All tanks are provided complete with service and safety accessories (Directive 97/23/EC) and defined in detail in standard UNI EN 14570/2014. The accessories are essential for the correct operation of LPG plants and are installed on tanks directly by the manufacturer. The technical characteristics of the accessories form part of the documentation provided with the registration document accompanying each tank.

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A service unit is fitted to the tank that meets various operational and safety requirements.
It consists of a single block with the following elements:

  1. Pressure control gauge
  2. Flange for sample pressure gauge
  3. Gas phase supply connection
  4. Tap to seal off pressure gauge
  5. Suction tube system
  6. Gas phase shut-off wheel


Tanks are fitted with a spring safety valve combined with a sub-base valve (model, type and validity date are listed on the registration document).
The safety valve is designed to ensure the internal tank operating pressure does not exceed the maximum design value for any reason.

The installer is responsible for checking the valve (validity date, model and calibration) when installing the tank, and the owner or user is responsible for complying with instructions to change or calibrate the valve every two years.


The tanks have a fitting with a suction tube going to the bottom of the tank, with a valve fitted for collecting the gas in liquid form.

This valve must only be used by specialist personnel from the gas distribution company.
Interfering with this valve other than for normal plant operation is extremely dangerous and must be avoided.


The level gauge provides the percentage liquid amount in the tank at any given time. The gauge must be checked regularly to be aware of product stock levels. During replenishment the level gauge must be monitored by the driver from the gas distribution company, and must not exceed a maximum value of 80% for tanks above ground and 85% for underground tanks.

Users must only check levels and at no time interfere with the instrument, especially the locking screws.


An automatic dual shut-off valve is installed on a 1” ¼ NPT fitting on the tank to enable replenishment of the LPG.

The top of the valve has threading suitable for attaching a transfer device.

The bottom of the valve has a cut-off normally in a closed position.

During replenishment the pressure exerted by the transfer pump on the tanker opens this cut-off. On completion of filling operations the lack of thrust from the tanker causes the cut-off to return to its position, ensuring the valve is closed.

This valve must only be used by personnel performing replenishment operations.


There is a service valve on the lower generator of tanks designed for installation above ground which is only to be used by personnel from the gas distribution company.

Users must never interfere with this valve.