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Rotary Drum Vacuum Filter (RDVF) Calculator engineering
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Rotary Drum Vacuum Filter (RDVF) Calculator

Calculate continuous rotary drum vacuum filter surface area, submergence cake formation time, dry solids production rate, and vacuum pump airflow.

Drum Physical Dimensions & Speed

Slurry Filtration Characteristics

Typical range: 5 to 40 lb/hr·ft² for mineral/chemical cake.

Continuous Filter Performance

Dry Cake Production Rate
-- lb/hr
-- tons/day dry solids
Total Filter Area
-- sq ft
-- m²
Vacuum Pump Flow
-- SCFM
Est. -- HP blower
Submerged Form Time: -- sec/rev
Drying / Dewatering Time: -- sec/rev
Filtrate Liquid Output: -- GPM
Continuous RDVF operation provides unbroken solid-liquid separation without the downtime or cyclic batch dumping of filter presses.

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Frequently Asked Questions

What is drum submergence in an RDVF?

Drum submergence is the percentage of the drum filter area that is submerged in the slurry trough at any instant. Standard bottom-feed drums operate between 30% and 37.5% submergence. High-submergence designs (up to 50%) maximize cake pickup for dilute slurries, whereas low submergence provides longer cake washing and drying times.

How does drum rotational speed affect RDVF cake thickness and moisture?

Increasing drum RPM shortens the time each segment spends in the submergence zone, resulting in a thinner cake layer. Thinner cakes offer lower hydraulic resistance, producing higher dry solids throughput (lb/hr) but often slightly higher cake moisture due to reduced dewatering time.

When is a precoat rotary vacuum filter needed instead of standard cloth?

Precoat filters are used when treating dilute, slimy, or gelatinous slurries that would rapidly blind standard cloth media. A deep bed (2-4 inches) of diatomaceous earth or perlite is built up first, and an advancing micro-knife blade skims off a microscopic slice of precoat along with the trapped solids each revolution.