Preferred Utilities Manufacturing Corp.

Preferred Utilities Mfg. Corp.31-35 South St. • Danbury • CT

www.preferred-mfg.com

Top 20!

Things to Watch Out For…

Tank Heating and Insulation

No. 20

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

20 - Tank Heating and Insulation

Tank Gauge Installation

No. 19

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

19 - Tank Gauge Installation

Fuel Leak Detection

No. 18

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

18 - Fuel Leak Detection

Tank Overfill Prevention

No. 17

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

17 - Tank Overfill Prevention

Flow Control

No. 16Multiple Day Tank Applications

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 – Flow Control

Overflow Port Size

No. 15Multiple Day Tank Applications

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

Day Tank Location

No. 14

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

Air Entrainment

No. 13

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

13 - Air EntrainmentVACUUM BREAKER

(OPTIONAL)

VENT

TRAP

RETURNRETURNRETURN

HEADER

SUPPLY SUPPLY SUPPLY

ENGINE #3ENGINE #2ENGINE #1

RELIEF

IN OUT

PUMP SET

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

Burner & Day Tank Loops

No. 12

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

Fire Safety

No. 11

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)

Relief Valves

No. 10

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

Fuel Oil ReturnShut-off Valves

No. 9

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

Vent Line Vertical Height

No. 8

8 - Vent Line Vertical Height

Main Storage Tanks and Day Tanks

Maximum - 12’12’ of vertical vent line

Important - 5 psi 5 psi rating on standard tanks 2.31 ft = 1 psi 12”/2.31=5.19 psi

Foot Valve Installation

No. 7

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

Maximum Height forASV

No. 6

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

Maximum Elevation

No. 5

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

Long Linear Runs

No. 4

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

Fuel Oil Filtration

No. 2

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.

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.

3 – Fuel Oil Filtration

Solution: Preferred Filtration SetsPreferred Filtration Sets

Flow Rate Sizing

No. 2

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).

2 - Flow Rate Sizing

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)

2 - Flow Rate Sizing

2 - Flow Rate Sizing

Day Tank Fuel Oil Supply Loop Emergency Generators FOR returning to day tank,

size pump set to meet total burn rate Emergency Generators FOR returning to main

tank, size pump set to meet injector pump capacities

Determining factor for FOR to day tank vs. main tank: fuel oil cooling radiator to prevent day tank overheating

Determine duty cycle of pump set

System Design&

Integration

No. 1

1 – System Design & Integration

Work with your Preferred Utilities Regional Managers Educate your customers and consulting engineers of

the benefits of having a Preferred Utilities system at their facility

Integrate the system to offer sole source responsibility. This is to assure the customer the highest standards of product quality and system integrity for reliability

Write the specification for the engineer!!!

Preferred Utilities Manufacturing Corp

For further information, contact...

Preferred Utilities Manufacturing Corporation31-35 South St. • Danbury • CT

T: (203) 743-6741 • F: (203) 798-7313www.preferred-mfg.com