Section 250-RICR-150-10-6.31 - PumpsA. Required Use - Pumps are required for OWTSs that meet any of the following conditions: 1. The OWTS is designed for intermittent discharge;2. The OWTS is designed for pressure dosing;3. Pump is required for an approved Alternative or Experimental Technology;4. The maximum length of a dispersal trench in the leachfield is between seventy-six feet (76') and one hundred feet (100'); or5. The total length of the distribution lines in the leachfield exceeds five hundred feet (500').B. Dual Alternating Pumps1. When a pump is required, dual alternating pumps are required for the following (otherwise a single pump is sufficient):a. The total length of the distribution lines in the system exceeds one thousand feet (1,000');b. The OWTS serves a use other than single family residential, the design flow is less than two thousand (2,000) gallons per day, and there is no storage capacity for one (1) day's design flow; andc. The OWTS serves a use other than single family residential and the design flow is greater than two thousand (2,000) gallons per day.2. Dual alternating pumps shall operate in the following sequence: pumps off; primary (lead) pump on; backup (lag) pump on and alarm on; pumps must alternate.3. When dual alternating pumps are discharging to separate leachfields, the pump discharge lines shall be inter-connected and provisions made to permit dosage of both leachfields with one (1) pump when the other is being serviced.C. Size - The pump must be sized to accommodate the proposed use. All system head curves and associated calculations shall be submitted with the design. Centrifugal pumps must be capable of passing three quarter inch (3/4")diameter solids.D. Piping - The Licensed Designer shall specify pump discharge pipe sizing and provide backup calculations to support specification. The pump discharge pipe shall be PVC Class 200 minimum.E. Controls and Power Supply - Pump controls shall be moisture proof if located above the liquid level. Watertight controls shall be used when the contents are submerged. All controls and junction boxes on the power supply shall meet appropriate electrical codes. Standby power shall be provided at all uses other than single family residential, unless otherwise approved by the Director.F. Alarms - All pumps shall be equipped with a high water level, visible and audible alarm powered by a circuit separate from the pump power.G. Installation - Pumps shall be installed in strict conformance with the manufacturer's specifications. Provisions should be made to easily remove the pumps for servicing.250 R.I. Code R. 250-RICR-150-10-6.31
Amended effective 11/25/2018
Amended effective 12/28/2021
Amended effective 7/1/2022