bsen858-2-20xxseparatorsystemsforlightliquids(egoilandpetrol)—part2selectionofnominalsizein

bsen858-2-20xxseparatorsystemsforlightliquids(egoilandpetrol)—part2selectionofnominalsizein内容摘要：

ol of separator systems for light liquids. When pollution control requires the treatment of pollutants other than light liquids, additional measures can be necessary. The annexes A and B are informative. According to the CEN/CENELEC Internal Regulations, the national standards anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This European Standard applies to separator systems used to separate hydrocarbons of mineral origin from wastewater. It does not apply to grease and oils of vegetable or animal origin nor to separation of emulsions or solutions. This European Standard provides guidance on the selection of nominal sizes, as well as the installation operation and maintenance of light liquid separators manufactured in accordance with EN 8581. It also gives advice on the suitability of cleansing agents if they are discharged to a separator. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 7522, Drain and sewer systems outside buildings — Part 2: Performance requirements. EN 7524, Drain and sewer systems outside buildings — Part 4: Hydraulic design and environmental consideration. EN 8581:2020, Separator systems for light liquids (. oil and petrol) — Part 1: Principles of design, performance and testing, marking and quality control. 3 Copyright British Standards Institution Reproduced by IHS under license with BSI Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2020 06:12:34 MST Questions or ments about this message: please call the Document Policy Group at 3033972295. EN 8582:2020 (E) 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 8581 as well as the following term and definition apply. cleansing agent chemical substance which, when bined with light liquids, initially forms an emulsion during cleaning process that rapidly breaks down in the separator 4 Determination of type and size of separator systems General Separator systems are used in a wide variety of situations to fulfil a number of different requirements. It is important to establish why a separator system is needed and what specific function it is expected to fulfil before selecting the appropriate size and type of installation. Generally, separator systems are installed for one or more of the following reasons: a) to treat waste water (trade effluent) from industrial processes, vehicle washing, cleansing of oil covered parts or other sources, . petrol station forecourts。 b) to treat oil contaminated rainwater (runoff) from impervious areas, . car parks, roads, factory yard areas。 c) to retain any spillage of light liquid and to protect the surrounding area. Where there is no specific sizing method given by a regulatory authority the following guidance on sizing of the separator system shall be used: Components of separator systems, their bination and application General The ponent parts of separator systems plying with EN 8581 are listed in Table 1. Table 1 — Components of separator systems Components Code letter Sludge trap S Separator Class II II, II b (for bypass separators) Separator Class I I, I b (for bypass separators) Sampling shaft P Annex B gives guidance on the selection of ponents to suit particular applications. Bypass separators Bypass separators include a device to allow a flow in excess of the maximum permissible flow to bypass the separator. 4 `,``,`,`,`,`,`,``,``,`,`,`,` Copyright British Standards Institution Reproduced by IHS under license with BSI Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2020 06:12:34 MST Questions or ments about this message: please call the Document Policy Group at 3033972295. `,``,`,`,`,`,`,``,``,`,`,`,` EN 8582:2020 (E) Bypass separators are not suitable for category a) uses (see ). They shall be used only in locations where it is unlikely that there will be significant hydrocarbon contamination during times of heavy rainfall. Separator systems shall not surcharge or cause surcharging upstream when subject to their maximum design flow. Classes of separators Classes of separators (class I and II) are defined in EN 8581:2020, clause 4. Class I separators provide a higher degree of separation than class II separators (see Table for applications). Sizing of separators General The sizing of light liquid separators shall be based on the nature and flow rate of the liquids to be treated and will need to take account of:  maximum flow rate of rain water。  maximum flow rate of waste water (trade effluent)。  density of the light liquid。  presence of substances that may impede separation (. detergents). The sizing does not take into account special operational conditions (see ). The size of the separator shall be calculated from the following formula: NS  (Qr  f x。