【正文】 A is the area receiving rainfall, measured horizontally, in ha。 Qs1(4 bar) is the flow from drawoff point as given in Table 4, in l/s. Automatic car washes (rollover, drivethrough) Wastewater from low pressure car washes (with a back pressure up to 20 bar) where only carriage bodies and chassis are cleaned does not usually contain any significant amount of light liquid. Should there be wastewater from high pressure car washes (with a back pressure higher than 20 bar) and/or any additional washing procedures which wi ll result in wastewater containing light liquids, then for every car wash place or drive through a wastewater value Qs2 of 2 l/s plus a wastewater value Qs3 for each high pressure unit in accordance with shall be included. When the car wash place is multiple used, e. g. for maintenance, for plants with higher quantities of waste water i. e. without mechanical cleaning devices, the actual quantity of waste water has to be considered. 7 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) A reduction of the wastewater flow rate Qs2 for plants with water recirculation and overflow into a sewer is not admissible. High pressure units Irrespective of the effective use of water from a high pressure unit, a wastewater value Qs3 of 2 l/s shall be considered. If there is more than one high pressure unit an additional 1 l/s shall be included for each unit. If a high pressure unit is being used together with an automatic car wash for this unit a wastewater value Qs3 of 1 l/s shall be included. Rainwater flow rate For category b) uses (see ), the size of the separator will depend on the design, rainfall intensity and the catchment area draining to the separator. The maximum rainwater flow rate Qr in l/s shall be calculated using equation (4) in accordance with EN 7524. Qr = ? 2nd point DN 25 = 1,7 l/s。 up to 0,85 over 0,85 up to 0,90 over 0,90 up to 0,95 Combination Density factor fd SIIP 1 2 3 SIP 1 a 1,5 a 2 a SIIIP 1 b 1 b 1 b a For class I separators operating by gravity only, use fd for class II separator. b For class I and class II separators. Cleansing agents Cleansing agent manufacturers shall submit a declaration stating that the product is free from anically bined halogen pounds or BTX aromas. Only cleansing agents which form temporary stable emulsions with light liquids and then deemulsify after the cleaning process should be used. Instructions for use shall also be provided, together with the effects of mixing with other cleansing agents, particularly regarding the separation process. Combined drainage of rainwater and wastewater If a separator is receiving rainwater and wastewater, . from vehicle washing, and the two maximum flows are not expected to occur simultaneously, then the separator can be sized for the higher flow rate. Wastewater The wastewater inflow in accordance with , case a), shall be calculated as the sum of the contributing flows from the following formula: Qs ? Qs1 ? Qs 2 ? Qs3 ? ... (2) where Qs1 is the flow from drawoff points, in l/s。 Qr is the maximum flow rate of rainwater, in l/s。 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。 I S C H ES KOM I TEE F 220。223。gers (par exemple hydrocarbures) Partie 2: Choix des tailles nominales, installation, service et entretien Abscheideranlagen f252。 BSI 15 April 2020 ISBN 0 580 41600 3 Summary of pages This docum ent prises a front cover, an inside front cover, the EN title page,