Industrial

Applications

Industrial

Process water, dosing, washdown, plant rooms and production services. Category 4 and 5 predominate.

Industrial process connections

Dosing, washdown and plant-room filling on a wholesome incoming main.

Risk reference

Connection type	BS EN 1717 category	Protection method	Notes
Chemical dosing	4–5	RPZ or Type A air gap	Category 5 if pathogenic / toxic concentrate
Washdown hose	5	Type A air gap	Cannot be a mechanical device
Filling loop	4	RPZ (BA)	Not a double check

Process water, dosing, washdown, plant rooms and production services. Category 4 and 5 predominate.

Connection types, BS EN 1717 category and the minimum protection method.

Connection type	BS EN 1717 category	Protection method	Notes
Chemical dosing	4–5	RPZ or Type A air gap	Category 5 if pathogenic / toxic concentrate
Washdown hose	5	Type A air gap	Cannot be a mechanical device
Filling loop	4	RPZ (BA)	Not a double check

Regulation guide

Tools & calculators

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Insight

Missing test cocks, inverted relief valves, and isolation that makes annual AIM testing impossible.

Insight

Closed heating and chilled circuits are Category 4. A double check on the filling point is not enough.

Insight

When a mechanical device cannot replace a Type A air gap — and how to dimension the weir.