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Gas Filters

Dry cartridge filters for gas stations

A natural gas filter, also called a station filter or cartridge filter, stops dust, welding slag and other solid particles before they reach pressure regulators, valves and meters.

This page covers two Pietro Fiorentini ranges: the HFA-HFB dry gas filter for high and medium pressure up to 100 bar (filtration grades from 1 to 50 micron), and the Filters for Low Pressure for distribution lines up to 10 bar, supplied for gas networks and industry in Saudi Arabia and the GCC: the UAE, Qatar, Kuwait, Bahrain and Oman.

Gas Filters: products

Pietro Fiorentini low pressure cartridge gas filters (Mod. 50000, Mod. 10000) with aluminium body
Gas Filter

Filters for Low Pressure

Gas filters for low pressure applications, preventing foreign bodies from reaching critical points.

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HFA in-line and HFB 90-degree dry gas filters, 5 micron cartridge, by Pietro Fiorentini H2 Ready
Gas Filter

HFA-HFB

Specialized filter line for reliable gas transport and distribution.

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5 micron cartridges

HFA-HFB filters to 5 micron as standard with 98% efficiency; 1, 3 or 50 micron on request.

Up to 100 bar

HFA-HFB design pressure up to 100 bar, with PN 16 or Class 150, 300 and 600 flanges.

Large dirt collection

Collecting capacity above 12% of total filter capacity, with a drain on the bottom part.

Clogging indicator option

Differential pressure clogging indicator, with or without a remote reed-contact switch, shows when cartridges need attention.

How to choose a natural gas filter

Start with the maximum pressure at the filter inlet, then size the cartridge for the flow.

  • Above 10 bar: HFA-HFB

    Above 10 bar, for example in a pressure reduction and metering station, choose the HFA-HFB (design pressure up to 100 bar); it has no pressure limiting device: keep the inlet below its maximum allowable pressure.

  • Allowable pressure by flange

    The allowable pressure depends on the flange class: 16 bar with PN 16, 19 bar with Class 150, 50 bar with Class 300 and 100 bar with Class 600, at 50 °C.

  • Cartridge sizing formula

    HFA-HFB filtering area: A = Q / (P x V x 3600), with Q the flow in Stm³/h, P the absolute pressure in bar and V the gas speed at the cartridge (0.33 m/s suggested).

  • Cartridge sizes

    Cartridges run from G 0.5 to G 6 for line sizes from DN 25 to DN 300; the standard cartridge is 5 micron with 98% filtering efficiency.

  • Body type by piping

    Pick the body that fits the piping: the HFA has in-line nozzles, the HFA TRC adds a quick-opening closure for vertical installation, and the HFB has nozzles at right angles.

Low pressure filters and maintenance

  • Low pressure filters

    Filters for Low Pressure: aluminium alloy bodies (EN AB 46100) to DIN 3840 and EN 12516 for natural gas, LPG and other non-corrosive gases; the Mod. 50000 (10 bar) uses a 5 micron cloth cartridge.

  • Compact and 50 micron models

    The Mod. 10000 (1/2 and 3/4 inch, 50 micron) protects wall mounted boilers, water heaters and light commercial appliances; the 106-106/F (10 bar) and 10210/F (2 bar) use 50 micron elements up to DN 150.

  • Maintenance

    Both ranges collect more than 12% of the total filter capacity in the bottom of the body, with a drain; a clogging indicator (remote reed-contact switch optional on the HFA-HFB) shows a loaded cartridge.

  • What to send us

    Our Al Khobar team can check filter sizing for stations in Jubail, Riyadh, Doha or Muscat.

Frequently asked questions

What is the difference between a gas strainer and a gas filter?

A strainer is a coarse screen that catches large debris. A gas filter uses a cartridge to hold back fine solid particles. The HFA-HFB cartridge is polyester felt on a drilled, reinforced steel support and filters to 5 micron as standard, while the Mod. 50000 low pressure filter uses a 5 micron cloth cartridge. Fine filtration protects regulators, valves and meters downstream and reduces their maintenance.

What micron rating is used for natural gas station filters?

The HFA-HFB dry gas filter has a 5 micron cartridge as standard, with 1, 3 or 50 micron grades on request and 98% filtering efficiency. In the low pressure range, the Mod. 50000 filters to 5 micron, while the Mod. 10000, 106-106/F and 10210/F are 50 micron, with 150 or 300 micron on request for the 106 and 10210 models. Match the grade to what the downstream regulator and meter require.

When should a gas filter cartridge be replaced?

Change the cartridge when the pressure drop across it rises, which shows that particles are building up. The HFA-HFB can carry a clogging indicator, with or without a reed-contact remote switch, and the Mod. 50000 accepts a differential pressure clogging indicator. Drain the impurities that collect at the bottom of the body regularly. The HFA-HFB technical manual covers cartridge replacement for flanged heads and quick-closing heads.

What is the difference between the HFA and HFB filters?

Both are dry cartridge filters for natural gas, town gas and other non-corrosive gases, with design pressure up to 100 bar and PN 16 or Class 150, 300 and 600 flanges. The HFA has in-line nozzles and can be installed vertically or horizontally; the HFA TRC version is vertical only and opens through a quick-opening closure. The HFB has nozzles at right angles, for lines that change direction at the filter.

Do you supply gas filters in Saudi Arabia and the GCC?

Pietro Fiorentini Saudi Industry in Al Khobar supplies and supports the HFA-HFB and the Filters for Low Pressure for gas stations, distribution networks and industrial users in Saudi Arabia, the UAE, Qatar, Kuwait, Bahrain and Oman. Send us the gas, flow rate, inlet pressure, line size and flange class, and we will propose a filter and cartridge size with our quotation.

Guide: Gas Pressure Reducing Station: PRMS Components, Types and Design

Need Help Selecting the Right Filter?

Send us your gas, pressures and flow and our engineers will recommend the right model.

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