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8200 N. Austin Ave
 Morton Grove
IL 60053
USA
 Tel 847 966-3700
Fax 847 965-8379
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 Dictionary of Terms
Water Hammer
Water hammer is one of the chief causes of noise in steam heating systems a nd also the major cause of damage to thermostats and floats in traps. It is a wave transmitted through a pipe filled, or partially filled, with water. It may originate as waves set up by steam passing at a high velocity over condensate collected in piping.
Fig. 3-19 illustrates how such a wave may be formed. The rapid passage of steam over the surface of the water causes a wave to form as at "B". The rapid condensation of the steam in pockets "A" brings the two slugs of water together with a considerable force, which may be telegraphed through the piping. Read more in the article "Good Piping Practice Prevents Water Hammer in Steam Systems".
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