Preferred Utilities Manufacturing Corp.

1. Preferred Utilities Manufacturing Corp. Top 20! Things to Watch Out For… Preferred Utilities Mfg. Corp. 31-35 South St. • Danbury • CT www.preferred-mfg.com

2. No. 20 Tank Heating and Insulation

3. 20 - 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 • Option for Thermopump System is a winter blend of fuel oil • Piping - # 6 oil – heat trace the pipe and insulate or FOS, FOR, steam and condensate return lines in a single carrier pipe with insulation

4. 20 - Tank Heating and Insulation

5. No. 19 Tank Gauge Installation

6. 19 - Tank Gauge Installation • TG-EL-WF, Wire Float Assembly requires 14” of clearance for installation • TG-EL-WF offers mechanical testing of the assembly without removal from the tank • Vaulted tanks have minimal overhead space

7. 19 - Tank Gauge Installation

8. No. 18 Fuel Leak Detection

9. 18 - Fuel Leak Detection • Underground Storage Tank (UST) – Pipe leak detection requirements, pitch double wall pipe containment to the piping sump on the tank • Underground Storage Tank (UST) – Typical pipe pitch is 1/8”/ft, long linear runs could present problems, might require a second sump • All tanks –Discriminating leak detector for the Dry Interstitial space of the tank

10. 18 - Fuel Leak Detection

11. No. 17 Tank Overfill Prevention

12. 17 - Tank Overfill Prevention • Tank gauging with overfill alarm station • Type 2 In-Wall Spill Container with Overfill Alarm Station • Mechanical fill line overfill prevention device (i.e. OPW type 61) • Vent line with overfill alarm switch

13. 17 - Tank Overfill Prevention

14. Multiple Day Tank Applications No. 16 Flow Control

15. 16 – Flow Control Multiple Day Tank Applications • Install control flow components: Three valve by-pass arrangement for manual operation and servicing, (2) Solenoid valves, N.C. (normal fill) & N.O. Solenoid valves (overfill prevention) • Options: Fuel filter, flow switch

16. 16 – Flow Control

17. Multiple Day Tank Applications No. 15 Overflow Port Size

18. 15 - Overflow Port Size Day Tank continuous overflow system • Verify single day tank overflow port size capable to overflow pump supply capacity • Overflow port location & high level switch on the level controller • Redundant back up – Install vent line leak switch & utilize N.O. Solenoid valves for vent line overflow conditions

19. No. 14 Day Tank Location

20. 14 - Day Tank Location • Day tank above main storage tank – gravity return, overflow port sized to meet pump flow rate • Day tank below main storage tank – non-gravity return, return pump system is required, pump flow rate capacity larger than pump set supply system

21. No. 13 Air Entrainment

22. 13 - Air Entrainment • BPRV: Riser piping, install BPRV at the bottom of the riser, set pressure to maintain a constant head to prevent the cascading of the fuel and entraining air • Syphon Breaker: Day tank header system applications, can use in conjunction with the BPRV

23. 13 - 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

24. 13 - 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, 6-8” off the bottom of the tank • FOR, 18-20” off the bottom of the tank, add a 90 elbow to direct return fuel away from suction

25. No. 12 Burner & Day Tank Loops

26. 12 – Burner & Day Tank Loops Burner – Flooded Loop • Review piping losses & layout, BPRV may be required to divert oil into day tank • Day tank supply at end of loop to assure burners will have sufficient fuel supply Burner – Pressure Loop • Connect day tank FOS downstream of the BPRV • Review piping losses & layout, BPRV may be required to divert oil into day tank

27. No. 11 Fire Safety

28. 11 - Fire safety • Lever Gate Valve: Install with a fusible link in the FOS piping to the pump set • Fusomatic valve: Install in FOS lines to the fuel consuming equipment (i.e. burners and generators)

29. No. 10 Relief Valves

30. 10 - Relief Valves • Relief valves on pump set– piped into the return line with no shut off valves • Multiple tank system with ball/gate valve arrangement, pipe relief valve into pump suction, utilize pump flow switch for safety shutdown

31. No. 9 Fuel Oil ReturnShut-off Valves

32. 9 - FOR Shut-off valves • No shut-off valves in the FOR piping • If multiple tank design recommend utilizing a Tank Selector Valve, preventing a positive shutoff in the return line • If tank selector valve not desirable, recommend automatic ball valves with end switches: preventing a positive shutoff with proper alignment and preventing a tank overfill due to improper valve alignment

33. No. 8 Vent Line Vertical Height

34. 8 - Vent Line Vertical Height • Main Storage Tanks and Day Tanks • Maximum - 12’of vertical vent line • Important - 5 psi rating on standard tanks • 2.31 ft = 1 psi • 12”/2.31=5.19 psi

35. No. 7 Foot Valve Installation

36. 7 - Foot Valve Installation • Install foot valve 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 • Extractor fitting can be a potential air leak

37. No. 6 Maximum Height forASV

38. 6 - 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

39. Maximum Elevation No. 5

40. 5 - Maximum Elevation • Bottom of tank to pump centerline: 15 feet • Rule of Thumb: # 2 oil, 15’=11.5” hg static lift • Allows for line & fitting losses • Allows for pump wear and dirty strainer • Allows for the unforeseeable design issues

41. No. 4 Long Linear Runs

42. 4 - Long Linear Runs • Minimize linear pipe runs, Ideally design system for a maximum 15” hg at pump inlet (empty tank), utilize your “Preferred Utilities Pipe Sizing Program” tool!!! • Continuously exceed 17” of vacuum will cause premature pump wear & failure • Long pipe runs present priming challenges • Avoid inverted loop FOS pipe runs

43. No. 2 Fuel Oil Filtration

44. 3 – Fuel Oil Filtration • NFPA 110 Standard for Emergency and Standby Power Systems 2002 Edition • 7.9.1.3, Tanks shall be sized so that the fuel is (1) consumed within the storage life, or (2) provision shall be made to re-place stale fuel or (3) clean fuel.

45. 3 – Fuel Oil Filtration • Future NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, 1999 Edition • 8-6.4, Fuel Supply Maintenance. The fuel storage tanks shall be kept as full as possible at all times, but never less than 50 percent of tank capacity. The tanks shall always be filled by means that will ensure removal of all water and foreign material.

46. 3 – Fuel Oil Filtration • Solution: Preferred Filtration Sets

47. No. 2 Flow Rate Sizing

48. 2 - Flow Rate Sizing Fuel Oil Loop, Burners – Flooded Loop Series – burners with integrated pumps • Burner return line piped into the FOS of the next burner • Pump flow rate based on burn rate of the burners in the beginning of the loop plus the pump rate of the last burner, pump set flow 1.5 times the total consumption. • Small burners require an Operating Safety Valve (OSV), NFPA code requirement (i.e. Power Flame, Webster, Gordon Piatt).

49. 2 - Flow Rate Sizing

50. 2 - Flow Rate Sizing Fuel Oil Loop, Burners – Pressure Loop Parallel – burners without integrated pumps • Burner return line piped into the FOR piping down stream of the back pressure regulating valve • Pump flow rate based on burn rate and fuel oil bypass, rule of thumb is 1.5 to 2 times the total burn rate of all burners • Back Pressure Regulating Valve (BPRV)