Hydrotrol Water Hammer Arresters
All Sizing and Placement Data is in Accordance with Plumbing and Drainage Institute Standard P.D.I. WH-201
It has been established that the preferred location for the water hammer arrester is at the end of the branch line between the last two fixtures served.
Two basic rules were established - one for branches up to 20 ft. in length, and another for branches over 20 ft. in length.
Rule 1, covers multiple fixture branch lines which do not exceed 20 ft. in length. Hydrotrol Sizing Table 2 is used to select the required unit.
Rule 2, covers multiple fixture branch lines which do exceed 20 ft. in length. Hydrotrol Sizing Table 2 is used to select the required units. The sum of the Fixture Unit Ratings of units X and Y shall be equal to or greater than the demand of the branch.
EXAMPLE OF SIZING AND PLACEMENT
