5 appendix, 1 inlet water quality requirements, Inlet water quality requirements – Nortec ME Direct Feed Installation User Manual

Page 43: Chapter 5.1 – inlet water quality requirements, 5appendix

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43

Appendix

5

Appendix

5.1

Inlet water quality requirements

Nortec Plc recommends that the Nortec ME must be connected to a

clean, wholesome (drinking water

quality) mains water supply. For areas of hard water and to minimise scale build up the water supply

may be treated by a reverse osmosis system (RO).

Reverse Osmosis
For Nortec ME systems supplied with RO water it is recommended that the system is operated within the

following parameters. The use of RO water fed tanks and reservoirs is only permitted as part of a man-

aged and hygiene monitored water system and should form part of the water system risk assessment.

System

Conductivity

Nortec ME Direct Feed

> 30 μS cm-1 at 20 °C (68 °F)

Other Water Supplies
There is a growing demand to utilise sustainable water sources to help overcome scarcity challenges

and recycle water. It is possible to use high-quality, treated effluent for non-wholesome applications. The

following gives guidance on reclaimed water quality that may be acceptable for use within the Nortec ME.

“Effluent treated water”, must be treated by an appropriate water treatment method and risk assessed to

ensure it is safe and suitable for use in the Nortec ME unit. It is the responsibility of the user to ensure

that the water supply system is part of a managed, hygiene monitored water system, risk assessed and

complies with the local regulations and bylaws.

Below are example water conditions that would allow a Nortec ME to operate within specification.

Parameter

Content in supply water

Concern

Temperature

< 20 °C (68 °F)

Warm water favours growth of bacteria

Aluminium

-

No specific concerns

Ammonium

< 0.50 mg/l

Odour passed to air

Calcium

< 300 mg/l

Scale formation

Chloride

< 300 mg/l

Corrosion of stainless steel

Colour

None

Not directly a concern

Copper

< 1 mg/l

Deposits and corrosion stimulation

Conductivity

< 650 μS cm-1 at 20°C (68 °F) Total hardness and scale formation.

pH

6.5 to 9.5

Acid or Alkali damage to equipment.

Iron

< 0.5 mg/l

Deposit formation on oxidation and a critical support

role in Legionella growth.

Manganese

< 0.1 mg/l

Deposit formation

Nitrate

-

No specific concerns

Nitrite

-

No specific concerns

Odour

Acceptable to users

Smell passed to air

Sulphate

< 250 mg/l

No specific comments

Sodium

-

No specific concerns

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