Direct Wired, Tethered Float
Oil-Minder® Specification
Dwg: / DS-B13-015 / Rev: / Date: / 5/17
STANCOR
SCOPE
The contractor shall furnish and install a Stancor Model SE-50-ELV complete pump and Oil-Minder® control system for each elevator pit, as shown on the drawings. The system shall be capable of pumping water while containing oil. The pump and oil sensor technology control system shall comply with ASME 17.1 standards. The system shall function automatically without human intervention. In addition, the system shall provide separate alarms in the event of an oil spill, high liquid level condition, or overcurrent condition due to a pump fault. All controls shall be UL 508a approved. All components of system shall be UL approved. Pump shall be approved to UL 778 and/or CSA C22.2.
PUMP DESIGN
The motor shall be rated ½ H.P., 1 phase, 60 Hertz, 115 volts. Maximum running amp draw of 8 at 115 volts. The pump shall be designed to handle without clogging clean water, contaminated water, wastewater effluent, storm water, and other similar liquids that may contain small solids. The pump shall have integrated feet allowing it to stand on a hard bottom wet well.
PUMP CONSTRUCTION
Major pump components shall be made from Stainless Steel 304 and FC-20 Cast Iron, with smooth surfaces devoid of porosity or other irregularities. All exposed fasteners shall be AISI type 316 stainless steel. Critical mating surfaces, where a watertight seal is required, shall be machined and fitted with Nitrile (Buna N) o-rings. Sealing will be the result of controlled compression of rubber o-rings without requiring a specific torque on fasteners to accomplish sealing. Rectangular cross sectioned gaskets, requiring specific fastener torque to achieve compression, shall not be considered adequate or equal. No secondary sealing compounds shall be used or required.
Impeller: The impeller shall be a non-clogging, dynamically balanced, vortex design, capable of passing a 35 mm diameter spherical solid. The impeller shall be threaded onto the motor shaft and shall be fastened to the shaft by a stainless steel impeller nut. The use of adjustable bottom plates to maintain efficiency shall not be considered equal.
Pump Volute: The pump volute shall be a single-piece design with vertical discharge. Passages shall be smooth and large enough to pass any solids that may enter the impeller. Volute inlet opening shall be 35mm. Discharge design shall permit attachment to standard 2” NPT pipe fittings.
Shaft & Rotating Assembly: The common motor/pump shaft shall be of Stainless Steel (410) material that is in contact with pump’s mechanical seals and shall have a polished finish and accurately machined shoulders to accommodate the bearings, seals and impeller. Carbon steel shafts shall not be considered adequate or equal. The rotating assembly (impeller, shaft and rotor) shall be dynamically balanced such that undue vibration or other unsatisfactory characteristics will not result when the pump is in operation.
Triple Seal System: Each pump shall be equipped with a tandem mechanical shaft seal system consisting of two independent seal assemblies with a common spring between them and a radial lip seal; providing three complete levels of sealing between the pump wet end and the motor. The mechanical seals shall operate in an oil filled chamber which is completely separate from the motor chamber. The seal faces shall be Silicon Carbide/ Silicon Carbide for the lower seal and Carbon/Ceramic for the upper seal. Metallic components of the mechanical seal shall be constructed of 300 series stainless steel. The seal system shall not rely upon the pumped media for lubrication and shall not be damaged when the pump is run dry. A readily accessible inspection screw shall be provided for inspecting the condition of the seal chamber oil during routine maintenance.
Bearings: The pump shaft shall rotate on permanently lubricated, greased bearings. The upper bearing shall be a single row deep grooved ball bearing. The lower bearing shall be a heavy duty, single row, deep grooved ball bearing. Upper and lower bearings shall be of sufficient size and properly spaced to transfer all radial and axial loads to the pump housing and minimize shaft deflection. B-10 bearing life shall be a minimum of 30,000 hours at BEP. Pump designs utilizing components other than ball bearings, or those requiring supplemental guide bushings for the shaft or impeller, shall not be considered acceptable.
Motor: The motor housing shall be 304 stainless steel and the top cover of Nylon 66. The motor shall be of the squirrel-cage induction design with copper windings, housed in an air filled, water tight chamber. The motor shall be capable of continuous submerged operation under water to a depth of 30 feet. The stator windings and stator leads shall be insulated with moisture resistant Class E insulation rated for 120oC (248o F). The motor shall be capable of operating continuously, submerged in liquid of 40oC (104o F) without overheating. The motor shall be capable of handling up to 10 evenly spaced starts per hour. All motors shall have a voltage tolerance of +/- 10% from nominal name plate rating.
POWER CABLE
The power cable shall be sized according to NEC and CSA standards. The outer jacket of the cable shall be oil and water resistant thermoplastic elastomer. The power cable shall be fitted to the motor using an epoxy potted water tight cable entry system with a rubber grommet as the secondary seal and strain relief.
CONTROL
The Solid State Oil Minder® control system shall be approved to UL508 standards and housed in a gasketed NEMA 4X enclosure made up of polycarbonate and also ABS to increase the strength of the box. The dimensions of the box shall be 7.5”x7”x4”. The enclosure shall have an opaque hinged cover, with a transparent window made up of polycarbonate and a silicone gasket for sealing. The control panel shall include a field adjustable switch with variable sensitivity settings for oil with a separate over-current relay and field adjustable motor overload heater with an optional automatic or manual reset button. The control panel shall have an adjustable high decibel warning horn with illuminated red light and alarm silencing switch. The Oil Minder Main control shall be factory wired (pump, oil probe and floats) within the NEMA 4X enclosure. Separate LED indicator lights allow users to monitor: 1) oil alert, 2) high water, 3) high motor amps, 4) power to system and 5) pump activation.
Systems that require field wiring for anything other than system supply power are to be considered unacceptable.
OPERATION SEQUENCE
The main float shall rise (close) when the liquid level increases in the sump pit. The main pump relay shall close to allow the pump to discharge the liquid as long as the oil sensor has a resistance to ground lower than the set point (i.e., the oil sensor is in conductive water and normal operation is allowed). The pump relay shall open when the liquid level drops below the oil sensor probe tip (pump off). There is a one-second time delay after the liquid level drops below the oil sensor probe tip. At this point, the oil sensor probe voltage drops from 5VDC to 15 millivolts DC until the “pump-on” float rises again, at which point the oil sensor input voltage returns to 5VDC. The 15-millivolt input greatly reduces the potential field and subsequent metal ion exchange, thus preventing buildup of foreign matter on the probe surface. If either float is closed, and the oil sensor measures a higher resistance than its set point, the pump shall be disabled and the oil LED, audible alarm, and remote alarm relay shall be energized. This failure condition is non-latching and is automatically cleared by returning the oil sensor to a conductive fluid, or by lowering the floats.
Oil Detection Probe
The factory-installed oil sensor probe detection system shall be hermetically sealed and sleeved with Delron to prevent liquid from compromising the probe assembly. The main body of the probe to be made from heavy duty 316 Stainless Steel with low voltage, self-cleaning technology. The oil sensor probe voltage shall not exceed 15 millivolts DC until it comes in contact with water, at which point the oil sensor returns to 5VDC. The low 15 millivolt DC input shall reduce the potential field and subsequent metal ion exchange, helping to prevent a build-up of foreign matter on the probe surface.
Sensing systems using optical lenses subject to dirt contamination and false alarms are not considered equal. The pump control float and oil sensing probe are to be factory mounted on the pump and factory tested. When factory installed, the correct depth from bottom of probe to pump base is not to exceed 4.5”, thus utilizing the maximum pumping range of the sump. Field mounted pump floats and oil sensors are not considered equal due to installation by untrained personnel.
High-Level Alarm/Redundant Run Float
The high-level liquid alarm shall be enabled by an additional float placed at a level in the pit above normal acceptable liquid levels. The rising of this float (closing) shall cause the controller to energize the audible alarm (where applicable), remote alarm relay (dry contacts), and the high-level LED. The high-level alarm shall only be de-energized after the high-level float drops to its normal state (open). The high-level liquid alarm shall not disable the pump motor from normal operation. In addition, the activation of the high-level float will also attempt to run the pump should the normal start float have become incapacitated. This provides 100% redundancy for the primary run float.
Silence Button
An external control mounted silence alarm button shall be provided to de-energize the audible alarm for the convenience of maintenance personnel. Depressing this button shall not clear any fault, but shall silence the alarm for 5 minutes. If a fault is removed and returns, the audible alarm shall reenergize as expected.
Self Diagnostic
The control shall include a “push to test” feature for all pump and control diagnostic functions. This test helps ensure the system is installed properly and remains in working order.
Floats
The float shall be a normally open, wide angle type. The material of construction shall be A.B.S. The standard length of float supplied shall be 16’. The cable shall be 16-2 AWG with SJOW insulation. Floats shall be factory mounted to ensure correct operation.
Oil Sensing Probe
The oil sensing probe major construction shall be 316 stainless steel, and black Delrin. The probe shall be hermetically sealed to prevent liquid compromising the probe. The wire shall be 18-2 AWG with SJOOW insulation. Standard length Shall be 16’. Probe shall be factory mounted to the pump to ensure the correct level for shutting the system down due to lack of water or oil present. Field mounted probes or sensing devices are not considered equal due to installation by untrained personnel.
Installation Requirements
The SE-50 Oil Minder® shall be supplied as a factory assembled system. The system shall physically fit and be fully functional with all on-off and oil detection features along with all alarms within a 24” X 24” X 24” deep sump, allowing adequate operational space for a required grate or pit cover.
Third-Party Certification
The control unit, pump, floats and sensor probe shall be factory assembled as a complete, ready-to-use system and shall be tested, approved and labeled, for the intended purpose as a system, by a nationally recognized testing laboratory such as Intertek™.
Specifications subject to change without notice Page 3 of 3
Stancor, LP. 515 Fan Hill Road, Monroe, CT 06468 Tel: 203-268-7513 Fax : 203-268-7958 www.stancorpumps.com