BS/EN 17110-2018 pdf download.Tanks for transport of dangerous goods – Service equipment for tanks – Vapour manifold vent valve.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition olthe referenced document (including any amendments) applies.
EN 12266-1:2012, Industrial valves — Testing of metallic valves — Part 1: Pressure tests, test procedures and acceptance criteria — Mandatory requirements
EN 12266-2:2012, Industrial valves — Testing of metallic valves — Part 2: Tests, test procedures and acceptance criteria — Supplementary requirements
EN 14564, Tanks for transport of dangerous goods — Terminology
ISO 2859-1. Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14564 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• TEC Electropedia: available at http://www.electropedia.org!
• ISO Online browsing platform: available at http:JJwwwisoQrgjohj
4 Functions
The vapour manifold vent valve
— shall provide controlled venting of the vapour manifold;
— shall be vapour tight when closed;
— may be provided with a flame arrester;
— may be self-operating;
— may be provided with an open/closed indicator;
5 Design characteristics
5.1 General
The vapour manifold vent valve shall provide a controlled vapour path between the vapour manifold and atmosphere.
The vapour manifold vent valve shall be closed during the process of vapour recovery, both loading and delivery.
Self-operating valves shall not compromise the vapour recovery process. Such valves shall be of the resealing type, and shall be designed to prevent unauthorized adjustment of the self-operating mechanism.
When not activated the valve shall return automatically to its passive state.
5.2 Pressure and vacuum breathing
When provided, the pressure and vacuum breathing characteristics shall be:
— pressure relief opening setting – not to exceed 12 kPa (gauge);
— vacuum relief opening setting – between —0,8 kPa (gauge) and —2,5 kPa (gauge).
5.3 Ingress protection
The vapour manifold vent valve shall be designed, or provision made, to meet the requirements of IP 21 in accordance with EN 60529.
5.4 Flow capacity
A flow performance against pressure drop diagram (standard m3/h at 20 °C) shall be provided by the manufacturer for pressure and/or vacuum functions.
5.5 Temperature range
Unless otherwise specified, the design temperature range shall be —20 °C to +50 °C.
Where the vapour manifold vent valve is subjected to more severe conditions, the design temperature range shall be extended to —40 °C or +70 °C as applicable.
5.6 Materials of construction
The manufacturer shall provide, with the equipment, a full material specification for those parts that may come into contact with the substances described in Clause 1.
5.8 Electrical resistance
The electrical resistance between any conductive part of the device which may come into contact with the dangerous goods and its mounting shall not exceed I I0 ft.
Provision shall be made for the bonding of its mounting to the tank such that the electrical resistance between the two shall not exceed 1011.
6 Tests
6.1 General
— Two classes of tests are required: production tests and type tests.
— Test results shall be recorded and maintained in accordance with the manufacturer’s procedures.
— Testing methods and procedures shall conform to EN 12266-1 and EN 12266-2 except as specified within this document.
— Unless otherwise specified, test medium shall be air or other suitable gas. The choice of the medium is the responsibility of the manufacturer.
Where the obturator forms part of the pressure containing shell, it may be closed during strength and tightness tests.
6.2 Production tests
6.2.1 General
The number, frequency and sampling methods of production test samples shall be not less than those specified within ISO 2859-1 (AQL of 2,5).
Production tests shall comprise the following:
— internal seat tightness test; and
— operability test.BS/EN 17110-2018 pdf download.