Hola a todos, lo correcto y lo legal al menos en la mayoria de paises, es colocar valvulas de cierre en las dos salidas al medidor, al igual que el tubo de medicion ha de estar protegido por algun tipo de carcasa.
Las valvulas (grifos) se abren para mirar el nivel y acto seguido se cierran y permanecen asi hasta que se vuelva a consultar el nivel, asegurandose asi la ausencia de fugas debidas a un accidente, rotura, etc..
Por supuesto no estan permitidos estos niveles en tanques de gasolina.
Un ejemplo de legislación (Inglesa)
Fuel gauges- column sight tube
For many years the use of plastic or glass fuel sight tube gauges was not recommended practice in the UK as they were felt to be breakable, required a joint at or near the base of the tank, were exposed to physical damage and breached the fire resistance requirements of the tank.
This applied to all gauges of this type including those which are not errantly charged with fuel i.e. fuel is only admitted to the sight tube by means of a cock or valve for the purpose of taking a reading.
However, BS EN ISO 10088 allows their use on
diesel tanks only provided that they are protected against physical damage and that damage does not lead to the loss of the contents of the tank. This is achieved by the use of a shield or cage, or by robust design, and by the incorporation of self closing valves which means that the gauge is only open to the tank when the operator is in attendance at the gauge.
Disconnection
Where a sight tube gauge has been disconnected to comply with this standard, the tank outlet must be fitted with a plug which;
- Is connected to the tank by a leak proof connection
- Cannot be opened accidentally
- Cannot be used without the use of tools
(note that the self-closing valve at the top is not required if the gauge connection is made to the top of the tank)
Petrol tanks must not be fitted with glass or plastic tube or strip-type fuel gauges.
Un saludo y unas
