British standard BS EN 858-2:2003 Section 6 Operation, inspection and maintenance

British standard BS EN 858-2:2003 Separator systems for light liquids (e.g. oil and petrol) — Part 2: Selection of nominal size, installation, operation and maintenance provides specific guidance on how to maintain your interceptor, it states:

"All parts which have to be regularly maintained shall be at all times reachable. Maintenance of the system has to be carried out at least every six months by experienced personnel. The maintenance shall be carried out in accordance with the manufacturers instructions, but at least shall include the following items:

a) sludge trap

• determination of sludge volume

b) separator

• measure the thickness of light liquids

• check the operation of the automatic closure device

• check the coalescing devices for permeability, if the water levels in front and behind the coalescing device show significant difference

• check the function of the warning device

c) sampling shaft

• clean the drain channel

Light liquid and sludge shall be removed as required. Before putting in service sludge trap and separator shall be re-filled with fresh water.

NOTE Emptying is recommended when one half of the sludge volume or 80 % of the storage capacity of the separator is reached.

In exceptional circumstances, when personnel need to enter the separator, it shall be fully drained and thoroughly ventilated.

The regulations/decrees for avoiding accidents and the handling of dangerous materials shall be followed.

In intervals of at maximum five years the separator system shall be emptied and then submitted to general inspection covering the following items:

• tightness of the system;

• structural condition;

• internal coatings, if present;

• state of inbuilt parts;

• state of electrical devices and installations;

• checking of adjustment of automatic closure device, e.g. floating bodies.

The cleaning and maintenance records shall be kept and made available to the authorities upon request and shall contain remarks on specific events (e.g. repairs, accidents)."

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