American Society of Heating and Ventilating Engineers Guide, 1928
No additi'onal^allowance need be made for covered mains or risers, but exposed mains or risers used as heating surfaces should be included in calculating the equivalent square feet of direct, radiation.
PUMP SPECIFICATIONS
Reciprocating and power driven pumps should be specified as to make, size, water and steam working pressures, piston speed, temperature of water to be handled, electric motor characteristics, etc.
Table 15. Motor Driven Condensation Pump Capacities for Delivering Against Various Pressures
Radia
tion in Sq. Ft. of
Direct Radia
tion
Minimum Gallons per Min.
Maximum
Boiler Motor
Pressure H. P.
Lb.
4000 4000 4000
6-8 6-8 6-8
10
15-40 50-60
34 34 34
6000 6000 6000
9-12 9-12 9-12
10
15-40 50-60
y* 34
1
8000 8000 8000 8000
10,000 10,000 10,000 10,000 10,000
12-16 12-16 12-16 12-16
15-20 15-20 15-20 15-20 15-20
10
15
20
30-60
10
15 20-30 3040 50-60
34 34
1
m
34 34
l
m
2
Sug gested Size of Piping Inches
i
i i
m IX
134
m m
134
m
134
134
134 134 134
Radia tion IN Sq. Ft. of Direct Radia
tion
Minimum Gallons per Min.
Maximum
Boiler Motor
Pressure H. P.
Lb.
15,000 15,000 15,000 15,000 15,000
20,000
20,000
20,000
20,000
20,000
25,000 25,000 25,000 25,000 25,000 30,000 30,000 30,000 30,000
25-30 25-30 25-30 25-30 25-30 30-40 30-40 30-40 30-40 30-40 40-50 40-50 40-50 40-50 40-50 50-60 50-60 50-60 50-60
10
15 20-30 40 50-60
10
15
20
3040 50-60
10
15
20
3040 50-60
10
15
20
30-60
34
1
134
2
3
3A
1
2
3 5
1
134
2
3 5
1
134
2
5
Sug gested Size of Piping Inches
2 2 2 2 2 2 2 2 2 2
234 234 2J4 234 234 - 234 2J4 234 234
The kind of drive should be specified for power driven pumps.
Centrifugal and rotary pumps should be specified as to make, type,
capacity, temperature of water to be handled, speed and motor charac
teristics including:
%
(1) Name of motor manufacturer; (2) Manufacturers rated Horse Power; (3) The maximum temperature rise for any part of the motor above the temperature of the surrounding air; (4) Full Speed in R. P. M; (5) Current characteristics; (6) Whether the motor is open, semi-enclosed or fully enclosed.
The following should also be included in the specifications, total head to be pumped against including suction lift, friction head, velocity head and head against which the pump must discharge. The vacuum under which return pumps are required to operate and as to whether two or more units are to operate in parallel or separately.
All pumps should be set on substantial foundations and be provided with heavy cast iron sub-bases, securely anchored to foundation and pro vided with drip ring with drain properly connected to sump or sewer.
190
Chapter IX--Pumps for Heating and Ventilating Equipment
Table 16. One Pump One Motor Return Line System
Size
A B C D E F
G
H
Sq. Ft. Direct Equivalent radiation Surface
Diameter Orifice Vacuum
10 In.
8000 16,000 26,000 40,000 65,000 100,000 150,000 250,000
9-64 3-16 1-4 9-32 3-8 1-2 9-16 Three 1-2
Air Capacity
Cu. Ft. per Min.
6 11 19 25 42 75 90 180
Water Capacity
Gals, per Min.
10 Lb. Pres sure 180 F.
ii 22 35 60 90 140 200 400
Actual
H. P.
0.9 1.4 2.0 2.8 3.9 9.0 10.0 10.0
R. P. M. H. P. of Motor
1800 ' 1800 1800 1200 1200 1200 900
720
i
134
2 3 5 10 10 20
Table 17. Two Pump One Motor Return Line System Vacuum Pumps
Capacity Sq. Ft. of
Direct Radiation
6000 6000 8000 8000 12,000 12,000 18,000 18,000 30,000 30,000
Capacity G. P. M.
9 9 12 12 18 18 27 27 45 45
Pressure at Pump
10 15 10 15 10 15 10 15 10 15
Motor H. P.
34
l l
134
l
134 134
2. 2 3
Table 18. Two Pump Two Motor Return Line System Vacuum Pump
Capacity Sq. Ft. OF
Direct Radiation
Capacity G. P. M.
Pressure at Pump
6000 6000 8000 8000 12,000 12,000 18,000 18,000 25,000 25,000 30,000 30,000
9 9 12 12 18 18 27 27 38 ' 38 45 45
10 15 10 15 10 15 10 : 15 . 10 15 10 15
Motor H. P.
Air
Water
34 34 34 34 34 34 34 34
1
l
l
1
34 34 34
l
34
l
l
2
134
2
134
2
The exhaust from steam driven pumps supplying steam for heating purposes should be taken through an efficient oil separator before entering any part of the heating system or other apparatus.
Motors should be not less than Yi greater in horsepower than that actually required to drive the pump under full load conditions.
191
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