Membrane Installation

Interconnector

Used to connect the permeate tube of one membrane to another, or the permeate tube of a membrane to the end cap of the pressure vessel (Figure 1). The interconnector uses o-rings to provide the seal.

Casing or Outer Wrap

Provides a rigid construction to maintain to the shape of the membrane element under pressure and to prevent membrane damage during handling. This is generally constructed from fiber reinforced plastic. Some 4” membranes are simply tape wrapped. The membrane manufacturer model number and serial number are typically visible on or through the outer wrap.

U-Cup Brine Seal

Forms a seal between the membrane element and the pressure vessel. The design is such that the pressure of the feed water opens the ‘u-cup” and forms the seal. This ensures that the feed water passes through the element and not around it.

Pressure Vessel

Pressure vessels house the membranes, typically from one to seven membranes per tube depending on the length of the vessel. Vessels are typically made of stainless steel or fiberglass reinforced plastic (FRP).

Loading of Membranes

Membranes should be loaded and removed in the same direction as the water flow. Glycerin (a water-soluble lubricant) should be used on the U-Cup seals and o-rings during the installation (see Figure 2). When installing membranes, record the membrane serial numbers and the location of each membrane within the vessel.