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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

Fuel Oil Day Tanks

The Model DT Day Tanks provide a local supply of distillate or diesel fuel for boilers, emergency generators or other stationary engine driven or oil fired equipment.

Application

For mission critical applications such as emergency diesel generators and dual-fuel boilers, it is recommended that at least four hours worth of fuel is immediately available to the unit without activating transfer pumps.

The Model DT Day Tanks provide a local supply of distillate or diesel fuel for boilers, emergency generators or other stationary engine driven or oil fired equipment.  Available from 20 to 620 gallon capacities, a properly sized tank may be selected per individual job.  For maximum fuel capacity in a minimum space, Preferred Day Tanks are rectangular in shape. Each Day Tank unit includes all necessary pipe connections, inspection port, manual fill port, and tank gauge, along with a variety of optional accessories.

Features

  • Includes Rupture Basin And Instrumentation
  • 20 To 620 gallon Capacity Range
  • UL Approved, NFPA 30 Compliant

Overview

Tank Designs

Mounting Base:  Structural Steel Channel

Metal Thickness:  10 Gauge

Exterior Finish: Chemical Resistant Gray Enamel, Rust Resistant Primer

Manual Fill Port: 2″ NPT

Inspection Port:  6″ Square Gasketed Plate

1″ NPT Pipe Connections: Tank Fill, Engine Fuel Return, Overflow to Storage Tank, Engine Fuel Supply, Plugged Drain

Vent Connections: Top Mounted; 2″ – 20-60 Gallon, 3″ – 80-190 Gallons, 4″ – 220 Gallons And Over

Approvals / Compliance:  UL Approved, NFPA 30 compliant

Optional Rupture Basin Specifications

Mounting Base: Structural Steel Channel

Containment: 160% Of Tank Capacity Standard

Leak Detector:  Preferred RBS Float Switch

Metal Thickness: Same As Companion Tank

Turned Edge Reinforcement

Finish: Chemical Resistant Gray Enamel Finish, Rust Resistant Primer.

Drain: Plugged 1″ NPT Coupling

Approvals / Compliance:  UL Approved

Specification

Day Tank System Construction: Provide one (1) ___ gallon, UL 142 labeled Day Tank constructed of reinforced 10 gauge steel with channel side supports, 1″ drain, removable gasketed 6″ square inspection plate, fuel level gauge, level control probe, vent cap (shipped loose), and a 2″ gasketed manual fill cap.  Exterior shall be finished in an oil resistant  textured gray enamel.  Day Tank(s) shall be as supplied and coordinated by the Pump Set manufacturer.  The Fuel Oil Day Tank shall be manufactured by Preferred Utilities Mfg. Corp. Danbury, CT, Model DT.

Tank Connections: Tank connections shall include fuel inlet, required vent openings, manual fill, overflow to main tank, engine supply, and engine return.  All piped with reinforced, welded pipe adapters.  Fuel fill, inlet and return must be supplied with factory installed drop tubes to prevent surging and foaming in the day tank.

Rupture Basin: Rupture Basin (indoor applications only): The Rupture Basin shall consist of an open-top, welded heavy gauge steal structure sized a minimum of 160% capacity of tank capacity.  Rupture Basin (outdoor applications): The Rupture Basin shall consist of a welded steel top, welded heavy gauge steal structure sized a minimum of 160% capacity of tank capacity.  Exterior shall be finished in an oil resistant, textured gray enamel.  Provide and factory install a rupture basin leak detector for alarming and fuel supply pump shut down.  Electrical connections shall be contained in a weatherproof junction box.  Switch shall be a Preferred Model RBS.

Level Controls: Level Controls shall have four (4) float operated switches rated at 100 watts and factory installed in the day tank.  Levels of control: emergency high-level alarm and total pump shutdown (90% capacity), pump off (80% capacity), pump on (50% capacity), and emergency low-level secondary pump on and annunciation (40% capacity).  Unit shall be suitable for pressures to 150 psi, and shall be made entirely of non-ferrous material.  Electrical connections shall be contained in a weatherproof junction box.  Level Control shall be Preferred Model PLS-xx-4.

Factory Testing: Fuel oil storage tank and day tank hydrostatic testing is required to ensure tightness prior to shipment.  The minimum pressure for testing the tank shall be five (5) psi.  The hydrostatic pressure shall be maintained until all joints and connections have been visually inspected for leaks, but in no case for less than one-half hour.  The tank shall not show any permanent deformation as a result of the test.  The Rupture basin (open top) shall be hydrostatic tested prior to shipment.  The basin shall maintain a full water level while all joints and connections are visually inspected for leaks.  The test shall be run for no less than one-half hour.  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.