Candle Filters

Polishing Candle Filters

Steri CANDLE filters are a comprehensive enclosed system designed to effectively remove solids as small as 0.2 micron. These advanced back-pulse filters are particularly suitable for refining liquids to meet strict standards and demanding specifications. The vertical orientation of the vessel and filter elements allows for greater filtration surface area relative to footprint.

The versatility of these CANDLE polishing filters allows them to cater to a wide range of applications. Depending on specific requirements, the filter elements can be constructed with porous sintered metal, multi-layer media, or fabric filter cloth installed candles. Solids within the slurry are efficiently separated through the traditional outside-in filtration process. Discharging of the collected solids is accomplished using the back-pulse technique, utilizing either gas or a compatible liquid.

No Moving Parts

Totally enclosed filtration without any moving parts

Cost-Effective

Economical solution by maximizing surface area utilization, ensuring the lowest cost per unit of filtration space.

Polishing Filtration

Effective solid-liquid filtration down to .2 microns

Automatic Operation

Complete and automated solution for seamless operation

Why Choose A Candle Filter?

Most filters rely on solids collecting on the filter surface to achieve maximum effectiveness, essentially using the solids themselves to trap more incoming solids (i.e. dirt filtering dirt). As the cake builds on the filter surface, the cake resistance increases which causes pressure drop to increase and flow rate decrease. In the CANDLE filter, solids are removed from the slurry as the fluid passes through the filter media; outside-in filtration.  As the cake grows on the outside of the cylindrical CANDLE filter surface, the surface area also increases. This means that the cake thickness grows more slowly than it would on a flat-faced filter resulting in a more linear change in pressure and flow rate.

CANDLE Filter Design: Operate Without Moving Parts

 

Steri CANDLE Filters Have No Moving Parts
The Steri CANDLE filter design is meant to operate without any moving components. The few seals that are needed are static and not subject to wear. This increases the operational reliability and reduces maintenance requirements and costs dramatically. Due to its simplicity, the CANDLE filter serves a wide variety of applications.

 

Anatomy of a Steri CANDLE Filter
The CANDLE filter element is cylindrical in shape and can be installed in a single tube or arranged in a group inside of a larger vessel. In either case the individual CANDLE filter elements are connected to headers in a series and/or parallel arrangement. This arrangement is determined by Steri’s engineering team during the design phase based on the process results required. The headers are then connected to the main manifold though valves. Filtration and back-washing are controlled by these valves. Operation of the valves allows flow control in the CANDLE filter elements to optimize cake formation. Valve operation makes it possible for fine filtration and backwashing to be cycled from header to header.

 

Design Candle

 

CANDLE Filter Element: Designed for Fine Filtration
Each CANDLE filter element consists of a cylindrical perforated support structure. The filter media fits over the perforated support structure like a sock and is clamped in place. This rigid design allows for high pressure filtration. The replaceable filter media can be virtually any process compliant woven or sintered material. Steri has specifically designed CANDLE filter elements for efficient filtration while guaranteeing adherence of the filter cake to the cloth.

 

 

Endless Options for Your CANDLE Filtration Systems

A comprehensive set of options and Steri’s applications experience assure your precise requirements are met quickly and easily.

 

With numerous standard options and knowledgeable decision support from process experts, Steri’s CANDLE filtration systems can be easily configured to meet your specifications. What’s more, you’ll benefit from the flow of design enhancements Steri has been bringing on line each year.

 

Various options are offered for all Steri CANDLE filter systems. Steri offers a complete range of off the shelf options. Coupled with the engineering applications know-how, we can configure CANDLE filtration systems to your exact specifications. Choosing from a selection of standard components, that have been proven effective many times over, is a sure way to bring a customized system on line quickly and without problems.

 

Steri CANDLE Filters and FUNDA Filters – A Powerful Duo
When extremely high filtrate clarity is required, Steri can engineer an innovative solution by combining our FUNDA and CANDLE filtration. Steri CANDLE filters are designed as a totally enclosed system for the removal of solids as small as 0.2 micron. Used for fine polishing applications, Steri CANDLE filters can be installed in series, downstream from a FUNDA filter providing a total liquid-solid separation solution. All from one source. Steri Technologies.

 

 

Capacities

Candle Sizes

Dimensions

Size Number Of Candles* Candle Length Candle Area Candle OD A B C D E F
m2 Qty mm m2 mm mm mm mm mm mm mm
1.0 3 1200 0.34 90 1800 1300 250 1900 420 460
2.5 7 1200 0.34 90 1800 1700 250 2300 510 550
6.5 19 1200 0.34 90 1950 2050 300 2800 800 850
3.5 7 1800 0.51 90 2400 2000 250 2600 510 550
10.0 19 1800 0.51 90 2550 2350 300 3100 800 850
19.0 37 1800 0.51 90 2800 2800 400 3800 1100 1150
25.0 49 1800 0.51 90 3300 2500 600 4000 1300 1350
31.0 61 1800 0.51 90 3300 2700 600 4200 1500 1550
29.0 49 2100 0.60 90 3600 2800 600 4300 1300 1350
36.0 61 2100 0.60 90 3600 3000 600 4500 1500 1550
46.0 77 2100 0.60 90 3600 3100 600 4600 1600 1650
54.0 91 2100 0.60 90 3700 3200 700 4800 1800 1850
66.5 112 2100 0.60 90 3700 3400 700 5000 2000 2050

*Quantity of candles can be customized.

 

 

The Solution for Your CANDLE Filter Application

With a CANDLE filter by Steri Technologies, you can depend on cost-effective performance from the most efficient manufacturer. The fine chemistry CANDLE filter meets ASME or other industry standards and incorporates important functional enhancements designed by Steri engineers, each with a quarter century of hands-on CANDLE filter experience. This technology has an extensive record of reliable performance across a broad range of applications. Steri CANDLE filters are typically used as:

 

  • Pharmaceutical Filters
  • Fine Chemistry Filters
  • Food Industry Filters requiring FDA approval
  • Fuel and Oil Additive Filters
  • Hazardous Materials Filters
  • Precious Metal and other Catalyst Recovery Filters
  • Solid content: up to 2%

 

Theory of Operation

Candle Flow Filling

Filling
The slurry enters at the bottom of the filter vessel. The upward flow helps to keep the solids in suspension so that they are evenly deposited on the surface of the filter element.

 

 

 

Candle Flow Coating

Pre-coating
The suspension is circulated through the filter elements to produce a porous precoat layer.

 

 

 

Candle Flow Filtration

Filtration
The filter cake is formed on the outside of the filter candle while the clear filtrate is discharged from the interior of the candles through the header. The candle can form a 5 to 25mm thick cake.

 

 

 

Candle Flow Washing

Cake Washing
The wash liquid follows the same route as in filtration. The cake can be washed or reslurried in one or more stages.

 

 

 

Candle Flow Drying

Cake Drying
The cake can be heated and dried in the vessel using hot gases, such as steam, air or nitrogen.

 

 

 

Candle Flow Discharge

Cake Discharge
Discharging of the dry cake is by gentle gas expansion of the filter element, where gas is purged backwards through the filter, which pushes the dry cake off the filter surface.

 

 

Questionnaire

Process Filtration Questionnaire

 

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