the fuel level continues to rise in the day tank while the lead return pump is engaged, the lag return pump on float will make on rise and the system will engage the lag return pump.  The alarm will sound and the system will display a high level alarm condition.

High-High Level Alarm:  If fuel continues to rise in the day tank, the high-high level float will make on rise, the system will sound the alarm and display a high-high level warning.

Rupture Basin Leak Detected: If the rupture basin leak sensor located in the day tank's rupture basin detects fuel, the system will sound the alarm and display a overflow tank rupture basin leak warning.