【導讀】PolicyGroupat303-397-2295.PolicyGroupat303-397-2295.`,,,,``,`,,,,`,,,`,,`,`,``,,EN858-2:2020.StandardsOnline.PolicyGroupat303-397-2295.`,,,,``,`,,,,`,,,`,,`,`,``,,

　　

【正文】 f 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 = ? i A (4) where i is the rainfall intensity, in l/s ha。 A is the area receiving rainfall, measured horizontally, in ha。 ? is a dimensionless runoff coefficient. In most cases the value of the runoff coefficient can be taken as ? = 1. The rainfall intensity i mainly depends on the analysis of local rainfall data and shall be adopted according to local regulations. For very large rainfall receiving areas, the rainwater flow can be divided by catchment areas and drained into several separators. NOTE Surface areas covered by a canapy will receive reduced rainfall. For the purpose of the equation (4), the value A may be reduced for these areas. Spillages For category c) uses (see ) separator systems shall be sized sufficiently to retain any spillage of light liquid. A higher storage capacity may be necessary. Quantity of light liquid When, in certain cases, a higher light liquid storage capacity than that specified in EN 8581 is required, . when more than the usual amount of light liquid is expected, the following options can be considered: a) using a larger nominal size separator than calculated or b) creating light liquid storage capacity outside the separator or c) emptying the separator more frequently than usually. 8 `,``,`,`,`,`,`,``,``,`,`,`,` 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) Special cases Separators operating under special conditions, . for transformer stations, pressor stations, shall be reviewed on a sitespecific basis. Separators receiving wastewater from trade or industrial manufacturing processes may need to be specially sized after investigating the position and properties of the wastewater. Sludge traps Sludge traps shall only be fed from the design inlets and not positioned to allow flow directly from the surface. NOTE This does not apply to drainage channel type silt collection, . in car washes, to retain solids. Separator systems shall incorporate a sludge trap either as a separate unit or as an integral part of the separator. The volume can be determined as given in Table 5. Table 5 — Volume of sludge traps Quantity of sludge anticipated for .: Minimum sludge trap volume l None condensate Not required Small processing waste water with defined small sludge volume all rainwater collecting areas where a small amount of silt from traffic or similar appears, . catchment basins on petrol tank areas and covered filling stations a 100 ? NS f d Medium filling stations, carwash by hand, part washing bus washing places waste water from garages, vehicle parking lots power plants, machinery plants b 200 ? NS f d High washing plants for site vehicles, site machines, farm machines truck wash places 300 ? NS b f d automatic car washes . rollover, drivethrough 300 ? NS c f d a Not for separators smaller than or equal NS 10, except for covered car parks. b Minimum volume of sludge traps 600 l. c Minimum volume of sludge traps 5000 l. 5 Installation Limitations Separator systems shall only be installed on drainage systems where light liquids need to be separated from water and retained within the separator. They shall not be installed on drain and sewer systems containing domestic wastewater. The drainage of areas where light liquids are unlikely to occur, such as roofs and grassed areas, should not discharge through separators. 9 `,``,`,`,`,`,`,``,``,`,`,`,` 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) Retention of light liquid Separator systems shall be installed with automatic closure devices which ensure that no stored light liquid passes into the outlet of the separator. Automatic closure devices operated by floats shall be adjusted and marked for densities of 0,85 g/cm179。, 0,90 g/cm3 or 0,95 g/cm3 in accordance with the anticipated density of light liquid. Automatic warning devices and electrical devices Electrical warning devices for light liquids and other electrical devices housed in the separator shall be suitable for operation in a zone 0 hazardous area (see Directive 94/9/EC). Drainage to and from separator systems All drainage to and from separator systems shall be in accordance with EN 7522. Pipes and connections to the separator system shall be resistant to the light liquids. Place of installation Separator systems shall be installed close to the source of the light liquid, in well ventilated areas and easily accessible for clean