Document 0Jgm3GXRvaYk4XBJ93dggGQvR

'^Kvrr'- American Society 0/ Heating and Ventilating Engineers Guide, 1925-26 No additional 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 and the trade standard, required in accordance with the manufacturers adoptions copy of which is appended to this section of the code for reference. Table 77. Motor Driven Condensation Pump Capacities for Delivering Against Various Pressures RADIA TION IN Sq. Ft. OF Direct Radia Minimum Gallons per Min. Maximum Boiler Pressure Lb. Motor H. P. tion Sug gested Size of . Piping Inches 4000 4000 4000 6-8 6-8 6-8 10 15-40 50-60 k1 k1 H1 6000 6000 6000 9-12 9-12 9-12 10 15-40 50-60 K % 1 mm IK 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 30-40 50-60 k Vi 1 ik K % 1 ik 2 ik IK IK IK IK IK IK IK IK Radia tion in Sq. Ft. of Direct Radia Minimum Gallons per Min. Maximum Boiler Motor Pressure H. P. Lb. tion 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 30-40 50-60 10 15 20 30-40 50-60 10 15 20 30-60 K 1 IK 2 .3 K 1 2 3 5 1 IK 2 3 5 1 IK 2 5 Sug gested Size of Piping Inches 2 2 2 2 2 2 2 2 2 2. 2K 2K 2K 2K 2K 2K 2K 2K 2K 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 134 American Society of Heating and Ventilating Engineers Guide, 1925-26. Table 78. One Pump One Motor Return Line System Size 0 jr 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 1^4 2 3 5 10 10 20 Table 79. Two Pump One Motor Return Line System Vacuum Pumps Capacity Sq. Ft. of Direct Radiation 6000 6000 . 8000 8000 12,000 12,000 "I8;ooo 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. H 1 1 IK 1 1/4 1/4 2 2 3 Table 80. Two Pump Two Motor Return Line System Vacuum Pump Capacity Sq. Ft. of Capacity G. P. M. Pressure at Pump Direct Radiation 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 K K K K %A K K .M 1 1 l 1 ' M K M l % 1 1 2 1J4 2 2 ' 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. 135