Boiler Guide

106
Oll Pressure vs. Nozzle Flow Rate ConversIon
1. Divide new pressure by 100 psi
(Standard nozzle pressure)
EXAMPLE: 140 ÷ 100 = 1.4
2. Obtain square root. (Use calculator)
EXAMPLE: 1.4 √ = 1.18 32159
3. Multiply result by nozzle size at 100 psi.
EXAMPLE: 1.1832159 x 1.00 =1.18 gph
This is your new gph flow rate @ 140 psi
How To Figure DomestIc Water
1 gal. #2 oil per hr.=140,000 BTUH
140,000 x 80% =112,000 gross BTUH
1 gal. water= 8.3 lb.
To raise 1 lb. Water 1˚F=1 BTU
To raise 8.3 lb. Water 100˚F
in 1 minute=8.3 x 100˚F = 830 BTU/min.
To raise 8.3 lb. Water 80˚F
in 1 minute=8.3 x 80˚F= 664
112,000 BTU Gross hr. =1866.66 BTU
60 min. Gross per min.
1866.66=2.2489 gal. per min. 100˚F rise.
830
1866.66=2.2489 gal. per min. 80˚F rise.
664
40˚F inlet Water + 100˚F rise =14 0˚ F.
40˚F inlet Water + 80˚F rise =120˚F
Helpful Conversion Factors
for Heating Systems
Boiler Tube Sizing (Pg. 7–205 Hoffman data book)
Sq.ft. heating surface x 1.15 = Hp x .3 = Gph
10
Water Capacity Per Foot of Pipe
Pipe Size 1/2” 3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 3-1/2” 4” 5” 6”
Gallons
Per Foot
.016 .023 .040 .063 .102 .17 .275 .39 .53 .69 1.1 1.5
Most Common
pipe sizes
3” pipe
3-1/2” pipe
4” pipe
Sq. Ft. of surface
(ext) per 1 foot pipe
0.916
1.047
1.178