Intermediate Pressure System : A water mist system where the distribution system piping is exposed to pressures greater than 12. 1 bar (175 psi) but less than 34. 5 bar (500 psi)
NFPA 750 Standard on Water Mist Fire Protection Systems, 2003 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/75 0/750_FKT-AAA_SDAgenda_01-13.pdf, (Std: Wtr Mist Fr Prac Sys - Amer) {346 NFC}