TapTec™ LC HF-4040

TapTec™ Reverse Osmosis Elements


General Information

  • Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.
  • Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.
  • Avoid any abrupt pressure or cross-flow variations on the spiral elements during startup, shutdown, cleaning or other sequences to prevent possible membrane damage.
  • During start-up, a gradual change from a standstill to operating state is recommended as follows:
    • – Feed pressure should be increased gradually over a 30 – 60 second time frame.
    • – Cross-flow velocity at set operating point should be achieved gradually over 15 – 20 seconds.



Operating and Cleaning Limits
Membrane type Polyamide Thin-Film Composite
Maximum operating temperature  95°F (35°C)
Maximum operating pressure  600 psi (41 bar)
Maximum pressure drop 15 psi (1.0 bar)
Maximum feed flow rate, gpm (m3/h) 16 gpm (3.6 m3/h)
pH range
Continuous operation
3 – 10
2 – 12
Maximum Feed Silt Density Index  5
Free chlorine concentration  < 0.1 ppm