Cartridge-type steel filters are designed to safeguard downstream components such as regulators, valves, and meters from potential deterioration or damage by eliminating contaminants and foreign particles from the gas stream. Standard filter units are capable of removing particles with a size of 5 microns and above. Within the natural gas sector, a typical acceptable pressure drop across the filter cartridge is 100 mbar; however, this value is subject to variation based on operational requirements and can be specified within a range of 50 to 500 mbar at the time of ordering. These cartridge filters channel the incoming gas from the inlet port towards the lateral surfaces of the filter housing. As the gas traverses through the filtration media, solid particles at the micron scale are retained on the external surface, while entrained liquid droplets adhere to the outer walls. The purified gas then passes through the cartridge interior and exits via the outlet port. Unless expressly stated otherwise, each filter is equipped with a differential pressure gauge to monitor clogging levels, suitable for integration with SCADA systems. The gauge offers a measurement signal range of 0-1000 mbar, includes a dry contact output, and is pre-set to activate an alarm at 250 mbar unless alternate settings are requested. Solid and liquid accumulations must be discharged manually through the designated drain port located at the filter's base at defined intervals, and the cartridge should be cleaned or replaced concurrently. Cartridge replacement is straightforward and efficient. All filter units are produced in compliance with API 1104 standards. The overall filtration performance is influenced by various factors, including the structural design of the cartridge, frequency of maintenance, degree of gas contamination, system pressure, and gas flow velocity. Optional features include the integration of a Quick Opening Closure (QOC) for expedited access. Upon request, galvanized or stainless steel support plates can be mounted on the interior and exterior surfaces, as well as the top and bottom sections of the filters. Where radiographic inspection is impracticable, alternative non-destructive testing techniques may be employed to assess weld integrity.
• Application Areas: Applicable to gas transmission and distribution pipelines, pressure regulation and metering stations, as well as commercial and industrial gas systems, among other similar installations.
• Permissible Fluids: Natural gas, atmospheric air, LPG, propane, and other non-corrosive gaseous substances.
• Capacity Specification: Determined in accordance with the requirements of each specific project.
• Nominal Bore Sizes: DN25 through DN300.
• Pressure Ratings: Conforming to Class 150, Class 300, Class 600, PN6, PN16, PN25, and PN40 standards.
• Cartridge Classifications: Ranging from G0.5 to G3.
• Connection Configuration: Available in both in-line (straight) and angular formats.
• Filtration Efficiency: Equal to or exceeding 98%.
• Drainage Outlet Size: DN15 to DN25.
• Flange Connection Type: Provided with either gasket-sealed raised face flanges or welding neck flanges.
• Permissible Operating Temperature: From -20 °C to +60 °C.
• Dimensional Specifications: Tailored in accordance with project-specific parameters.
• Certification and Standards Compliance: Designed and manufactured in compliance with ASME Section VIII Division 1.
• Testing Procedures: Subject to hydrostatic testing at 1.5 times the design pressure (PSx1.5) and pneumatic testing at 1.1 times the design pressure (PSx1.1).
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