Page 66 - HVAC Pump Handbook

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Piping System Friction
Piping System Friction 63

Figure 3.4 Fabrication of steel pipe fittings.

vigilance should be provided to maintain the quality of field-fabricated
fittings and to eliminate the use of screwed bushings and reducing
flanges.

3.4.2 Results of recent laboratory testing
of fittings
ASHRAE has recognized the antiquity of the data on the friction loss
of water flowing in pipe fittings. They have embarked upon an expen-
sive program of testing steel and plastic pipe fittings to verify and
update the information on these friction losses. They have done this
at their own expense even though it will be of great value to many
professional societies and to the entire piping industry. ASHRAE is
offering for sale this information in the form of papers presented on the
results of these tests. They can be secured from ASHRAE in Atlanta,
Georgia by referencing the following research project numbers. There

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