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Figure 35 Summary plot of the effect of close-coupled 4 in ells (Copyright 2002 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc wwwashraeorg Reprinted by permission from ASHRAE Transactions, Vol 108, Part 1)
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Figure 36 Loss coefficients for ells (Copyright 1999 American Society of Heating,
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Refrigerating and Air-Conditioning Engineers, Inc wwwashraeorg Reprinted by permission from ASHRAE Transactions, Vol 105, Part 1)
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Piping System Friction Piping System Friction 67
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Figure 37 Loss coefficients for reducing ells (Copyright 1999 American Society
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of Heating, Refrigerating and Air-Conditioning Engineers, Inc wwwashraeorg Reprinted by permission from ASHRAE Transactions, Vol 105, Part 1)
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Tests were conducted on 6, 8, and 10 in fittings, and they can be compared to tests on steel fittings that were completed under Research Project 1116 RP It has been believed for some time that the friction loss in plastic pipe fittings was less than for steel pipe fittings of the same nominal size These tests demonstrated that this is not the case The reason is the smaller radii of the elbows as shown in Fig 38a, and the sharp edges of the reducers, as shown in Fig 38b Comparable K factors for steel and plastic pipe fittings are available from these tests Figure 39 shows the piping arrangement for these tests 35 Thermoplastic Pipe Thermoplastic pipe is being used in the HVAC industry for cold water services such as cooling tower and chilled water systems It can offer distinct advantages cost-wise on some installations It has a decided advantage on cooling tower water that may be laden with oxygen and where steel pipe is susceptible to rusting The pressure and temperature ratings of plastic pipe and fittings are available from the principal
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Piping System Friction 68 The Basic Tools
PVC VENDOR A
PVC VENDOR B
SHORT RADIUS FORGED STEEL
LONG RADIUS FORGED STEEL
a Comparison of PVC elbows with steel
b Shapes of plastic pipe reducers
Cross-sections of steel and plastic fitting (Copyright 1999 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc wwwashraeorg Reprinted by permission from ASHRAE Transactions, Vol 105, Part 1)
manufacturers of this pipe Most thermoplastic pipe as used on HVAC water systems is manufactured in PVC (polyvinyl chloride), schedule 40 and 80 pipe, and CPVC (chlorinated polyvinyl chloride), schedule 80 pipe Thermoplastic pipe is manufactured in sizes up to 16 in, but many common pipe fittings may not be readily available over 12-in
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Piping System Friction Piping System Friction 69
Figure 39 Comparison of 4-in PVC and steel elbow fitting loss coefficients (Copyright 1999 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc wwwashraeorg Reprinted by permission from ASHRAE Transactions, Vol 105, Part 1)
pipe size This is its principal drawback for larger cooling tower installations Thermoplastic pipe offers a lower resistance to water flow than steel pipe It is the plastic pipe industry s standard to use the WilliamsHazen formula for calculating pipe friction with a C factor of 150 This is acceptable, since most applications of plastic pipe are for water near 60 F On warmer water, the manufacturer of the plastic pipe under consideration should provide friction loss data comparable with those secured from the use of Reynolds numbers and the Darcy Weisbach equation There are a number of types of plastic pipe now available to the HVAC industry, from PVC, schedule 40, to Fiberglas ASHRAE s 1992 issue of the System and Equipment Handbook provides information on the various types of plastic pipe Table 10, Properties of Plastic Pipe, page 4213, provides a summary of this important type of piping In assessing plastic material for a particular application, the following factors should be evaluated: 1 Temperature The temperature and pressure ratings of some types of plastic pipe and fittings decrease appreciably above 100 F 2 Expansion Most plastic pipe has a coefficient of expansion greater than steel pipe; expansion must be taken into consideration on HVAC systems where variations occur in both ambient air temperature and the liquid being transported
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