Housing - Duplex Filters


Duplex basket filter & strainer permits continuous operation because flow can be switched back and forth between two filter sections. This allows one side to be serviced while the other is in use. Normally duplex basket filters are separated with three way ball valves or two way ball valve/ butterfly valve connected with equalization tee, between two baskets filter housing.

Operation of Duplex filters

Unfiltered liquid enters the basket housing and passes down through them. Duplex Basket filters & strainers are normally supplied with nut/bolt arrangement at the top of filter element. This will ensure any type of bypassing & confirm the position of basket, even in case of reverse flow. Fluid bypass around the basket is prevented by an optional O'-Ring seal between the basket rim and the housing inside diameter. The valves provided along with the assembly make sure you get intermittent operation.

Salient Features of Duplex filters

  • No shutdown time
  • Online change over to either of strainer vessels
  • Dimensionally flexibility due to fabricated construction
  • Both inline & offline connection available
  • All housings made from SS 316 L, SS 316 & SS304 are mirror polished to resist adhesion of dirt and scale
  • Carbon steel housings are Epoxy coated & finally painted with two coats of synthetic enamel
  • High temperature & high pressure design are available

Design Features of Duplex filters

  • Custom modifications available to suit customers required
  • Strainers designed to meet requirement of ASME section VIII div-I
  • Ball valve, gate valve butterfly or other valves can be provided as per requirement
  • 304 / 316 perforated screens / mesh are standard
  • Drain vents & differential connection are standard and are furnished with plugs

Material of Construction of Duplex filters

  • Carbon steel (All Grades)
  • Mild Steel
  • Caste steel
  • S.S. 304
  • S.S. 316
  • S.S. 316 L

Size Range

  • Connection Size – 1’’ to 16’’
  • Class #150 to #300

Application of Duplex filters

  • Process Industries
  • Chemical Industries
  • Oil & Gas Industries
  • Power Industries
  • Metal & Mining industries
  • Water & Waste management