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BS EN 16941-2:2021

$142.49

On-site non-potable water systems – Systems for the use of treated greywater

Published By Publication Date Number of Pages
BSI 2021 32
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This document specifies the principles of design, sizing, installation, identification, commissioning and maintenance of greywater systems with the purpose of use of greywater on-site.

It applies preferably for the use of treated greywater for:

  1. WC flushing;

  2. garden watering;

  3. laundry;

  4. cleaning purposes.

This document also specifies the minimum requirements for greywater systems.

Excluded from the scope of this document are:

  1. the use as drinking water and for food preparation;

  2. the use for personal hygiene purposes;

  3. direct use systems without treatment;

  4. product design for specific system components;

  5. industrial effluents;

  6. heat recovery and cooling demands.

NOTE

Conformity with this document does not exempt from compliance with the obligations arising from local or national regulations.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 European foreword
7 Introduction
8 1 Scope
2 Normative references
9 3 Terms and definitions
4 Functional elements and greywater quality
10 5 Design
5.1 General
11 5.2 Collection
5.3 Treatment
5.4 Storage
5.4.1 General
12 5.4.2 Materials
5.4.3 Dimensions
5.4.4 Capacity
5.4.5 Structural behaviour
5.4.6 Watertightness
5.4.7 Connections and internal pipe system
13 5.4.8 Access
5.4.9 Overflow
5.5 Back-up water supply
5.5.1 General
14 5.5.2 Backflow protection device
15 5.6 Pumping
5.6.1 General
16 5.6.2 Pumps for collected greywater
5.6.3 Pumps for treated greywater
17 5.6.4 Expansion vessel
5.6.5 Pump control unit
5.7 System control with monitoring
18 5.8 Metering
5.9 Distribution
6 Sizing
6.1 General
6.2 Calculation method
6.2.1 General
19 6.2.2 Demand and yield hierarchies
6.2.3 Basic approach
6.2.4 Detailed approach
21 7 Installation
8 Differentiation and identification
22 9 Commissioning
10 Quality of non-potable water
23 11 Testing of water quality
12 Maintenance
25 Annex A (informative) Greywater yield and demand
26 Annex B (informative) Types of greywater systems
27 Annex C (informative) Example of dye testing for distribution pipework cross-connections
29 Annex D (informative) Example for water quality requirements
31 Bibliography
BS EN 16941-2:2021
$142.49