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Preferred Utilities Manufacturing Corp.

Preferred Utilities Manufacturing Corp. Fuel Oil Handling Systems Fuel System Design Considerations Part 2. 31-35 South Street • Danbury • CT www.preferred-mfg.com. Additional Design Considerations. Oil Heating and Insulation Preventing Overflows Day Tank Flow Control Air Entrainment

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Preferred Utilities Manufacturing Corp.

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  1. Preferred Utilities Manufacturing Corp. Fuel Oil Handling Systems Fuel System Design Considerations Part 2 31-35 South Street • Danbury • CT www.preferred-mfg.com

  2. Additional Design Considerations • Oil Heating and Insulation • Preventing Overflows • Day Tank Flow Control • Air Entrainment • Fire Safety • Relief Valves • Multi-Tank Returns • Vent Line Height • Foot Valves • Anti-Syphon Devices

  3. Tank Heating and Insulation • Aboveground Storage Tank (AST) – installed in a cold climate – # 2 thru # 6 oil, heating requirements and insulation of tank • Emergency 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 insulation • Use a Thermopump System or a winter blend of fuel oil

  4. Tank Heating and Insulation

  5. Tank Overfill Prevention • Tank gauging with overfill alarm station • HLS in tank to back up the tank gauge • Model 1 Ground Level Spill Containment • Type 2 In-Wall Spill Container • Remote Overfill Alarm Station • Mechanical fill line overfill prevention device ( Type 61 and 61F) • Vent line with overfill alarm switch

  6. Sidewalk or Driveway Fuel Fill • Spill Containers • Model 1 In Ground Spill Container • Drains oil spilled from delivery disconnect into storage tank • Designed to handle driveway traffic • Removable bellows for easy fuel testing without pavement excavation.

  7. Inside Fill Container

  8. Model 2 In-wall Fill Cabinet Model 2 • Provides 5 Gallon Containment • For indoor storage tanks with fill lines piped to building walls • Overfill alarm • Alarm silence • Display tank level

  9. In-Wall Fill Box with Sign

  10. Inside Type 2 In-Wall Spill Box

  11. In-Wall Spill Box Digital Display

  12. Fil-A-Larm Overfill Alarm Box

  13. HLS High Level Sensor

  14. Day Tank Vent Detector

  15. Flow Control Filling Day Tanks in Multiple Tank Applications • Install Flow Control Manifolds • One for each day tank • Three valve by-pass arrangement for manual operation and servicing, (2) Solenoid valves • Options: Fuel filter, flow switch, oil meter, indicator lights

  16. Flow Control Manifold

  17. Flow Control Manifold

  18. Day Tank Location • Day tank above main storage tank • gravity return • Provide tank overfill drain to main tank • Day tank below main storage tank • return pump system is required • pump flow rate capacity must be larger than the pump set supply system • Add a PLS switch to the tank vent

  19. Air Entrainment • Pipe the return line to the bottom of the tank to prevent aeration • Back Pressure Regulator BPRV • Return 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 air • Syphon Breaker • Day tank header system applications, can use in conjunction with the BPRV

  20. Air Entrainment • Separate the Fuel Oil Supply (FOS) and Fuel Oil Return (FOR) Piping drop tubes in the tank to prevent the recycling of air • FOS, 4-6 inches off the bottom of the tank • FOR, 18-20 inches off the bottom of the tank, add a 90 elbow to direct return fuel away from suction

  21. Air Entrainment VENT VACUUM BREAKER (OPTIONAL) TRAP HEADER RETURN RETURN RETURN SUPPLY SUPPLY SUPPLY ENGINE #3 ENGINE #2 ENGINE #1 RELIEF IN OUT PUMP SET

  22. Fire Safety Basics Don’t Feed the Fire Stop the flow of the fuel

  23. Fire Safety Shut-off Valves • Lever Gate Valve • Fully mechanical • Emergency fuel line shut-off is mandated by many codes • Fusible links open at 165F • for pipe ranges 3/4" - 3" • Fusomatic Valve • Replaceable fusible element • Fusible links open at 165F, May be manually opened/closed • for pipes 3/4" or 1"

  24. Fire Safety Shut-off Valves • Multiple Fusible Links • Fuel Shut-off and • Limit Switch Stops Pump

  25. Type 110 Fire Valve

  26. Anti-Syphon Valves

  27. Stop Fuel Flow

  28. Relief Valves • A must with positive displacement pumps • If the oil line is blocked, something will break • Relief valves on pump set– piped into the return line with no shut off valves • Multiple tank systems with ball/gate valve arrangement, pipe relief valve into pump suction, utilize pump flow switch for safety shutdown • Place a relief valve between two solid points to relieve hydraulic pressure from thermal expansion

  29. Pump Set Relief Valves

  30. Multiple Main Tank Returns • On multiple main tank applications, recommend utilizing a Tank Selector Valve that will never have a positive shutoff when changing tanks • If 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.

  31. Two Tank Selector Valve • Replaces confusing array of hand valves • Simple lever operation transfers both supply & return lines from one tank to the other • Designed with no “blind spots” where flow could be blocked to or from the tanks • Threaded or flanged connections available Threaded Connection

  32. Vent 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 staticpressure at the bottom of the tank can exceed the pressure rating of the tank. • Remember that 2.6 ft of #2 oil = 1 PSI • 13 feet/2.6 = 5.0 PSI • PLS switch in the vent can sound an alarm or shut off a pump.

  33. Foot Valve Installation • Install foot valves and check valves to prevent loss of prime if top of the tank is below the centerline of the pump • Utilize an extractor fitting for easy removal of foot valve for maintenance and inspection • Extractor fitting can be a potential air leak. Insure they are properly sealed. • Foot valves are sometimes required with Anti-Syphon valves. An Anti-Syphon valve does not make a good check valve. • Insure the shipping plug is removed before installation.

  34. Foot Valves

  35. Maximum Height for ASV • Install Anti-Syphon Valve (ASV) if top of the tank is above the centerline of the pump • Maximum height for ASV – 20’ above centerline of pump • Above 20’ utilize a solenoid valve for an anti-syphon device

  36. Single Source Fuel Handling

  37. Preferred Utilities Manufacturing Corp 31-35 South Street • Danbury • CT T: (203) 743-6741 • F: (203) 798-7313 www.preferred-mfg.com

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