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Figure 611 Basic chart for ow rate and velocity of steam in schedule 40 pipe (SOURCE: Copyright 2001, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Reprinted by permission from ASHRAE Handbook, 2001 Fundamentals, Chap 35, Fig 10)
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the out-and-back system will have the lowest rst cost but the highest pumping cost The loop system will have an intermediate rst cost and the lowest pumping cost The reverse-return system will have the highest rst cost and an intermediate to low pumping cost The loop system is preferable but only if the geometry is suitable
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Design Procedures: Part 4 Design Procedures: Part 4 171
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Figure 612 Velocity multiplier
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chart for Fig 611 (SOURCE: Copyright 2001, American Society of Heating Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Reprinted by permission from ASHRAE Handbook, 2001, Fundamentals, Chap 35, Fig 11)
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System expansion and pressurization
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The volume of the water in a piping system varies as its temperature changes If not compensated for in some way, this can result in unacceptably high pressures or, at the other extreme, such low pressures that pump cavitation takes place due to ashing (boiling) The simplest way to accomplish this is to allow some water to leave the system through a pressure relief valve as the pressure rises, and to replace it through a makeup valve as the pressure falls This is not a satisfactory solution, because the continuous addition of fresh water, with its entrained air, increases corrosion and requires venting of the air The purpose of the pressurization system is to maintain the pressure within allowable limits while limiting the addition of fresh water The usual method of doing this involves an expansion tank (sometimes called a compression tank) (Fig 619) This provides a place to store the excess volume of water created by expansion and includes a cushion of air or inert gas which will compress or expand to maintain pressure within limits The gas cushion will be gradually absorbed by the water so that, unless it is replenished, the system will eventually become waterlogged Maintenance of the cushion can be manual or automatic This problem can be alleviated by use of a diaphragm-type
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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1 16 18 14 12
TABLE 69
Return Main and Riser Capacities for Low-Pressure Steam Systems, lb / h
1 32
1 24
14 12
Design Procedures: Part 4
14 12
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
SOURCE: Copyright 2001, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Abstracted by permission from ASHRAE Handbook, 2001 Fundamentals, Chap 35, Table 16
Design Procedures: Part 4 Design Procedures: Part 4 173
Figure 613 Out-and-back piping system
tank which has a watertight exible diaphragm to separate the air and water Open expansion tanks are sometimes used (Fig 620) Because this tank is open to air, the maximum water temperature is limited The tank must be above the high point of the piping system, and the corrosion problem created by the air interface must be recognized The possibility of freezing also exists if the tank is in an unheated space The point at which the expansion tank connects to the piping system is the point of no pressure change when the pump is started or stopped It is preferable that this point be on the suction side of the pump to minimize the total pressure If the connection were on the discharge side of the pump, the total pressure would have to be greater in order to prevent cavitation at the pump inlet An exception to this is an attic location for the tank, which would result in a smaller tank than one at the bottom of the system This arises out of the pressure relationships in the sizing equation, as described below The size of a closed expansion tank is determined by (1) the volume of water in the system, (2) the range of water temperatures expected in normal operation, (3) the air pressure in the expansion tank when
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