1.00 General These specifications provide a single source
responsibility for the manufacture, testing, and warranty of a prefabricated,
skid-mounted, fully automatic pump system for irrigation.
The pump system shall conform to the following specifications in all respects. This specification covers minimum requirements only. It is not to all-inclusive. Refer to the Technical Data Sheet for specific station features. It is the responsibility of the successful vendor to provide all necessary appurtenances that are required for a reliable, automatic pump system. The manufacturer shall supply documentation to include a general layout drawing, electrical power schematic, and control schematic as part of the owner’s manual.
1.10 Manufacturer The pump system shall be manufactured by RainMaker, of Lexington, SC, USA 803-461-0567, or approved equal as determined by the purchaser prior to bid opening. Exact information such as model number, capacity, and special features shall be listed on the attached technical data sheet. For consideration of a proposed equal system, the contractor shall furnish the following data to the specifier at least 10 days prior to the date of the bid opening:
• A complete specification for the pumping system proposed as an equal.
• A statement of full conformance to the following specifications signed by an officer of
the manufacturer.
• A general arrangement drawing showing overall dimensions and all piping layouts.
• Complete submittal data for all major equipment (pumps, motors, control
components, valves, and motor starters).
• An electrical schematic showing power wiring.
• Manufacturer’s electrical control panel UL file number.
• A copy of manufacturer’s certificate of insurance showing as a minimum, a general
liability coverage of $1,000,000 and an excess liability coverage of $2,000,000.
If in the opinion of the purchaser, the data submitted shows the pump system to be an equal to the system specified, the bidding contractors shall be notified not less than 7 days prior to the bid opening.
Part 2 – Mechanical
2.00 Scope The pump system shall be completely skid-mounted and built by a single manufacturer. All equipment including, but not limited to, pumps, motors, valves, controls, and instrumentation shall be mounted on a common steel base to form a complete, operating pump system.
2.10 System Base The system base shall be designed and fabricated to provide proper structural support for all of the attached equipment. The base shall supply sufficient rigidity to withstand reasonable and competent transportation to the site, off-loading, installation, and operation. It and all appurtenant fixtures shall be manufactured from structural aluminum material.
2.20 Piping All pipe fittings shall be threaded standard weight galvanized malleable iron and all nipples shall be of brass construction.
2.30 Station Enclosure If equipped, the station shall be
provided with an all aluminum enclosure that features removable panels that
provide access to the pump, control panel, and tank (if equipped). The enclosure shall be manufactured from
.063” aluminum material with a baked-on enamel finish with a 1000-hour salt-spray
rating.
2.40 Bolts All bolts used shall be chrome-plated for corrosion
prevention. The bolts shall meet
SAE-J249 Grade 5 and ASTM A449 specifications.
2.50 Pump The station shall utilize one (1) pump that is a horizontal end
suction centrifugal pump (standard or self-priming). The pumping unit shall be
designed and furnished in accordance with the latest Hydraulic Institute
specifications for centrifugal pumps.
The pump
shall be of back pull-out design to allow access to the impeller without
disturbing the piping. The casing/volute
shall be manufactured of ASTM A48 class 25-35 cast iron and precision
machined. It shall also feature at
least one tapped and plugged drain connection.
The
enclosed type impeller shall be constructed of ASTM A48 cast iron, ASTM B584
silicon bronze, or polycarbonate as stated on the attached technical data
sheet. The impeller diffuser shall be
constructed of cast iron.
The shaft
sleeve shall be constructed of ASTM A581-582 Type 303 stainless steel.
The
mechanical seal shall be constructed of 316 stainless steel metal parts, a Buna
N bellows, a ceramic stationary face, and a carbon rotating face.
2.60 Motor Electric motors shall be NEMA JM, JP, or C face ODP design with
200 degree C rated, high efficiency, moisture resistant copper windings
impregnated with high temperature polyester insulation resin. Motors shall have locked-on shaft end
bearings and be rated for continuous duty.
2.70 Valves All valves shall be sized to provide the required flow and as
specified in the following.
2.71 Pump Check Valve A check valve shall be installed on the pump
discharge to prevent reverse flow and to protect the foot valve (if
present). The valve shall be a
spring-loaded poppet style valve. It
shall be of silicon bronze construction with a Buna O-ring and stainless steel
hardware.
2.72 Pressure Sustaining Valve A pressure sustaining valve shall be
installed if required. It shall be a
hydraulically operated and pilot controlled to accurately maintain a constant
preset upstream pressure regardless of upstream potential or system
demand. The valve body and cover shall
be of ASTM A126 Class B cast iron that are coated internally and externally by
fusion bonding with a polyester coating.
It shall be sized to pass the required flow with no more than 8.0 psi
pressure drop as recommended by the manufacturer.
2.73
Pressure Regulating Valve If equipped, the pressure sustaining valve (see
Section
2.72) can also be outfitted with a pressure reducing pilot to accurately
maintain a constant preset downstream pressure regardless of changing upstream
pressure or flow.
2.72 Station Isolation Valve An isolation valve shall be installed
downstream of the check valve. The
isolation valve shall be a full port ball valve. It shall be of bronze construction with a chrome-plated brass
ball.
2.80 Pressure Gauge All gauges shall be silicon filled to reduce
wear due to vibration. Accuracy shall
be within 2%. Range shall be at least
30% higher than the highest pressure attainable from the pump at shutoff head
conditions. Gauge shall have a
stainless steel back and bronze internals.
2.90
Bladder Tank
If equipped, the pump station shall feature a pre-charged
hydropneumatic
tank with replaceable heavy-duty vinyl bladder. It shall have a maximum working pressure of 100 psi. The tank shall have a .302” – 32 charging
valve connection (standard tire valve) to facilitate the on-site charging of
the tank to meet system requirements.
The tank shall have a base with large openings for easy access and
ventilation to prevent moisture accumulation.
The tank shall have a baked polyester exterior finish.
Part 3 –
Electrical
3.00 Scope The electrical hardware shall provide complete instrumentation
and control that can start and stop the pump and provide smooth, efficient, and
reliable flow rates. A low pressure
safety and no flow safety (on master valve start models) shall be included to
protect the equipment at all times.
3.10 Control Enclosure All controls shall be housed in a NEMA 4
enclosure with integral latches. It
shall be of sheet steel construction with a minimum 16 gauge housing and 14
gauge door. The housing and door shall
have an electrophoretic dip-coat priming and powder finish. The removable back plate shall be of 12
gauge steel that is zinc-coated. All
indicator lights, reset buttons, and selector switches shall be mounted on the
front of the enclosure door and also rated to NEMA 4. All internal components shall be mounted on the back plate.
3.20
Main Disconnect A main disconnect shall be mounted on the outside of the
enclosure. This will completely disconnect the incoming
power when in the “OFF” position. The
main disconnect will be a 3 pole circuit breaker or a fusible disconnect with
fuses of the appropriate amperage that shall protect the motor.
3.30 Control Power A control power transformer shall be provided with primary
and secondary fuses for protection per National Electric Code (NEC). The control power will be used only for the
internal loads.
3.40
Motor Starting Equipment The motor starter shall be full voltage, across-the-
line type
with an overload relay. The overload
relay shall detect loss of voltage, voltage imbalance, shall be rated to
protect each leg, and set at 100% of the motor nameplate amperage.
3.50 Controls The panel controls shall consist of timers, switches, pilot
lights, power supplies, and relays.
3.60 Pressure Switch The pressure switch shall be a bellows type
that activates a
snap
switch at a preset pressure. The switch
shall be rated for 10 amps at 250 volts and shall be double pole, single
throw. It shall have a rating of 200
psi and shall operate at 30% and 80% of the switch rating. The switch shall have an adjustable
differential of 20 to 40 psi.
3.70 Flow Switch The flow switch shall be a paddle type with
a NEMA 4X enclosure. The switch is
rated for 240 volts AC switching.
3.80 Safeties The panel shall
include the following safeties:
3.81 Lightning and Surge Suppressor If equipped, all electrical components
shall be protected by a parallel configured, 80kA per phase, 40kA per mode
Multi-Circuit Transient Voltage Surge Suppressor (MCTVSS) with remote alarm
capability. Internal fusing is
optional. The MCTVSS shall be UL listed
and shall meet Categories C, B, and A.
3.82
Low Pressure If
equipped, a low pressure safety circuit shall shutdown the
pump
station if the pump pressure drops below a predetermined setpoint for more than
a specified period of time. An
indicator light shall illuminate if the low pressure safety shall occur. The pump station shall be manually reset
before it can operate again. The pump
station shall have a manual override to bypass the low pressure safety.
3.83
High Pressure
If equipped, a high pressure safety circuit shall shutdown
the
pump
station if the pump pressure rises above a predetermined setpoint for more than
a specified period of time. An
indicator light shall illuminate if the high pressure safety shall occur. The pump station shall be manually reset
before it can operate again. The pump
station shall have a manual override to bypass the high pressure safety.
3.84
No Flow If
equipped, a no flow safety circuit shall shutdown the pump
station if
the flow stops for more than a specified period of time. An indicator light shall illuminate if the
no flow safety shall occur. The pump
station shall be manually reset before it can operate again. The pump station shall have a manual override
to bypass the no flow safety.
3.85
Low Level If
equipped, a low suction level safety circuit shall shutdown the
pump
station if the level in the suction reservoir drops below a set level. An indicator light shall illuminate if the
low level safety shall occur. The pump
station shall be manually reset before it can operate again. The pump station shall have a manual
override to bypass the low level safety.
3.90 Skid Wiring The manufacturer shall be responsible for all wiring internal
to the
control
panel and wiring between the starter and the motor. The owner shall be responsible for all other wiring.
3.100 Codes
The control panel shall be a UL listed industrial control
panel. A UL
label
shall be applied to the door of the control panel. A wiring diagram shall be included in the control panel. All wiring between the starter and the pump
shall be in accordance to NEC. The main
disconnect shall be interlocked with the door of the control panel.
Part 4 –
Run Testing
The pump
system shall be completely run tested prior to shipment to verify the
performance. Actual pump shutoff head
shall be included on the Technical Data Sheet provided with the owner’s manual
at delivery.
Part 5 –
Warranty
The
manufacturer warrants for a period of one (1) year from date of invoice
equipment furnished will be of merchantable quality, free from defects in
material, workmanship, and design (except as where design is of or by others)
each as determined by RainMaker (hereafter referred to as “Manufacturer”) in
respect to generally recognized, applicable, and accepted practices and procedures
in the industry.
Components
used by the Manufacturer but manufactured by others, are warranted only to the
extent of that manufacturer’s guarantee.
Liability
under this warranty is limited to replacement or repair of defects or
correction of design at our factory in Lexington, South Carolina, U. S. A.,
with transportation prepaid by buyer.
Satisfaction of this warranty, consistent with other provisions herein
may at the option of the Manufacturer be performed at the jobsite provided that
the buyer shall pay all transportation, travel, and associated labor expenses
(i.e., removal or replacement of parts).
The Manufacturer uses only high quality material. As with any mechanical or electrical device,
some preventative maintenance efforts are required to enhance service
life. The customer is encouraged to
establish a methodical maintenance service program to avoid premature
failure. The Manufacturer offers
support services and recommends their use.
Because of varied conditions beyond the control of the Manufacturer,
this warranty does not cover damage under the following conditions or
environment unless otherwise specified in writing.
1.
Default of any agreement with the Manufacturer.
2.
Misuse, abuse, or failure to conduct routine maintenance.
3.
Handling any liquid other than irrigation water.
4.
Exposure to electrolysis, erosion, or abrasion.
5.
Presence of destructive gaseous or chemical solutions.
6.
Overvoltage or unprotected low voltage.
7.
Unprotected electrical phase loss or phase reversal.
The foregoing constitutes the Manufacturer’s sole warranty
and has not nor does it make any additional warranty, whether express or
implied, with respect to the pumping system or component. This warranty is in lieu of all other
warranties, expressed, implied, or statutory including implied warranties of
merchantability or fitness and hereby excludes certifications or the like for
equipment performance, use, or design with respect to any standard, regulation,
specification, or the like and extends only to buyer or customer purchasing
from the Manufacturer.
The Manufacturer shall not be liable to purchaser or any
other person for any liability, loss, or damage caused or alleged to be caused
directly or indirectly by the pumping system.
In no event shall the Manufacturer be responsible for incidental,
consequential, or act of God damages nor shall Manufacturer’s liability for
damages to purchaser or any other person ever exceed the original factory
purchase price.
Other than the warranties contained herein, there are no
warranties of merchantability or of fitness for a particular purpose given by
implication or expressly in connection with the equipment sold.