11.125.140 Surge analysis.
(a) Hydraulic transient problems shall be analyzed in detail and surge control measures shall be incorporated in the design, as dictated by the results of the analysis.
(b) One of the elements for control of transients is an automated pump control valve (plug valve) hydraulically operated. The criteria for incorporating such a valve on the pump discharge shall be as follows:
(1) In-Line Booster Stations. Hydraulically operated, automatic pump control. Valve shall be installed:
(i) If the results of the surge analysis dictate the need for such a valve; or
(ii) If the total dynamic head (TDH) of the pumps exceeds 175 feet.
(2) Booster Stations with Pumped Storage. Hydraulically operated automatic pump control valve shall be installed:
(i) If the results of the surge analysis dictate the need for such a valve; or
(ii) If the total dynamic head (TDH) of the pumps exceeds 150 feet.
(c) If the surge analysis does not dictate the need for an automatic pump control valve and the total dynamic head of the pump is below 150 feet, a spool piece to accommodate the possible future installation of a hydraulically operated plug valve shall be incorporated into the design. (28-ME-DG-02 § 7)