The 855 Series is Carver’s offering specifically designed to meet the needs of Filtrate Pump users. Since originally developed in the late 1950s at the request of a large Original Equipment Manufacturer (OEM) of vacuum filtration equipment, a wide variety of options are now being included as standards into each pump produced.
Flange mounting directly to the receiver tank eliminates suction piping/NPSH problems and allows pumping to resume even after short periods of interrupted flow. Capable of operating in vacuum conditions up to 26” Hg, the specially designed semi-open impeller assures pumping from a trickle to full capacity. Rugged in design and dependable in nature, the 855 Series is a workhorse in some of the toughest environments in the industry. Capacities range to 700 GPM, depending on discharge head and speed of operation. Available in 6 sizes ranging from 1”-4”, standard materials of construction include All Iron, CD4MCu and Rubber Lined. The 855 Series features an overhead v-belt drive arrangement as a standard with options for close coupled or frame mounted drives. By utilizing either belt drive or variable frequency drive, performance characteristics can be fine tuned to match most system requirements. Maintenance is simplified as the vertically split case may be disassembled to expose the entire wetted area.
Standard features include packed stuffing box with seal water connections provided to insure lubrication and eliminate vacuum/air leakage and 2” diameter stuffing box bore on all units. Pumps come with discharge flanges machined for both 150 lb/PN 10 connections, while duplex/17-4ph stainless steel shafts are utilized to both strengthen the shaft and eliminate the need for shaft sleeves. Impellers are keyed to the shaft, providing a secure fit and protection should momentary reverse rotation occur. The Swing-Out Mount is a popular optional feature allowing inspection of the pump or quick access to the tank interior. A companion pump, the 850 Series incorporates identical hydraulic characteristics and performance of the 855 as a standard mounted horizontal pump with flanged suction piping to suit the installation.
Ideally suited for condensate and vacuum services where NPSH is a problem, the 850 Series is also available in 6 sizes and includes the same features as the 855. Heavy duty baseplates and various levels of performance testing are also available, depending on the individual user requirements. Most importantly, as with all our other pumps, the 855 and 850 Series offer the reliability, low total life cost, and lasting value that has made Carver one of the most trusted names in pumps.