Safety devices for cryogenic liquefied gases

What are the safety devices intended for cryogenic liquefied gases?

Cryogenic intermediates refer to substances that are colder than -90°C. In principle, the safety devices for these intermediates are similar to other pressure devices, but extremely cold conditions impose their own special features on these safety devices.

What is needed for the protection of a storage tank containing cryogenic media?

Our German representative Protego has its own comprehensive product range for these safety devices. The devices, which Protego generally refers to as tank valves.

Tank valves

Illustration of safety devices for an ammonia storage tank.

In the picture, on both the left and right on top of the tank are pilot-operated over/under pressure valves VN-A-PCPF-NV. Pilot control prevents the valve from freezing.

Watch the operating principle of the valve in the video.

The over/under pressure valves on the right side of the tank are protected by a flame arrester (DA-SB).

On top of the tank, there is an emergency relief valve (V/SV), whose capacity is calculated for the scenario in which the tank would catch fire. At the bottom, the base safety valve (SI/DP) automatically closes the bottom valve if any damage occurs to the discharge line.

In addition, Protego manufactures internal safety valves for tanks. The PROTEGO SI/FI valve closes from inside the tank, so that no leakage occurs if the external shutdown mechanisms of the tank suffer damage. The valves can also be serviced, as only the mounting flange is welded to the tank. The external parts of the valve can be replaced without emptying the tank.

The design is slightly different depending on the liquefied gas (ammonia, ethylene, propylene, LNG) and additional information can be found in the PDF below.

We assist with the selection and sizing of safety devices according to the requirements of the application.