BS EN 12178:2016 – TC:2020 Edition
$134.27
Tracked Changes. Refrigerating systems and heat pumps. Liquid level indicating devices. Requirements, testing and marking
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 40 |
This European Standard specifies safety requirements, safety factors, test methods, test pressures and marking of liquid level indicating devices, referred to throughout this standard as level indicators, for use in refrigerating systems and heat pumps. It applies to devices connected to refrigerant vessels (e.g. on high-pressure liquid receivers, intercoolers and low-pressure receivers) and to devices connected to other parts of a refrigerating system (e.g. oil-level sight glasses on a compressor). This European Standard applies to those types of level indicators that are direct and indirect reading devices (e.g. sight glasses, frosting tubes), and includes electrical and pneumatic indicators. This European Standard describes the procedure to be followed when designing (by calculation or by an experimental design method) level indicator parts subjected to pressure as well as the criteria to be used for the selection of materials. This European Standard applies to the design of level indicators with respect to pressure containment and describes methods by which the reduced impact values at lower temperatures may be taken into account in a safe manner. It also gives guidance on some aspects of application and installation.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 24 | Contents Page |
| 26 | European foreword |
| 27 | 1 Scope 2 Normative references 3 Terms and definitions |
| 29 | 4 List of Symbols 5 General requirements 5.1 Installation and operation |
| 30 | 5.2 Components under pressure 5.3 Excessive mechanical stress 5.4 Leakage 6 Materials 6.1 Material properties 6.2 New materials 6.3 Using non-metallic materials 6.4 Requirements for materials to be used for pressurized parts 6.5 Compatibility of connections 6.6 Ductility 6.7 Brittle fracture 6.8 Ageing |
| 31 | 6.9 Castings 6.10 Forged and welded components 6.11 Nuts, bolts and screws 6.12 Glass materials 6.13 Gasket materials 7 Design 7.1 General 7.2 Requirements for glass |
| 32 | Table 1 — Factor α |
| 33 | 7.3 Surface requirements 7.4 Corrosion protection 7.5 Inner cleanness 8 Fitting requirements |
| 34 | 9 Testing 10 Application 10.1 Liquid hammer 10.2 Frosting tubes 10.3 Liquid level indicators with magnetically operated indication 10.4 Maximum and minimum liquid level 11 Marking and additional information 11.1 General |
| 35 | 11.2 Marking 11.3 Level indicators of nominal size DN 25 and smaller 12 Documentation 12.1 Documentation for level indicators |
| 36 | Table 2 — Pressure as a function of temperature within the documentation of a level indicator (example) 12.2 Documentation for level indicators of nominal size DN 25 and smaller |
| 37 | Annex ZA (informative) Relationship between this European Standard and the essential requirements of EU Directive 2014/68 EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating … Table ZA.1 — Correspondence between this European Standard and EU Directive 2014/68 EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of… |
| 38 | Bibliography |
