The following is a suggested specification:
2.01 DUPLEX PUMP SET:
A. Provide and install a factory assembled
"Packaged" Duplex Fuel Oil Pump Set. The set shall have all
components mounted on a steel base support fabricated of 3/16" steel plate
with 3" steel side rails sealed to form a containment basin with 1/2"
NPT plugged drain connection. Containment basin shall encompass the entire
perimeter of the duplex pump set and no components or factory piping shall
overhang. Pipe shall be schedule 40, ASTM Grade A-53 black steel pipe with
A-105 forged steel socket welded fittings and A-105 150# forged steel flanges.
Systems assembled with threaded fittings and unions will not be acceptable.
Provide a leak sensor in the pump set containment basin to shut off the pumps
and energize an audible and visual alarm should a leak be detected. The level
sensor shall be a normally closed float switch with covering shroud to protect
switch from damage or accidental tripping. System shall be D series as
manufactured by Phillips Fuel Systems, Bridgeport Ct., (203-908-3323) with options listed or approved equal.
B. Provide one Phillips series MOD 72 UL listed (1) duplex
oil strainer, sized to produced less than 1/2 PSI pressure drop, through a
clean brass strainer basket with the maximum anticipated flow. Strainer shall
be of one-piece cast iron and come complete with level wrench handle. A
differential pressure gauge shall be shall be provided to monitor strainer
basket cleanliness shall include visual indication of clean, change required
and dirty strainer.
C. Provide two (2) Phillips GP series direct coupled fuel oil
pumps with ductile iron housing and self adjusting mechanical viton seals, each
with a capacity of not less than ___ GPH @ __ PSIG discharge pressure
when operating with No. 2 oil. Each pump shall be close coupled to not less
than a ___ HP, 1725 RPM totally enclosed fan cooled motor, capable of operating
on ___ volts, __ phase, 60 HZ electrical service.
D. Provide two (2) external bronze body fuel oil pump relief
valves in each pump discharge line sized to relieve full 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 shut off. Valves shall be
piped from the system to the return line in the field according to NFPA
30. Pumps with internal relief valves are not recommended.
E. Provide “bubble tight” bronze body in-line check valves on
the suction and discharge side of each pump.
F. Carbon steel ball valves, class 150 flanged, shall be
provided on both the suction and discharge of each pump to provide pump
isolation for service. Valve shall include lockable handle so a padlock can be
applied to prevent accidental closing or opening if pump is removed from
G. A (2) 4" compound gauge shall be provided
on the suction and discharge side of the duplex strainer. Gauge shall be liquid
filled to dampen pulsation, with bright finish stainless steel case, brass
movement, and bronze bourbon tube. Gauge shall read 30" vacuum - 30
psig and shall be mounted with isolation ball valve.
H. A 4" dial pressure gauges to be placed on
discharge side of each pump. The gauges shall be liquid filled to dampen
pulsation, have bright finished stainless steel case, brass movement and bronze
bourbon tube. Gauge range shall be based on the fuel oil system operating
pressure and shall be mounted with isolation ball valves.
I. Provide a Phillips FL series time
delayed flow sensing switch on the discharge of the pump set to bring on the
lag pump should the lead pump fail to maintain flow. Flow switch shall be
piston type operated to actuate a single double throw snap switch. Switch will
be wired back to the main control cabinet for alarm and annunciation for lead
J. Install in the oil return line a Phillips RVI series
back-pressure regulating valve with viton diaphragm and disc, to maintain a __
to __ PSI pressure range.
K. Provide where shown in the fuel
oil supply line Phillips HFMS series quick closing, spring loaded lever gate
fire valves with fusible link arranged so that the valve will automatically
close if the link melts or if the valve shall receives a normally open switch
closure from a thermally actuated fire
indicating safety switch. Valve
shall be equipped with an end switch to interface with the fuel oil management
L. Provide pump set mounted system control cabinet with fused
main disconnect switch to monitor and control the fuel oil delivery system in
response to system demand. Cabinet must
be labeled as conforming to UL508A and shall be completely pre-wired, tested
and shipped as an integrated system to insure jobsite reliability. Control
strategy shall be microprocessor based and utilize a PLC (Programmable Logic Controller).
Relay logic is not acceptable. Cabinet enclosure shall be constructed of a
minimum of 14-gauge steel, continuously welded and constructed to NEMA 3R
standards. Cabinet interior and
exterior shall be primed and finished in 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 un-authorized / un-qualified
personnel. Each pump shall be capable of manual operation in the event of a
controller failure. Cabinet shall
consist of but not be limited to the following:
based PLC with automatic pump alternation mode selection
- Self-protected magnetic motor starters with adjustable overload protection
- Manual-Off-Auto illuminated mode selector switch for each pump
silence / system reset push-button
logic to engage pump set from a multiple dry contact input for remote
logic to start lag pump if lead pump fails to establish or maintain flow in
- Back-lit 4 line LCD display factory
programmed for system status and alarm
general alarm output dry contact to interface with the building management system
- Direct modbus protocol communication ports.
The control system
shall automatically energize the lead pump at a time period as set by the
system operator (1-24 hours) to verify suction piping integrity, pump prime and
verify pump operation. Each pump shall
be engaged and if either lead or lag pump fails any of these tests, the control
system shall generate an audible and visual alarm to indicate a flow lost
The system controller shall include a LCD display for
pump set status, alarm listings, and trouble shooting functions. The display page shall be provided
for viewing the most recent alarms/events with each event and alarm condition
time and date stamped. The control system shall monitor or annunciate the
following: Pump elapsed run time (each); Pump set leak; Pump flow failure
(each); Containment piping leak; Clean Strainer basket; Fuse valve closed; Main
Tank Leak; Main Tank Low Level; Main Tank High Level; Emergency Shut Down; Pump
Overload Trip; Fire Valve Closed; Pump Not-In-Auto