Presentation on theme: "Preferred Utilities Manufacturing Corp."— Presentation transcript:
1Preferred Utilities Manufacturing Corp. Fuel Oil Handling SystemsFuel System Design ConsiderationsPart 231-35 South Street • Danbury • CT
2Additional Design Considerations Oil Heating and InsulationPreventing OverflowsDay Tank Flow ControlAir EntrainmentFire SafetyRelief ValvesMulti-Tank ReturnsVent Line HeightFoot ValvesAnti-Syphon Devices
3Tank Heating and Insulation Aboveground Storage Tank (AST) – installed in a cold climate – # 2 thru # 6 oil, heating requirements and insulation of tankEmergency generators – Approximately 40 F is the cloud point of paraffin wax in # 2 fuel oil Thermopump System application# 6 Oil Piping - heat trace the pipe and insulate or install FOS, FOR, steam and condensate return lines in a single carrier pipe with insulationUse a Thermopump System or a winter blend of fuel oilThe fuel user is going to have viscosity and temperature requirements.
8Tank Overfill Prevention Tank gauging with overfill alarm stationHLS in tank to back up the tank gaugeModel 1 Ground Level Spill ContainmentType 2 In-Wall Spill ContainerRemote Overfill Alarm StationMechanical fill line overfill prevention device ( Type 61 and 61F)Vent line with overfill alarm switch
9Sidewalk or Driveway Fuel Fill Spill ContainersModel 1 In Ground Spill ContainerDrains oil spilled from delivery disconnect into storage tankDesigned to handle driveway trafficRemovable bellows for easy fuel testing without pavement excavation.
10Inside Fill ContainerDischarge piping can be smaller than the suction piping, the pump will make up for the added pressure
11Model 2 In-wall Fill Cabinet Provides 5 Gallon ContainmentFor indoor storage tankswith fill lines pipedto building wallsOverfill alarmAlarm silenceDisplay tank levelModel 2
18Filling Day Tanks in Multiple Tank Applications Flow ControlFilling Day Tanks in Multiple Tank ApplicationsInstall Flow Control ManifoldsOne for each day tankThree valve by-pass arrangement for manual operation and servicing, (2) Solenoid valvesOptions: Fuel filter, flow switch, oil meter, indicator lights
21Day Tank Location Day tank above main storage tank gravity returnProvide tank overfill drain to main tankDay tank below main storage tankreturn pump system is requiredpump flow rate capacity must be larger than the pump set supply systemAdd a PLS switch to the tank vent
22Air EntrainmentPipe the return line to the bottom of the tank to prevent aerationBack Pressure Regulator BPRVReturn riser pipe, install BPRV at the bottom of the riser, set pressure to maintain a constant head to prevent the free fall of the fuel and entraining airSyphon BreakerDay tank header system applications, can use in conjunction with the BPRV
23Air EntrainmentSeparate the Fuel Oil Supply (FOS) and Fuel Oil Return (FOR) Piping drop tubes in the tank to prevent the recycling of airFOS, 4-6 inches off the bottom of the tankFOR, inches off the bottom of the tank, add a 90 elbow to direct return fuel away from suction
25Stop the flow of the fuel Fire Safety BasicsDon’t Feed the FireStop the flow of the fuel
26Fire Safety Shut-off Valves Lever Gate ValveFully mechanicalEmergency fuel line shut-off is mandated by many codesFusible links open at 165Ffor pipe ranges 3/4" - 3"Fusomatic ValveReplaceable fusible elementFusible links open at 165F, May be manually opened/closedfor pipes 3/4" or 1"
31Relief Valves A must with positive displacement pumps If the oil line is blocked, something will breakRelief valves on pump set– piped into the return line with no shut off valvesMultiple tank systems with ball/gate valve arrangement, pipe relief valve into pump suction, utilize pump flow switch for safety shutdownPlace a relief valve between two solid points to relieve hydraulic pressure from thermal expansionInternal relief valves are to be avoided.
33Multiple Main Tank Returns On multiple main tank applications, recommend utilizing a Tank Selector Valve that will never have a positive shutoff when changing tanksIf tank selector valve not desirable, recommend automatic ball valves with end switches. Pumps shut down during a tank changeover and will not restart until proper alignment is proven. This will also prevents a tank overfill due to improper valve alignment.
34Two Tank Selector Valve Threaded ConnectionReplaces confusing arrayof hand valvesSimple lever operationtransfers both supply & returnlines from one tank to the otherDesigned with no “blind spots” where flow could be blocked to or from the tanksThreaded or flanged connections available
35Vent Line Vertical Height Main Storage Tanks and some Day Tanks are only rated for 5 PSI. Tanks are not pressure vessels.On overfilled tanks that do not provide for an overflow condition, the oil will go up the vent.The static pressure at the bottom of the tank can exceed the pressure rating of the tank.Remember that 2.6 ft of #2 oil = 1 PSI13 feet/2.6 = 5.0 PSIPLS switch in the vent can sound an alarm or shut off a pump.
36Foot Valve Installation Install foot valves and check valves to prevent loss of prime if top of the tank is below the centerline of the pumpUtilize an extractor fitting for easy removal of foot valve for maintenance and inspectionExtractor fitting can be a potential air leak. Insure they are properly sealed.Foot valves are sometimes required withAnti-Syphon valves. An Anti-Syphon valve does not make a good check valve.Insure the shipping plug is removed before installation.
38Maximum Height for ASVInstall Anti-Syphon Valve (ASV) if top of the tank is above the centerline of the pumpMaximum height for ASV – 20’ above centerline of pumpAbove 20’ utilize a solenoid valve for an anti-syphon device