Issue 18 and Volume 78.

QUESTIONS AND ANSWERS “He that questioned much shall learn much”— BACON NOTE—Readers of FIRE AND WATER ENGINEERING are invited to send in questions, which will be answered in the order received. Names are omitted from questions unless otherwise specified. Air Valves in Water Mains To the Editor: Is it necessary to place air valves in the pipe lines and where is the best place to install them? Yours truly, T. E. B. Answer: Air valves are required to release the air pocketed in the water mains during the filling process. These are located at the pronounced summits, and generally a hydrant is made to serve the purpose. Where wood stave and steel pipe are used that is larger in diameter than 24 inches, in some instances, a valve has been used which will automatically let in air to .prevent the collapse of the pipe should a vacuum tend to form…

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