The bottom vent valve of the reduced-top gas tank is constantly leaking internally; what could be the cause and what type of valve should be used?
Thread Content
The drain valve at the bottom of the pressure-reducing gas tank keeps leaking internally. Gate valves made of carbon steel and stainless steel have been used, and they were replaced up to three times a year. The strong unpleasant odor emitted by the gas from this tank severely hinders normal inspection tasks. Is it the strong corrosiveness of reduced-distillate gas oil that causes internal leakage? How can this be avoided? What type of valve is suitable? I seek advice from colleagues in this field.
It’s better to use a gate valve with double valves.
Valve with a different lining – cheaper； If possible, you can switch to a special material.
Frequent opening and closing of valves for liquid drainage can easily lead to internal leaks due to corrosion (wet hydrogen sulfide), impurities accumulating in the valve grooves (in valves installed horizontally), and other reasons. If this occurs frequently, considering the use of a dual-valve system is advisable: the first valve should remain open at all times while the second valve is closed. Even if both valves have internal leaks, the risk of replacing only the second valve remains low.