Document OEdG3EoX8joBp09ajRBpEaBQe

American Society of Heating and Ventilating Engineers Guide, 1936 to accommodate miscellaneous other services or provide underground passage between buildings. SERVICE CONNECTIONS Most district heating companies enforce certain regulations regarding the consumer's installation, partly to safeguard their own interests but principally to insure satisfactory and economical service to the consumer. Chapter 37--District Heating operation of the line in case of failure in the reducing valve. In the smaller sizes, the reducing valve can be removed, a filler installed, and the house valve used to throttle the flow of steam. Fig. 4 shows a typical installation used for high pressure steam service. The first reducing valve, usually furnished by the utility company, Fig. 2. Connections for Reducing Valves of Size Less than 4 Inches There are certain fundamental principles that should be followed in the design of a building heating system which is to be supplied from street mains. Although some of these apply to any building, they have been demonstrated to be especially important when steam is purchased. Fig. 4. Steam Supply Connection when Using Condensation Meter effects the initial pressure reduction. The second reducing valve, usually furnished by the customer, reduces the steam pressure to that required. 1. Provision should be made for conveniently shutting off the steam supply at night and at other times when heat is not needed. It has been thoroughly demonstrated that a considerable amount of heat can be saved by shutting off steam at night. Although there is, in Return main Fig. 3. Connections for Reducing Valves of. Size 4 Inches and Larger, and for Expanded Valves Figs. 2 and 3 show typical service connections used for low pressure steam service. As shown in Fig. 2, no by-pass is used around the reducing valve on sizes less than 4 in. Fig. 3 illustrates the use of a by-pass<around reducing .valves 4 in. and larger. This latter construction permits the 676 some cases, an increased consumption of heat when steam is again turned on in the morning, there is a large net saving which may be explained by the fact that the lower inside temperature maintained during the night obviously results in lower heat loss from the building, and less heat need therefore be supplied. Steam can be entirely shlft-off at night in most buildings even in very 677