Specifications for Fuel Day Tank
with Supply Pump and Motor
(Supply and Install)
VA Connecticut Healthcare System
The contractor shall supply and install (2) two new emergency generator day tanks as described within the attached specification at the VA Connecticut Healthcare System located at 555 Willard Avenue, Newington, CT
These specifications describe requirements for a fuel day tank System consisting of one or more fuel tanks, an Electronic Control Module (ECM) and fuel supply pumps sized to support the generator set. The Fuel Day Tank System shall automatically maintain fuel levels specified within.
The manufacturer shall design and furnish all materials and equipment to be fully compatible with electrical, environmental and space conditions of the site. It shall include all equipment to safely support the full demands of the generator set and be designed for unattended operation.
1.2 CODES AND STANDARDS
1.2.1 The fuel day tank and all associated equipment and components shall be manufactured in
accordance with the following applicable standards:
The Day Tank and all associated equipment and components shall be manufactured in accordance with
the following applicable standards:
UL-142 Above Ground Flammable Liquid Tanks
CAN/ULC-S601-07 Steel Above Ground Tanks for Flammable and Combustible Liquids
UL-508 Industrial Control Equipment (ECM)
American Welding Society (AWS) - Welders certified AWS standards D 1.1 / D 1.1M
1.2.2 The installing contractor shall be an experienced firm regularly engaged in the installation of fuel
day tanks and fuel piping systems, and be responsible to conform to the requirements of the codes and
standards, as applicable. The fuel day tank shall be manufactured to allow the necessary features to
meet the requirements of these standards.
NFPA 30 - Flammable and Combustible Liquids
NFPA 37 - Standard For the Installation and Use of Stationary Combustion Engines and Gas
NFPA 70 - National Electrical Code. Equipment shall be suitable for use in systems in
compliance to Article 700, 701, and 702.
NFPA 99 - Essential Electrical Systems for Health Care Facilities
NFPA 110 - Emergency and Standby Power Systems.
1.3 ACCEPTABLE MANUFACTURERS
Only approved bidders shall supply equipment provided under this contract. Equipment specifications for this project are based on microprocessor-based fuel day tanks specification.
A. Shop drawings:
1. Outline drawings of assembly.
2. One line diagrams and wiring diagrams for assembly and components.
B. Product data:
1. Technical data on all major components.
C. Project information:
1. Test reports and certifications.
2. Factory test procedures.
The fuel day tank manufacturer shall be certified to ISO 9001 International Quality Standard and
shall have third party certification verifying quality assurance in design/development, production,
installation and service, in accordance with ISO 9001.
The manufacturer of this equipment shall have produced similar equipment for a minimum period
of ten years. When requested by the engineer, an acceptable list of installations with similar
equipment shall be provided, demonstrating compliance with this requirement.
Production pressure test shall be performed by the manufacturer on each tank prior to shipping in
accordance with prevailing standards of UL-142 and CAN/ULC-S601-07. These tests are
intended to verify compliance with production requirements of the standard for leakage. The test
is to be conducted before painting the tank by applying an internal air pressure and using soap
suds, or equivalent material, for the detection of leaks. For a horizontal or rectangular tank, the
test gauge pressure is to be not less than 3 psi (21 kPa). If a leak should be detected during
production testing, the leak shall be repaired. Tanks shall be retested until zero leaks are
apparent during two (2) successive test periods. A record of the manufacturer's testing shall be
permanently maintained and available to the end user or customer.
The installing contractor must have a minimum of five (5) years' experience in the design,
installation and testing of fuel day tank systems. A list of systems of a similar nature and scope
shall be provided on request.
The installing contractor shall test the system during start-up to assure the overflow line transfers
an overflow through continuous piping, without valves or traps, back to the source tank or to a
The installing contractor shall test the system during start-up to assure the return pump system
will move fuel overflow back to the source tank or to a collection system.
The manufacturer shall warrant the material and workmanship of the fuel day tank for a minimum
of one (1) year from date of shipment.
The manufacturer of the fuel day tank(s) shall offer an extended coverage (years 2 - 5)
Fuel Day Tank capacity shall be based on NEC 2011, NFPA 70, Article 701.12 (B) (2) where internal
combustion engines are used as the prime mover, an on-site fuel supply shall be provided with an on premise fuel supply sufficient for not less than two (2) hours of full-demand operation of the system. The day tank shall be sized in accordance with these standards and the capacity shall not be less than ___2 gallons.
Fuel Day Tank shall be made of heavy gauge steel construction. Tank shall include removable, welded steel top cover for indoor applications, Tank shall be coated with rust inhibitor within inner tank, primed and finish painted on external tank with epoxy paint. The installing contractor shall provide schedule 40, ASTM A 53, black iron pipe connections to the day tank fittings. All connections to be made with pipe unions to facilitate tank service/removal.
The tank shall include at a minimum the following fittings:
o 1" NPT engine supply
o 1" NPT engine return
o NPT fitting for emergency vent, sized per the requirements of NFPA 30 and UL-142/ULC-S601
o 1" NPT overflow.
o 2" NPT normal vent
o 4 ½" square inspection port below electrical controls
The tank shall be provided with atmospheric (normal) vent cap with screen and emergency pressure relief
vent sized per the requirements of NFPA 30 and UL 142 / ULC S601.
Emergency vent cap shall be spring-pressure operated. Opening Pressure shall be 0.5 psig; full opening
pressure 2.5 psig. Flow rate shall be marked on top of each vent.
2.3 DESIGN REQUIREMENTS
2.3.1 Fuel Day Tank Control, Alarm and Status Display.
The microprocessor-based electronic control module (ECM) shall be specified for control of redundant pump operation. Where power is needed for the operation of the fuel transfer pumps to deliver fuel to a generator set day tank, the pumps shall be connected to the legally required standby power system. The ECM shall receive a signal from a single electrical analog float sensor. The ECM shall be provided with the following indications: fuel level, alarm, function, and existing warning and shutdown conditions and be located within a Type 1 zinc-plated enclosure for indoor use. The lamps shall be high-intensity LED type. The lamp condition shall be clearly apparent under bright room lighting conditions. All warnings shall be
provided with normally open and normally closed, dry contacts for remote annunciation (3 amps @ 120
Unit Kw Tank Size GPM for Tank Pump
#7 295 100 2 GPM
#9 500 150 4 GPM
2.3.2 Fuel Level Display
Full - 100% Green LED Indicator
95% - Green LED Indicator
85% - Green LED Indicator
75% - Yellow LED Indicator
50% - Yellow LED Indicator
25% - Yellow LED Indicator
10% - Yellow LED Indicator
Empty - 6% - Red LED Indicator
2.3.3 Alarm Display
High Fuel - 106% or greater of Capacity
Low Fuel - 62% of Capacity
Critical Low Fuel - 6% of Capacity
Fuel within Containment
ECM Functional - Tank Fault
2.3.4 Function Display
Power on - This button activates the ECM after the Off button has been depressed. On any
initial power up condition, after a power outage, the ECM shall be in an on condition.
Pump running - For redundant pump operation fuel pump control panel shall indicate Pump A or
Pump B running. Pump running relay shall provide local contacts for remote monitoring,
indicating pump is running.
2.3.5 Remote Contact Connections
Tank Fault (ECM Functional)/Fuel in Containment (Shared)/Loss of Power
Critical High Fuel - 106% or greater of capacity
Pump Running Option - Indicating supply pump is in operation
High Fuel - 106% of capacity
Low Fuel - 62% of capacity
Critical Low Fuel - 6% of capacity
On - Power available to ECM
Off - Turns off power within ECM
Test - Shall force supply pump(s) to operate at time of start-up to verify overflow return line has
been piped correctly and that there are no leaks within the system.
2.3.7 Start-up test switch shall test contacts for high, low, critical low, ECM functional and containment
switch to assure wiring of remote contacts is correct.
2.3.8 Critical high-level automatic discrete shutoff switch shall stop supply pump delivery to the fuel day
tank at the tank critical high liquid level. The critical high-level fuel switch shall be hard-wired to override
any other alarms or signals received by the ECM.
2.4 PUMP OPERATION
2.4.1 For redundant pump operation two supply pumps and motors are supplied and the pumps shall alternate as the lead when refueling day tank. The lead pump shall activate when fuel level decreases to 87% of capacity; the lag pump shall activate in tandem with the lead pump if the fuel level decreases to 75% of capacity. The supply pump operation shall stop at 100% of tank capacity. The pumps shall provide a minimum of 17 feet of vertical lift at sea level. Appropriately sized check valves with fuel strainers shall be provided on the pump fuel inlets. The lead pump shall be sized to accommodate the Three Emergency/Standby Power System Generator Set and be supplied as:
o Two (2) quantity - 2 GPM pumps with 1/3 HP, 115 VAC, 1 phase 60 Hz, thermally protected
motors. For GB 7 and 9 each.
o Two (2) quantity - 4 GPM pumps with 1/3 HP, 115 VAC, 1 phase, 60 Hz, thermally protected
motors for GB-10
2.5 FUEL CONTAINMENT
The fuel day tank shall include a welded steel containment basin to prevent escape of fuel in the event of a tank rupture, sized at a minimum of 150% of the tank capacity. The basin shall be primed and finish painted enamel.
2.5.1 Indoor containment basin: The basin shall consist of an open-top, welded heavy gauge steel structure. Leak detection switch shall be wired into the electronic control module (ECM). This will shut down the supply pump and motor in case of a fuel leak into the containment basin with an emergency pressure relief vent sized per the requirements of NFPA 30 and UL 142 / ULC S601. Emergency vent cap shall be spring-pressure operated. Opening pressure shall be 0.5 psig; full opening pressure shall be 2.5 psig. Limits shall be marked on top of each vent. Leak detection switch shall be wired into the electronic control module (ECM). This will shut down the supply pump and motor in case of a fuel leak into the containment basin.