How deep does a field fabricated sump need to be?
Going to section “2.3.4 Submerged Suction Outlets” of the ASME A112.19.8 – 2007 Standard, quote “Submerged suction outlets are manufactured cover/grate assemblies that may or may not connect directly to the circulation piping must have either the manufacturer’s recommended sump…, or a field built sump of the design specified by the manufacturer… Alternatively, a sump built in accordance with Figure 2 shall be permitted.” “Figure 2” shows the needed distance between the top of the pipe to the bottom of the grate to be 1 ½ times the diameter of the pipe. This is a “default setting”. This is to be used when a manufacturer has not called out the specs for a sump underneath their respective cover. Keep in mind that “Installation Instructions” are required for compliancy with the ASME Test’s Standard and should call out the required depth per the manufacturer. AquaStar requires a minimum of 3 inches of sump depth underneath all of our covers including 12×12’s and the 32 inch channel drains –
