Document JN1K1meDGDQM80ZdoJo2k3vKO

American Society 0/ Heating and Ventilating Engineers Guide, 1929 Vent to Atmosphere Run to Air above Roof" 1blind Nipple- ` Overflow Pump Control Valve hOramY^' unobstructed Sham toBoilerFeedPumf JobaiterFeedPump, Discharge from Pump to Tank Steam to ^.Vacuum Pump Globe Valve G/obe^1 Valve Lubricator', Globe lhive' BaiterFeedPump r ui . CastIron BasePtate f lj 1 and Drip Pan ------ 1 **""**'' Lubricator 'Globe Valve Globe Valve By-pass Globe Valve and Union / GateVatvey Suctionstrainer Lift Fitting ToSewer Vacuum Pump CastIronBase Plate and Drip Pun FloorL/ne Fig. 7. Method of Connecting Vacuum Pump, Boiler-Feed Pump and . Steam-Control Receiving Tank Fig. 8. Method op Making Connection to Steam-Operated Vacuum Pump 300 Chapter XVIII--Pumps and Traps for Heating and Ventilating Equipment air pressure plus the column of mixed air and water in the pump discharge to the tank constitute the total head against which the pump must act. Fig- 5 shows a hydro-pneumatic separating tank as well as a freely vented separating tank, for alternate use as conditions require. Where the pressure in the heater, boiler, etc., varies materially from time to time and where it is desired to save energy by diminishing the head against which the pump shall work, a hydro-pneumatic type tank may be used, instead of a plain tank set at a higher elevation, to over come the peak pressure in the boiler or heater. Table 15 gives the size of plain and hydro-pneumatic tanks for air separating purposes and also those for storage of returns. In the latter case the tanks are based upon storing the quantities of water which will be discharged during five minutes at the basis of hourly rates given in the first column. ._ When the head on the delivery side of steam driven vacuum return pumps exceeds 15 lb. per square inch the condensate should be delivered to a vented receiver located close to the level of the vacuum pump outlet. This receiver1 should be connected to a. separate steam or power driven water pump capable of delivering against the maximum head and should be controlled by a throttle valve or motor control, actuated by some suit able means, from the water line in the receiving tank. Typical vacuum pump connections for several different conditions of service, are shown by Figs. 6, 7 and 8. LIFTS In vacuum heating systems where condensation is to be raised to a higher level it should be accomplished by means of lift fittings. , . Lifts of 6 ft. or over should be made in steps rather, than in one rise or through drag lift (consisting of long upwardly-inclined pipes.) In any case the pipes between the lifts should grade downward toward the pump. Table 15. Sizes of Plain and Hydro-Pneumatic . Separating Tanks Condensation Pounds fee Hour 4,000 6,000 8,000 10,000 16,000 24,000 34,000 45,000 60,000 Fob Air Separation Onlt - ' Diameter Inches Length Inches 12 12 18 18 24 . 30 24 24 36 30 48 48. 48 72 36 60 36 72 42 : 36 60 96 42 72 42 96 For . Air Separation and Water Storage Diameter Inches Length Inches 24 24 24 30 30 . . 36 36 36 48 72 48 60 60 72 36 96 42 72 42 -- 48 48 96 --- 72 96 301