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BS EN 12729:2023

BS EN 12729:2023

$167.15

Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A

Published By Publication Date Number of Pages
BSI 2023 36
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This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of controllable backflow preventers with reduced pressure zone, Family B, Type A. This document covers controllable backflow preventers of Family B, Type A, with reduced pressure zones, intended to prevent pollution of potable water by backflow, caused by backsiphonage or by backpressure. It is applicable to controllable backflow preventers in denominations DN 6 up to DN 250. It covers controllable backflow preventers of PN 10 that are capable of working without modification or adjustment: – at any pressure, up to 1 MPa (10 bar); – with any pressure variation, up to 1 MPa (10 bar); – in permanent duty at a limited temperature of 65 Ā°C and for maximum 1 h at 90 Ā°C. It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
10 3 Terms and definitions
11 4 Denomination
5 Designation
12 6 Symbolization
7 Physico-chemical characteristics
7.1 General
7.2 Materials
7.2.1 General
7.2.2 Dezincification resistant copper alloy
13 7.3 Surface coating
7.3.1 General
7.3.2 Epoxy coating
7.3.3 Polyamide powder based coating
8 Design
8.1 General
14 8.2 Relief valve
15 9 Characteristics and tests
9.1 General
9.2 General tolerances
9.2.1 Tolerance of set parameters
9.2.2 Accuracy of measuring instruments
9.3 Dimensional characteristics
9.3.1 Connections
9.3.2 Pressure taps
16 9.4 Mechanical characteristics
9.4.1 General
9.4.2 Mechanical resistance of the body under pressure
9.4.2.1 Requirement
9.4.2.2 Test method
9.4.3 Endurance
9.4.3.1 Requirement
17 9.4.3.2 Tests
18 9.4.4 Torque test of captive rotating nuts and bending strength ā€“ tightness of the body
9.4.4.1 Requirement
9.4.4.2 Test method
19 9.4.5 Reliability of stop valves fitted to test ports
9.4.5.1 General
20 9.4.5.2 Operating torque
9.5 Tightness characteristics
9.5.1 Verification of the tightness of the downstream check valve (in the closing direction)
9.5.1.1 Requirement
9.5.1.2 Test
9.5.2 Verification of the closing pressure of the downstream check valve and its tightness (opening direction)
9.5.2.1 Requirement
21 9.5.2.2 Test
9.5.3 Verification of the tightness of the upstream check valve at low pressure
9.5.3.1 Requirement
9.5.3.2 Test
22 9.5.4 Verification of the tightness of the upstream check-valve under vacuum
9.5.4.1 Requirement
9.5.4.2 Test
23 9.6 Hydraulic characteristics
9.6.1 Test rig ā€“ General circuit
24 9.6.2 Verification of the pressure loss as a function of the flow rate
9.6.2.1 Requirement
9.6.2.2 Test
9.6.3 Verification of the pressure difference between the upstream and the intermediate zones
9.6.3.1 Requirement
25 9.6.3.2 Tests
9.6.4 Verification of venting to atmospheric pressure of the intermediate zone when the upstream pressure drops
9.6.4.1 Requirement
9.6.4.2 Test
9.6.5 Verification of opening start of the relief valve and of its closing
9.6.5.1 Requirement
9.6.5.2 Test
26 9.6.6 Verification of the relief valve tightness in case of fluctuation of the upstream pressure
9.6.6.1 Requirement
9.6.6.2 Test
9.6.7 Verification of the intermediate zone pressure for a given relief flow rate under inverse feed
9.6.7.1 General
27 9.6.7.2 Requirement
9.6.7.3 Test
9.7 Compatibility with the products used for shock disinfection of the networks
9.7.1 Requirement
9.7.2 Test method
9.8 Acoustic tests
9.8.1 General
28 9.8.2 Procedure
9.8.2.1 Assembly of the devices
9.8.2.2 Test method
9.8.2.3 Determination of the group
10 Marking and technical documents
10.1 Marking
29 10.2 Technical documents
11 Presentation at delivery
30 Annex A (normative)General information for coating definition
A.1 Organic coating (paint)
A.2 Pre-treatment before coating
A.3 Application techniques
32 Annex B (normative)Evaluation of the degree of polymerization
B.1 Solvent resistance test
B.1.1 General
B.1.2 Operating procedure
B.1.3 Required characteristics

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BS EN 12729:2023
$167.15