Dry Gas Filters


KASRAVAND dry gas filters are designed to handle a variety of solid and semisolid particle removal applications. Standard design includes KASRAVAND Quick Opening Closure and z-bar 4 point element supports. Dry gas filters add the flexibility of using depth fiberglass, depth polyester surface, and rolled fiberglass filter elements to yield optimum economics and maximum performance under almost any service condition. Design is available in all major codes and certifications. Sizes range from 6" through 120" diameter in vertical and horizontal configurations.

For dry gas systems in need of cleaning, the KASRAVAND GAS DRY FILTER provides efficient removal of solid particulates down to 1 micron in size. The conventional forward-flow Dry Filter employs fiberglass filter elements, which are manufactured by kasravand Company. These units can be configured horizontally or vertically. An optional feature on the dry filter units is a self-cleaning manifold, which allows a back-flow stream to clean the filter elements while allowing the unit to continue operation in full service. All kasravand equipment is designed and fabricated by kasravand Company alone, allowing us to guarantee timely and dependable service to our customers.

Horizontal or Vertical Dry Gas Filters, are multistage devices that remove dust and other solids from gas and air, where no liquids are expected.  The basic design employs an inlet chamber containing a liquid/solid disengagement area and cylindrical cartridge filter elements.  The tubesheet merely supports the filter elements and creates a sealed outlet area for the exit nozzle.  Gas entering the first chamber passes across the standpipes supporting the filters, avoiding direct impingement on the filter elements.  Gas laden with solids enters the filter elements, where the solids are trapped.


Filter Separators are available with a choice of filter element sizes and micron removal ratings.  Peak performance is 99.9% removal of solid particles 3 microns and larger.  Over 99.5% of all solid particles 0.5 to 3 microns in size are removed.  Pressure drop with new/clean/dry filter elements is typically 2 PSI at maximum flow conditions.  However, this is not a limitation.  Lower or higher pressure drop designs are available, dependent on customer requirements.  Filter element differential collapse pressure is 35 PSI. 


The primary (inlet) chamber allows for placement of the inlet nozzle vertically or horizontally on the Horizontal Dry Gas Filters separator, and at any point radially on the Vertical Dry Gas Filters separator.  Outlet nozzles are typically in the downstream head for Horizontal Dry Gas Filters designs, and in any radial direction for the Vertical Dry Gas Filters design.  The Vertical Dry Gas Filters design will have the inlet nozzle in the upper half of the vessel, and the outlet nozzle will be in the lower half.  The primary (inlet) chamber for either design always contains filter.  The secondary exists solely as a connection point for the outlet nozzle in the "clean gas area".  An end closure (blind flange or quick opening closure) allows access to the filter chamber for replacement of elements.  For vessels with diameters 30" and larger, a reduced size closure may be provided.  Filter diameters can vary from 2" to 6", and from 18" to 72" in length.  Drain nozzles (if provided) are intended for use during initial hydrotest or subsequent cleaning.   Horizontal Dry Gas Filters designs are supported by integral saddles, and Vertical Dry Gas Filters designs may have either skirts or support legs.

Operating Principle:

When gas flows into a container, big and heavy solid particles drop into the container and gas passes through the cartridges inside the container. The small solid particles contained in the gaseous stream are filtered by a precision cartridge and then purified gas flows out of the filter through the outlet.

Dry gas filters can effectively protect instruments, valves, adjusting valves and other important devices.

Technical Parameters:

  • Production standard: GB150 or ASME VIII-1
  • Container material: carbon steel, stainless steel
  • Cartridge material: ultramicro glass fibre, polyester, polypropylene, nylon, etc.
  • Filtering accuracy: 0.3, 0.5, 1.5, 10μm
  • Filtration efficiency: 98~99% for solid
  • Mounting mode: horizontal or vertical

Typical Application:

Dry gas filters are widely used in petrochemical industries. It works on the exhaust stream to remove all solid impurities so as to protect critical instruments like valves and measuring instruments.