All Sizing and Placement Data is in Accordance with Plumbing and Drainage Institute Standard P.D.I. WH-201

It is recommended that for extra long branches (in excess of 40' in length), the water supply should tie into the branch at some mid-point location. The example shows a branch of approximately 60' in length which can be fed at some mid-point location; thus applying Rules #1 and #2 at either side of the feed line for sizing and placement.

By using Rules #1 and #2 almost every battery situation can be sized and the HYDROTROLS properly located. Fig. 1 shows the method of sizing and placement in a typical multi-story building which has a great variety of fixtures and fixture locations.

Table 3 indicates the size HYDROTROL required for long runs of piping which feed a single remote fixture or appliance. HYDROTROL unit should be sized by using Table 3 and located as close to the point of quick closure as possible.

Note: Table 3 shows lengths of run of branch piping. The length of run used should be the length of the pipe from the point of valve closure to a point of relief, such as a large pipe twice the size of the branch line, main line or water tank.

All sizing recommendations shown in Table 3 are based on an operating water pressure of 65 PSI or under and an average velocity between 5 and 10 feet per second. If operating pressures are over 65 PSI use the next larger HYDROTROL unit. When pressures are anticipated above 85 PSI a pressure reducing valve is recommended.