Is a skimmer equalizer considered a drain for purposes of determining a cover’s capacity to handle the pump system flow?
No. Skimmers are designed to clog and the equalizer, if present, only operates when the skimmer is not functioning, so CPSC staff does not consider them as part of a “multiple drain system.” Since there are so many different ways to consider/set the system from a percentage of flow point of view (% main drain + % skimmer), CPSC staff considers ‘system flow’ to be flow through the drain outlet(s) only, a worst case scenario. Any additional systems (such as skimmers) add some safety factor as they take some of the flow and reduce the flow required at the main drain. If the skimmers become inoperable, the system is still protected by having appropriately rated covers in place. If the scenario should be reversed (main drain(s) inoperable), it is not of significance since the skimmers should be designed to handle 100% flow and they do not present the same hazard as submerged suction outlets.
Related Questions
- What is an administrative action and what is a legislative action for purposes of determining if an action is subject to initiative and referendum?
- If I routed the drain from the refugium directly into the chamber with the pump how would I take care of the micro bubbles?
- Do skimmer equalizer grates need to comply?
