66

DUPLEX PUMP UNITS SPM SERIESFEATURESThe SPM duplex models consist of two pump/motor assem-blies with a pre-piped, common discharge manifold. Onepump/motor unit operates continuously, with the second pro-viding backup service if the main pump fails. Either automat-ic (SPM-DA models) or manual (SPM-DM models) controlsare available.

The duplex automatic series are designed specifically forbuildings where a constant supply of oil must be assured ...hospitals, apartment buildings, schools and other commer-cial/industrial buildings

The DA Series is equipped with a pressure sensing devicewhich detects a loss in pressure of the primary pump. If thestandby pump is brought into service, an alarm sounds whichindicates a malfunction in the primary pump.

The electric control circuit on the duplex automatic pump setis equipped with a lead-lag switch to permit manual alterna-tion of pump to provide even wear on each pump.

The manually operated duplex pump sets offer the same pro-tection as an automatic except the standby pump must beturned on manually which requires that maintenance person-nel always be available.

67

SUPPLY UNIT SPECIFICATIONS

SPM Series Supply Units

Single and Duplex

Capacities:15, 30, 65, and 135 gph

Pressure:Maximum operating pressure to 80 psi or 200’ of head.

Motors: All motors are 60 cycle, 1750 rpm, continuous duty, 48Nframe, 1/6, 1/4, 1/3 hp: split phase, 115 or 230 volt operation,1/2 hp: capacitor start/induction run, TEFC, dual 115/230volt.

Pumps:SPM 15, 35, and 65: uses Webster “2R” Series pump units.SPM 135: uses the Webster ‘2V” Series pump unit.Webster 2R and 2V are UL listed

Porting:SPM 15, 30, 65:

1/4” NPTF—2 inlets, outlet port and top and bottom returns

SPM 135:1/4” NPTF—outlet port3/8” NPTF—return port, 2 optional inlets.1/2” NPTF—inlet.

Seal: All models—double lip type.

Mounting:All models — four bolt foot mount

Filter:Rotary self cleaning type, except in SPM 135. Use ofexternal line filter recommended.

Valves:Pressure regulating assembly in pump maintains set pressure.Check valve maintains oil in feeder lines for instant starts.

Gauge:2-1/2” dia., calibrated from 30” vacuum to 100 psi.

Controls: Two Types for Duplex Units Only Duplex automatic with lead-lag switch and alarm. Manual with selector switch.

Maximum Inlet Vacuum:All units—15” Hg

National Fire Protection Association compliance requires fuelinlet pressure not to exceed 3 psig.

68

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70

INSTALLATION DATA

Compound Gage0-30” Hg0-100 psi

Check Valve

Discharge Port1/4” Pipe Thread

This PortNever Used

Pressure AdjustingScrew 1/8” Allen

Head Socket UnderSeal Screw

SPM-135 Models

Preferred Cover inlet1/2” Pipe Thread

Return Port3/8” Pipe Thread

Optional Return Port1/4” Pipe Thread

Inlet Port #21/4” Pipe Thread

Return Port1/4” Pipe Thread

Inlet Port #11/4” Pipe ThreadAccess to 1/8”Bypass Plug

71

Pump Selector Switch

Test Button

Common DischargeManifold With

IntegralCheck Valves

Inlet Port1/4” Pipe Thread

Compound Gage0-30” Hg0-100 psi

Discharge Port1/2” Pipe Thread

InletPorts1/4”Pipe

Thread

Inlet Ports1/4” Pipe Thread

Return Port1/4” Pipe Thread

Inlet Port1/4” Pipe Thread

Return Port1/4” Pipe Thread

1/2” D.Mounting

Holes

Pressure AdjustingScrew 1/8” Allen

Head SocketUnder Seal Screw

Pressure Adjusting Screw1/8” Allen Head Socket

Under Seal Screw

72

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75

INSTALLATION DATA

SPM Single and Duplex Manual Models

SPM Single and Duplex Manual units are capable of supply-ing fuel oil to heating units or tanks located up to 200 feetabove the supply pumps. They are designed for use in main-tained pressure or open loop systems. Pump pressures canbe set at a range from 20 psi to 85 psi See Correct SupplyLine Size charts, for maximum discharge head.

Tank to Pump Connections

Connect suction line from the tank to preferred supply pumpinlet port. Connect return line from pump return port to tank.Internal 1/8" bypass plug (factory installed) must be in posi-tion for recommended two-pipe operation. Be certain allplugs and connections are secure and leak tight.

The correct suction line size can be determined by referringto the charts. Generally, the return line should be sized thesame as the suction line. Check valves in the suction linesbetween the tank and SPM units assure that pumps are fullof oil, ready for service. Check valves must be oil tight. Lowpressure drop swing type are recommended to minimize fric-tion loss.

For SPM Duplex Manual models, preferred installation callsfor a separate suction line from tank to pump for eachpump/motor unit. If system failure occurs because of a grossleak in the suction line of the primary unit, the second unitcan still provide backup service. Check valves can beinstalled in return lines to allow removal of inactive pump forservicing, while primary pump continues to run.

These typical installation diagrams, illustrating a maintainedpressure supply system or optional open loop system, forcontinuous pump operation, are shown for reference only.Compliance to all applicable codes where installed is the soleresponsibility of the installer.

76

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77

SPM Duplex Automatic Models

SPM Duplex Automatic units consist of two SPM Seriespump/motor assemblies and an electrical control panel. Theyare designed for use in maintained pressure supply systemsonly. if system pressure falls below a preset level, the controlautomatically switches from the primary pump/motor unit tothe secondary unit. If the backup pump/motor unit also failsto reach or maintain preset system pressure, the control alsoshuts off the backup unit.

A pump selector switch allows the two pump/motor units tobe manually alternated for even wear on each pump. Pumppressures can be set at a range from 20 psi to 85 psi. SeeCorrect Supply Line charts, for maximum discharge head.

Tank to Pump Connections

Units should be set for two-pipe operation. Preferred instal-lation calls for a separate suction line from tank to pump foreach pump/motor unit. If system failure occurs because of agross leak in the suction line of the primary unit, the secondunit can still provide backup service.

The correct suction line size can be determined by referringto the charts Generally, the return line should be sized thesame as the suction line. Low pressure drop, swing typecheck valves can be installed in the suction lines, assuringthat pumps are full of oil, ready for service. Check valves inreturn lines allow removal of inactive pump for servicing. Useof shutoff valves in return lines is not recommended. Be cer-tain all plugs and connections are secure and leak-tight.

+ Not supplied by Webster

+ +

78

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