GERMAN ATV-DVWK RULES AND STANDARDS

Transcription

1 GERMAN ATV-DVWK RULES AND STANDARDS STANDARD ATV-DVWK-A 134E Planning and Construction of Wastewater Pumping Stations

2 GERMAN ATV-DVWK RULES AND STANDARDS STANDARD ATV-DVWK-A 134E Planning and Construction of Wastewater Pumping Stations Publisher/Marketing: Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V. German Association for Water, Wastewater and Waste Theodor-Heuss-Allee Hennef Germany Tel.: Fax: Internet:

3 The German Association for Water, Wastewater and Waste, DWA (former ATV-DVWK), is the spokesman in Germany for all universal questions on water and is involved intensely with the development of reliable and sustainable water management. As politically and economically independent organisation it operates specifically in the areas of water management, wastewater, waste and soil protection. In Europe the DWA is the association in this field with the greatest number of members and, due to its specialist competence it holds a special position with regard to standardisation, professional training and information of the public. The ca. 14,000 members represent the experts and executive personnel from municipalities, universities, engineer offices, authorities and businesses. The emphasis of its activities is on the elaboration and updating of a common set of technical rules and standards and with collaboration with the creation of technical standard specifications at the national and international levels. To this belong not only the technical-scientific subjects but also economical and legal demands of environmental protection and protection of bodies of waters. Imprint Publisher and marketing: DWA German Association for Water, Wastewater and Waste Theodor-Heuss-Allee 17 D Hennef, Germany Tel.: Fax: Internet: kundenzentrum@dwa.de Translation: Richard Brown, Wachtberg Printing (English Version): DWA ISBN-13: The translation was sponsored by the German Federal Environmental Foundation (DBU) Printed on 100 % Recycling paper. DWA Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e.v., Hennef 2007 (German Association for Water, Wastewater and Waste) All rights, in particular those of translation into other languages, are reserved. No part of this Standard may be reproduced in any form - by photocopy, microfilm or any other process - or transferred into a language usable in machines, in particular data processing machines, without the written approval of the publisher. 2

4 Foreword Standard Specification EN Drainage systems outside buildings, Part 6 Pumping stations, elaborated by its Technical Committee TC 165 Wastewater Engineering, has been issued by the European Committee for Standardisation (CEN). It was to be adopted into the German Standards as DIN EN Supplementary to this the earlier Standard ATV-A 134 Planning and Construction of Wastewater Pumping Stations with Small Inflows has been revised and expanded by ATV Specialist Committee 1.3 Wastewater pumping stations, so that it can be applied, like the standard specification, for small and large wastewater pumping stations including their pressure mains. Standard ATV-DVWK-A 134E supplements Standard Specification EN and provides advanced information and proposals as to how, taking account of economic aspects, pumping stations can be planned and built. EN 1671 is to be applied for pumping stations with pressure drainage. It deals exclusively with the employment of rotodynamic pumps for the conveyance of wastewater, for which they are mainly employed. This does not, however, exclude other delivery plant (see Kommunale Abwasserpumpwerke [Municipal wastewater pumping stations], Vulkan-Verlag,). Statements made here also apply equally for such pumping stations so far as they do not demand other technical solutions. It would be beyond the framework of the Standard to go into these in detail. Conveyor spirals with their completely different delivery principle and thus also other structural concept are also dispensed with, although it is just these which are relatively frequently employed to raise wastewater before the wastewater treatment plant. The special requirements affecting these are laid down in Standard Specification DIN 1184 Part 4 Pumping stations; Archimedean screw pumps; directives for planning. Taking into account the wastewater-specific requirements (e.g. explosion protection) indicated in this Standard, these apply equally for wastewater pumping stations. Facilities in the field of wastewater as a rule are used for a long time. They must, in addition, have a high availability for the protection of surface waters against pollution and for the securing of local hygiene. Great significance is given to ideas on quality. Cost reductions are possible. They may, however, not be at the expense of the environment. With a comparison both investment costs as well as operating costs are always to be considered with the annual costs arising from both components. 3

5 Authors This Standard has been elaborated by the ATV-DVWK Specialist Committee ES-3 Wastewater Pumping Stations within the ATV-DVWK Main Committee ES Drainage Systems. ATV-DVWK Specialist Committee ES-3 has the following members: EVERS, Peter Dr.-Ing., Essen HAENDEL Heinz Dipl.-Ing., München ( 1997) HANITSCH, Peter H. Dipl.-Ing., Frankfurt am Main (Vice Chairman) KOCH, Günther Dipl.-Ing., Stuttgart NAUPOLD, Lutz Dipl.-Ing., Bremen TOCHTERMANN, Wolfgang Dipl.-Ing., Berlin (Chairman) TORNOW, Manfred Dipl.-Ing., Berlin ZANDER, Bernd Dipl.-Ing., Braunschweig In addition the following have collaborated: MAHRET, Hansjoachim Dipl.-Ing., Berlin WARNOW, Dietrich Dipl.-Ing., Berlin 4

6 Contents Foreword... 3 Authors... 4 List of pictures... 7 User Notes Area of Application Planning and Dimensioning Type of Structure and Structural Dimensions of the Pumping Station Wastewater Inflow Ordinates and Pumping Heads Pumping Task Expansion Possibilities Minimum Completely Free Passage Flow Rate and Inside Diameter of the Pressure Main Number of Cycles of the Pumping Plant and Dimensioning of the Inlet Chamber Digestion of the Wastewater Structural Engineering Methods of Laying Foundations Verification of Stability Building Protective Measures Design of the Structure Inlet Chamber Machinery Room Superstructure, Entrances Stairs, Ladders, Step Irons, Platforms Heating/Heat Removal Windows, Doors Earthing Lightning Protection External Design and Outside Facilities Connection of Pipelines, Protective Pipes and Similar to the Building Mechanical Engineering Rotodynamic Pumps Design of the Pumps Impeller Shapes and Completely Free Passage Notes on Design Type of Mounting Horizontally Mounted Pumps (Dry-well Installation) Vertically Mounted Pumps (Dry-well Installation) Submerged Pumps (Wet-well Installation) Pump Drives Electric Motors Combustion Engines Pipelines in the Pumping Station

7 4.4 Gate Valves Gate Valves with Elastomer Coated Obturators Parallel Slide Gate Valves Tapered Gate valves Non-return Valves Pump Air Bleeding Admission Gate Valves Water Supply Facilities Washdown Facilities Machinery Room Drainage Ventilation Facilities for Machinery Rooms Ventilation Facilities for Inlet Chambers Lifting Gear Electrical Engineering External and Structural Prerequisites Energy Supply Energy Supply with a Voltage up to 1000 V (Low Voltage) Energy Supply with a Voltage over 1000 V (Medium High Voltage) Measurement of Consumption Switchboard Plant, Actuators and Appliances Main Drives Ancillary Drives Ancillary Facilities Operating and Measuring System Emergency Power Supply Types of Protection and Regulations Explosion Protection Protection against Accidental Contact Measurement Engineering Level Measuring Systems Delivery Pressure Measuring Systems Flow Measuring Systems Transmission of Measured Values Wastewater Pressure Pipelines Pressure Pipelines Pipeline Routes Dimensioning Stresses Pipe Materials Corrosion and Corrosion Protection Commissioning Pumping Station Pressure Main Information on Standard Specifications, Directives, Standards, Advisory Leaflets (Selection) General Terms and Conditions for Engineering Services, (VOB) Standard Specifications

8 9.2.1 Building Standards Pipes and Fittings Mechanical Engineering Measurement Technology Electrical Engineering Directives, Standards and Advisory Leaflets of the ATV of the DVGW of the VDI of the VDMA [German Association of Mechanical Engineering Establishments] Annexes Annex 1: Example of a pumping station with rotodynamic pumps in horizontal, dry-well installation Annex 2: Basic circuit diagram List of pictures Fig. 1: Examples for types of pumping station construction with pumps in dry-well installation... 9 Fig. 2: Examples of types of pumping station construction with pumps in wet-well installation Fig. 3: Examples of inflow hydrographs with dry weather, mainly residential area Fig. 4: Examples of inflow hydrographs with dry weather, strong industrial influence Fig. 5: Pumping diagram rotodynamic pump Fig. 6: Single port non-clog impeller Fig. 7: Multi-port non-clog impeller Fig. 8: Spiral non-clog impeller Fig. 9: Non-chokable impeller Fig. 10: Cross-section of a horizontally mounted rotodynamic pump Fig. 11: Dry-well and horizontally mounted rotodynamic pump with fitted motor Fig. 12: Dry-well and vertically installed rotodynamic pump Fig. 13: Section of a wet-well and vertically installed submerged motor pump Fig. 14: Integration of the pump pressure main Fig. 15: Tapered gate valves with respectively internal ad external spindle threads Fig. 16: Gate valves with elastomer coated obturators Fig. 17: Parallel slide gate valve Fig. 18: Check valve Fig. 19: Basic forms for ready-built stations

9 User Notes This Standard is the result of honorary, technical-scientific/economic collaboration which has been achieved in accordance with the principles applicable therefore (statutes, rules of procedure of the ATV- DVWK and the Standard ATV-DVWK-A 400). For this, according to precedents, there exists an actual presumption that it is textually and technically correct and also generally recognised. The application of this Standard is open to everyone. However, an obligation for application can arise from legal or administrative regulations, a contract or other legal reason. This Standard is an important, however, not the sole source of information for correct solutions. With its application no one avoids responsibility for his own action or for the correct application in specific cases; this applies in particular for the correct handling of the margins described in the Standard. 1 Area of Application The pumping station, with the discharge of wastewater, has its particular significance in that, through the avoidance of too deep a position, it can improve the economic efficiency of a drainage system. It is extensively independent of topographical conditions and makes it possible to feed effluents into receiving waters and sewers even at high levels. Furthermore, using pumping stations, wastewater can be conveyed for widely spread catchment areas to treatment facilities sited at suitable locations. Wastewater pumps, which are mainly installed in the tank facilities (see ATV-A 166 [Not available in English]), are also frequently employed for the surface feeding and, in particular, for the emptying of stormwater tanks. The Standard applies analogously for these, however the technical requirements are to be matched to the tank-specific requirements (e. g. impeller shape, completely free passage, no continuous operation). Pumping stations are also suitable for control of flow in larger networks. It is emphasised, that this Standard is not to be employed where special drainage methods are used. These cases are dealt with in Standard ATV-A 116E. 2 Planning and Dimensioning The pumping station has to be so dimensioned that, with the taking into account of sufficient reserves the same disposal security as with discharge under gravity is achieved. The basic requirements to be placed on a wastewater pump are an automatic, fault-free operation with which the unhygienic and hazardous maintenance tasks remain limited to a minimum. The initial considerations to be made for planning and dimensioning, the relevant factors for the selection of terrain or location as well as the decisive criteria for the dimensioning and equipping of the pumping station are presented in detail in EN 752. The following notes serve as supplement. The layouts of the routes for the supply and disposal pipelines and the method of their laying are to be agreed with the authorities representing public interests. Rights of way for pedestrians, vehicles and pipelines are, if necessary, to be agreed. 8