Mechanical Contracting & Plumbing January-December 1909 . impossible. Sometimes the trouble is simply aslow surging of the water in certainpipes, while in other cases it variesfrom a slight snapping to sounds whichare similar to those produced by a blowfrom a heavy hammer and accompaniedby severe vibration of the pipe. Thesinging is caused by a slightly higher a short time, until the pipes become hotand an equilibrium is established ; butthis should not continue in any wellconstructed system of piping after ithas had an opportunity to becomewarmed up. Persistent water hammeris a sign of poor d
Mechanical Contracting & Plumbing January-December 1909 . impossible. Sometimes the trouble is simply aslow surging of the water in certainpipes, while in other cases it variesfrom a slight snapping to sounds whichare similar to those produced by a blowfrom a heavy hammer and accompaniedby severe vibration of the pipe. Thesinging is caused by a slightly higher a short time, until the pipes become hotand an equilibrium is established ; butthis should not continue in any wellconstructed system of piping after ithas had an opportunity to becomewarmed up. Persistent water hammeris a sign of poor design or faulty con-struction and no piece of work shouldbe accepted by the owner until this hasbeen remedied. Water hammer often occurs in extend-ed systems of piping operating under alow boiler pressure, as this is likely tofluctuate and thus unbalance the pres-sure in the system. Although suchplants are much simplified by operatingwith a gravity return, they usually runmore quietly when a moderate boilerpressure is carried and the steam is EQUALIZING. CQUAtlllMO MpC »»€5F=* H*OUTOI> VALVE ifff??././//.., ??:/(.? /////j/
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