Document 5YaZZVYpnbdogJgBvQQLOyER

American Society of Heating and Ventilating Engineers Guide, 1924-25 TABLE 70. DIRECT DOUBLE ACTING STEAM DRIVEN.RECIPROCATING VACUUM PUMPS Diameter in Inches Water CvtlNDER Condensation* Lb. per Hr. for Pumps with Stroke Equal to Bore Direct Cast Iron Radiation Served 3 510 1700 4 1047 3490 5 1830 6100 6 2890 9633 7 4250 14,166 5920 19,733 9 7980 26,600 10 16,350 34,500 12 16,300 54,333 14 24,000 80,000 16 33,500 111,666 18 45,000 150,000 20 58,500 195,000 22 74,300 247,666 24 92,300 317,666 26 112,800 376,000 28 135,800 452,666 3D 161,300 537,666 32 189,600 632,000 34 221,000 736,333 36 254,000 846,666 Pipe Sizes Steam In. Suction In. Discharge In. a lA A la A2 A 2A % 2J4-3A A 3-3a A l 43-A41-44 l 4J4-5 IA 5-6 iA 6-7 lA 7 iA 7-8 2g 2 8-10 2A 10 2A 12 2A 12 3 14 3 14 3 14 Pomps Having Unequal Stroke and Bore Stroke Bore Capacity Factor 2.50 2.25 2.00 1.90 1.80 1.75 1.70 1.67 1.60 1.50 1.40 1.33 1.30 1.25 1.20 1.10 1.00 0.90 0.80 0.75 0.70 0.67 0.60 0.50 1.58 1.48 1.38 1.34 1.31 1.29 1.27 1.25 1.23 1.10 1.15 1.13 1.12 1.10 1.08 1.04 1.00 0.96 0.91 0.89 0.87 0.85 0.82 0.78 Size op Pump In. iA iA IA m 2 2 2 2 2` 2.A m 2A 2H m 3. 3 3 3 3 4 4 4 4 4 Size op ifDischarge Capacity Gal. per Min. iA IA IA m 2iA 2 2 2 2 2A 2A 2A 2A 2A 3 3 3 3 3 4 4 4 4 4 60 60 60 60 60 125 125 125 125 125 200 200 200 200 200 275 275 275 275 275 500 500 500 500 500 Total Head Ft. Speed. Limits Revolutions per Min. Minimum 850 980 1120 1250 1400 750 900 1000 1120 1200 650 800 900 1000 1100 .550 600 700 750 800 1000 1050 1120 1250 1350 Maximum 1450 1800 1800 1800 1800 1200 1450 1650 1800 1800 1120 1300 1500 1750 1800 1120 1300 1500 1750 1800 1120 1250 1450 1600 1750 Site op Motor H. P. American Society of Heating and Ventilating Engineers Guide, 1924-25 From which we have ^4a = *4w X ^ 4* Pd ^ X 3 in which Jv " Aa => Area of, steam piston in square inches. Aw = Area of water piston in.square inches. Pb = Boiler pressure in pounds per square inch. Pi => Discharge pressure in pounds per square inch. V = Vacuum at pump expressed in inches of mercury. V = Approximate vacuum in pounds per square inch 2 in. mercury = approxi- ~2 mately 1 lb. per sq .in. SUMP PUMPS Sump pumps are usually of the vertical shaft centrifugal type and the following Table 71 will give the size capacity, horse-power and other essential data covering several commercial sizes of this type pump. The Hydraulic Society has published a list of trade standards used in the pump industry which it recommends and this publication may be obtained by engineers from the Hydraulic Society. TABLE 72. RECIPROCATING VACUUM PUMPS Maximum Speed for Steam Driven Pumps Length op Stroke In. Number op Single Strokes per Min. Piston Speed Ft. per Mm. S. Length op Stroke In. Number op Single Strokes per Min. Piston Speed Ft. per Min. S. 3 100 25 12 60 4 90 30 14 57 5 84 35 15 56 6 80 40 16 55 7' 69 40 18 53 A8 67 . 45 20 '51 10 60 50 22 49 60 66^ 70 73 80 85 90 Maximum Speed for Power Driven Punips Length Rev. per op Stroke Min. Crank In. Shaft Single Strokes per Min. Piston Speed. Ft. per Min. S. Length op Stroke In. Rev. per Mm. Crank Shaft SlNGLS Strokes per Mm. Piston Speed, Ft. per Min. S. 3 80 160 40 10 40 80 67 5 50 100 42 12 40 80 80 6 50 - 100 50 16 30 60 80 8 50 100 67 20 25 50 83 Use Mfg. Speed when equal or less than above.