Pressure maintenance pumps (PMP), or jockey pumps (JP) as they are more commonly referred to, are an often incorrectly sized part of a fire pump system. Lets walk through the fundamentals. Why/When Required: To start with, technically you are not required to provide a jockey pump on all systems. NFPA 20 section A.4.25 states " Pressure maintenance (jockey or make-up) pumps should be used where it is desirable to maintain a uniform or relatively high pressure on the fire protection system. " The goal is to not shock the system with water hammer when the main fire pump starts. You don't want to be boosting the pressure from 10 psi to 150 psi. You want to be boosting the pressure in the 5-15 psi range. It is our recommendation that in almost all situations, a jockey pump should be provided to minimize pressure surges when the main fire pump starts. Jockey Pump Types: Jockey pumps are not required to be listed per NFPA 20-2010 section 4.25.1. The failure of a jockey pump
Starting immediately, AC Fire is offering a new diesel fuel tank design with more than double the current number of tank sizes available. In addition they will now come standard with emergency vents and a Tnemec N69 Crawford Red paint for better durability. Link to PDF literature for new double-wall fuel tank on the AC Fire web-site. Also check out our blog post on Sizing Diesel Fuel Tanks or the Installation of Diesel Fuel Tanks for Fire Pumps if you want to learn more about the code requirements associated with diesel tanks. Please reach out if you need additional information.