DL & DSbag-filters are only suited for dry gas and dry dust conditions.

These bag-filters should not be used for sticky dust or when gases are close to the dew point. Air/cloth ratio depends on the intended application.

The fans for DL & DS models in sizes 1,3 & 5 are mounted directly on the casing. Ducting connecting the bag-filter to the fan is not required. Outdoor applications do not require a stack and duct connecting the fan outlet to it.
DL & DS bag-filters are delivered assembled and ready for operation. The larger sizes are delivered in two assemblies and simply bolted together on site.
An air compressor can be mounted directly on the casing if a compressed air supply is not readily available
The proven success of the design (and relative low cost) of these bag-filters is the number of units sold over the last twenty years.


Bag-filter models designated DL

Bag-filter models with the designation DL have a hopper and a screw-conveyor below the bags.
These bag-filters are suited for general de-dusting applications such as conveyor-belt transfer points, bagging machines, silos, chutes, and bulk cement loading stations.
Dry dust and dry gas conditions are required for their satisfactory operation.
Two flanges (one on either side) are provided for easy connection of the gas inlet ducts.
In order to ensure correct gas distribution other gas inlet positions are not recommended.

Bag-filter models designated DS
Bag-filter models with the designation DS do not have a hopper and a screw-conveyor beneath the bags. They are termed bunker filters.
These are normally installed on top of silos (or whenever extracting gas from a closed space below). Dust is purged directly to the silo (or space) below.
A flange on the bottom of the bag-filter casing and a matching flange installed on the silo roof provide the mounting interface for the bag-filter.
A bottom flange on the bag-filter casing provides the connection point with a matching flange installed by the client on the silo roof.


Bag-filter series designated as type Q

Bag-filter series with the designation Q were introduced in 1991 to replace the previous cylindrical bag-filters designated as type M or N.
Most of components used are compatible with those in the corresponding sizes of the earlier type. However, they are arranged in a more traditional fashion where the bags are orientated vertically.
Corresponding sizes in the earlier and the later Q models have the equivalent performances.
The fans for QT & QS models in sizes 1,3, 5 & 8 are mounted directly on the casing.

Gas distribution in the QT models differs from that in the DL models, but it has also been carefully designed.
In the QT bag-filters the gas enters the hopper through a drop out chamber located on one side of the casing.
Coarse particles settle directly into the hopper while the gas is evenly distributed along the whole hopper.
Again, the relatively small bag size (100mm Ø x 2,250mm long) allows for a high cloth area density that aids the bag-filters being as compact as possible.
QT or QS bag-filters are delivered assembled and ready to start, except the ladders and platform must be fitted once at site.
For the larger sizes the hopper can be delivered separately and fitted at site.

There are no special limitations using these bag-filters. Any gas and dust that can be processed in other types of bag-filters can be processed in QT and QS bag-filters.
The maximum temperature limit for these bag-filters is 120 °C. The Air/cloth ratio depends on each specific application.

Bag-filter models with the designation QT have a hopper and a screw-conveyor below the bags.
These bag-filters are suited for general de-dusting applications such as conveyor-belt transfer points, bagging machines, silos, chutes, and bulk cement loading stations.

Flanges are provided for easy connection of the gas inlet ducts. In order to ensure correct gas distribution in the dropout chamber other gas inlet positions are not recommended.

Bag-filter models designated QS

Bag-filter models with the designation QS do not have a hopper or screw-conveyor beneath the bags and are normally installed on top of silos (or whenever extracting gas from a closed space below).
Dust is purged directly to the silo (or space) below.
A flange on the bottom of the bag-filter casing and a matching flange installed on the silo roof provide the mounting interface for the bag-filter.

A bottom flange on the bag-filter casing provides the connection point with a matching flange installed by the client on the silo roof.


Bag-filters Models designated SP or DP
Bag-filters with the model designation SP or DP cover a wide range of sizes, configurations and structural characteristics. All of them however share some common features:
• The basic module is 800mm long and 2,100mm wide has four rows each of ten bags and includes the cleaning system (four electro-valves 1"Ø), bags 3,000mm long, and a hopper section.
The bags are installed vertically and accessed by removing an inspection cover on the roof.
• The dropout chamber may have different shapes and orientation/location.
• Gas distribution is normally along the bag-filter longitudinal centreline.
The purpose of the dropout chamber is to reduce the gas dust-burden and to distribute the gas as evenly as possible over the hopper cross-section.
The length of these bag-filters is limited by the maximum gas speed across the hopper. In some cases a central dropout chamber makes it possible to extend the bag-filter length.

The bag-filters with the designation SP or DP are best suited for relatively easy applications up to 120OC, with an inlet gas dust-burden not exceeding 100g/m3 and negative pressure at the bag-filter inlet of less than 300mm WG.
Hundreds of Redecam SP & DP bag-filters have been installed for the following applications:
1. Centralized and general de-dusting, bagging machines, and ventilated mills
2. Inorganic pigment kilns, ferro-alloy ovens, crushers and screens, clinker and raw material storage
Air/cloth ratio range between 1 m/minute for fine cement mills and 1.8 m/minute for coarse non-abrasive dust applications (quarry, raw material storage, crushers and screens).

The following photographs show bag-filters with the SP designation. These photographs are intended as a guide only.
Each application is carefully considered before Redecam chooses the correct solution based on more than twenty years of accumulated experience.
The smaller sizes up to SP 10 x 10/3 can be delivered assembled.

Bag-filters of larger sizes are delivered in transportable sections:
• Left – the bag-filter heads
• Below – the hopper (inverted for transport)
• The sidewalls can be fabricated as panels or complete walls, depending on size.
• The bag-filters can be supplied with supporting structure(s), platforms, handrails, and ladders or stairs to meet the customer’s needs.

Bag-filters with pyramidal hoppers are fitted with a rotary air locks. For bag-filters with trough hoppers, these are fitted with screw-conveyors and rotary air locks.
The bag-filter gas inlets are carefully engineered to ensure proper gas distribution in the dropout chamber and subsequently in the bag-filter main body. Incorrect inlet positions can damage or shorten the life of the filter-bags.

These bag-filters normally have polyester or acrylic needle felt bags and the correct selection depends on gas conditions (temperature, humidity etc.). Where there is insufficient headroom two-piece cages can be supplied.
In most cases the bag-filters designated as DP filters are one off designs suitable for the special requirements of each application, and therefore cannot be strictly considered as standard bag-filters. In the following photographs are for reference only to give an indicative view of this bag-filter type.