MCU14/0056 Response to SARA - Consulting Report

EN 858-1:2002 (E)

Automatic closure devices shail-be easily maintained. Where closure devices are operated by floats they shall be
easily removable and adjustable, and shall be calibrated for light liquids with a density of 0,85 g/cm® or 0,90 g/cm®
or 0,95 gicm?,

When tested in accordance with 8.3.2 the leakage shall not exceed 100 NS of the separator, in millilitres, during a
period of 15 min.

Unauthorised removal of the automatic closure device shall be prevented.

6.5.4 Automatic warning devices and additional devices
Separator systems shall be provided with automatic warning devices.

NOTE Local authorities may allow the use of separators without automatic warning devices.

6.5.5 Separators with a bypass device

Where a bypass device is incorporated in a separator system the separator itself shall meet the requirements and
tests provided in this standard. The maximum flow rate of the separator related to its nominal size shall not be
exceeded.

NOTE The characteristics of the bypass device itself are not covered by this standard.
6.5.6 Determination of the nominal size and class

6.5.6.1 Prefabricated separators

The nominal size and class of prefabricated separators shall be determined by their performance when tested in
accordance with 8.3.3.1.

NOTE Prefabricated separators are those which are in whole, or in finished parts, produced in the manufacturers’
workshop.

6.5.6.2 Separators built in-situ

Separators built in-situ according to this standard are only permissible in. nominal sizes equal to or greater than
NS 150 and their use is subject to the approval of local authorities. When tested in accordance with clause 8 they
shall comply with the requirements given in clauses 6 and 7.

) The nomina! size shall be determined @1] as follows:

a) by testing in accordance with 8.3.3.1 against models having identical dimensions, components, design and
construction characteristics;

b) by constructing the separator system in accordance with the following guidelines:

The ratio of the width to length of the separator shall be between 1:1,5 and 1:5. The distance between the bottom
of the separator and the scumboard or the outlet pipe should be 20 % of the water depth H.

The minimum depth Afnin of water shail be 2,5 m including a depth of 0,15 m for the light liquid storage and a depth
of 0,35 m for possible sediment collection.

From the nominal size NS the minimum surface area Amin, the minimum total volume Vin and the minimum fight
liquid storage volume Vj min Can be calculated as follows:

Water surface, m?: Amin = 0,2 x NS
Total volume, m? : Vain =HXA=0,5XNS

Light liquid storage volume, m: V1 min = 0,03 x NS
g

This is a licensed reproduction produced by SAI Global Ltd, an authorized distributor of British Standards 15