All units incorporate a tank shut-off device to allow the shaft seal and bearings to be changed under full tank conditions. The tank shut-off mechanism incorporates tapered metal to metal faces, positively clamped by a bolted flange which both seals products in the tank and securely supports the shaft during bearing and/or shaft seal changes.
All tapered faces are wear and corrosion resistant. The most important aspect of the Plenty Shut-off and mechanical seal assembly is that it incorporates a safety check valve for ensuring that the shut-off is 100% effective before removal of any bearings or the mechanical seal. The Plenty shut-off mechanism offers complete safety and security as it does not incorporate any flexible O rings or gaskets which may deform, wear, or perish.
The Plenty standard seal leakage detection system provides an economical solution to alert the operator of leakage passed the mechanical seal. Any leakage is collected and contained within a collection vessel that is equipped with a level sensor that can activate an alarm in the control room.
A horizontal foot mounted motor is fitted above the main mixer frame on a steel mounting plate which allows adjustment for correct belt tensioning.
Hinge pins and adjusting screws etc. are corrosion protected against atmospheric corrosion. The motor and mixer shafts are connected by a Fire Resistant Anti-Static (FRAS) High Torque Drive (parallel or angle offset) Tooth Belt correctly sized to transmit motor power. The pulleys have taper lock bushes for ease of removal and are enclosed in a spark-proof and weatherproof guard. Drive service factor is 1.5 minimum.
The main mixer frame is a rigid one-piece casting spigot located to the steel mounting flange and incorporating pre-lubricated, sealed for life, and hermetically sealed shaft bearings. The mounting flange incorporates a single mechanical seal with corrosion and wear-resistant tank shut-off device permitting seal and bearing replacement under full tank conditions.
Belt driven mixers are available in both fixed angle and swivel angle models.