Water Hammer Arrestor Sizing Guide

The science explaining the physics of water hammer.

Water hammer arrestor sizing guide.

Water hammer arrestors shall conform to asse 1010. There have been various methods devised for the sizing of water hammer arresters. We also review the history of water hammer in plumbing systems previous attempts to control water hammer and why these methods failed. Water hammer arrestors shall be installed in accordance with the manufacturer s specifications.

4 standard pdi wh 201 water hammer arresters water hammer the term water hammer is well known to engineers contractors maintenance personnel and other persons engaged in the plumbing and piping industry. Water hammer arrestors zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax. Explanation fixture unit sizing and selection table is used to select the required pdi unit water hammer arrestor. Ever since water was first conveyed by a piping system the destructive forces and hammer blow sounds associated with water.

To help clear up the confusion the following article was excerpted from the pertinent sections of the plumbing drainage. These methods have created confusion regarding the proper sizing and location of water hammer arresters among engineers contractors and other persons engaged in the plumbing industry. Water hammer arrestors zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax. Figure 2 these fixture unit values are the common values that most engineers utilize to size their water distribution systems.

Water hammer arrestor installation guide watts lf150a lf150 ha pdf retrieved 2017 04 02 original source. This section covers the physics of uncontrolled water. Sizing and placement rule 1 covers multiple fixture branch lines which do not exceed 20 ft. Rule 2 covers multiple fixture branch lines which do exceed 20 ft.

Pex barb tee 1 2 pex barb fitting and uponor propex barb tee 1 2 pex barb fitting. Arresters absorb the shock wave created by a sudden stoppage of the water flow. Hammer and its damaging effects as they pertain to any piping system. Lf lead free ed.

Installing a water arrester on each line supplying the offending fixture or fixtures usually solves the problem.