Preferred Utilities Manufacturing Corp.
Preferred Utilities Manufacturing Corporation31-35 South St. • Danbury • CT
www.preferred-mfg.com
Fuel Oil Sizing Program Overview
Introduction
PC Based Program Sizes Typical Fuel Oil Piping Systems Helps to determine “workability” of overall
application Helps to sizing suction and discharge piping
Day Tank Schematic
Determining Pump Capacity
For day tank systems rate of use vs. duty cycle determines pump flow length of time without power determines tank size E-Gen sets – “RULE of THUMB” 7 GPH / 100kw E-Gen sets - “RULE of THUMB” 4:1 , pump runs 25% of time.
For burner systems parallel loop, total burning rate plus total return flow series loop, total burning rate plus return flow of last burner
only
Pick pump-motor pair with next greater flow rate Motor HP based on PSI required
Maximum Inlet Suction
Atmospheric pressure (30" Hg) provides the force to get oil into the pump
Most pumps can produce a 20" Hg vacuum Good practice limits suction to a 15" vacuum or less Typical piping loss is 5" Hg This leaves 10" Hg for static lift, or 12' of oil Pump should not be located more than 12' above the
bottom of the tank
Determining Inlet Suction
Suction at pump inlet Add gravity head plus: Friction losses
Friction loss through suction piping convert fittings, valves, etc. to equivalent
diameters add total length of pipe to equivalent for fittings add loss through strainer
Increase pipe size or lower pump to suit
Pressure Drop through Pipe
Flow, Gallons per hour
Pressure drop through pipe,Number 2 Fuel Oil
Equivalent Diameters
» ball valve, full ported 3» check valve, lift type 600» check valve, swing type 100» foot valve, poppet type 420» globe valve 340» gate valve, full ported 8» plug valve 18» 90 degree elbow 30» 45 degree elbow 16» Tee, through run 20» Tee, through branch 60
Suction Piping Precautions
If both pumps in a duplex set may be run together, use total flow in calculations
Figure static lift from bottom of tank Use a 100% safety factor for strainer drop Use a 40 or 100 mesh strainer for #2 oil Use worst case viscosity in figuring loss
Priming the System
Try to keep pump close to tank Eliminate “up and over” lifts Add a priming funnel to the high point Do not allow pumps to run dry If possible, always use a foot valve to hold
prime Pressure test all suction piping
Some Terminology Operating Pump Suction: This value is displayed on the
screen at the suction side of the pump. This value is the total summation of all losses encountered on the suction side of the pump.
Priming Pump Suction: This value takes into account the vertical lift of a dry system, and may also be referred to as the priming static lift. If a pump looses its prime, and the piping system is dry, the static lift may not be the same as the priming static lift. Therefore, the Priming Pump Suction must be examined as well as the Operating Pump Suction. This value takes into account the vertical distance of piping that might go above the centerline of the pump, before connecting with the pump.
S.G: Density of a fluid compared to the density of water.
Discharge Piping
Pressure at pump discharge Add pressure needed at point of use plus total gravity head and pipe losses
Generally, discharge piping is smaller than suction piping
A Back Pressure Regulating Valve may be used to regulate pressure at point of use (boilers)
Viscosity as a Function of Temp.
Miscellaneous Cautions
Beware of entrained air locate return and supply at opposite ends of tank
Avoid high lifts and “traps” Allow for easy priming of pumps Provide adequate vent lines Provide properly sized day tank overflow lines Design the system so it can be tested regularly Don’t overlook controls
Loading the Fuel Oil Sizing Program
Opening Window - Select New or Existing File
Discharge Piping Selection
Application Selection Page
Opening Overview Display
Suction Piping Selection
Discharge Piping Selection
Final Overview Display
Pop Up Windows
Report Printing
Example
P1 P2
10feet
10feet
300 gph
Required5 psi
100 feetof 1 inch
Suction pipe
200 feetof 1 inch
Discharge pipe
Exercise 1For No. 2 Fuel OilDetermine:P1 and P2Select Pump Set 100
feet
Storage Tank
Rule of THUMB
Head Vacuum5 ft of No. 2 Oil = 4 " Hg
Head Pressure5 ft of No. 2 Oil = 2 psi
Example
P1 P2
5feet
15feet
400 gph
Required5 psi
100 feetof 1 inch
Suction pipe
300 feetof 2 inch
Discharge pipe
Exercise 2For No. 2 Fuel OilDetermine:P1 running and priming, P2ASV Spring SizeSelect Pump Set
200feet
ASV
Storage Tank
17.5feet
Rule of THUMB
Head Vacuum5 ft of No. 2 Oil = 4 " Hg
Head Pressure5 ft of No. 2 Oil = 2 psi
Pressure Drop through Pipe
Flow, Gallons per hour
Pressure drop through pipe,Number 2 Fuel Oil
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