For pipes shared by steam and circulating water, how to eliminate air hammer?
Thread Content
We designed it this way initially: for the same pipeline, steam is passed through it for a period of time, followed by circulating water; air hammer often occurs in the pipeline behind the return water check valve. Is the air hammer caused by steam and circulating water sharing the same pipeline, or is there some other reason? How to eliminate it effectively?
Never heard of a pneumatic hammer. However, in our company, the circulating water system stops by closing the outlet pipeline first, and then the pump is turned off, so there is no water hammer
Water hammer, also known as hydraulic shock, occurs when pressurized gas in a pipe comes into contact with liquid; this results in unusual noises emanating from the pipe, along with vibrations in the pipe. Steam pipes are equipped with steam traps at regular intervals along their length; these traps are used to discharge the liquefied steam within the pipes, thereby preventing water hammer effects that can occur when there is an excessive amount of water accumulated. Since the pipeline alternates between carrying circulating water and steam, it would be better to install a steam trap at the lowest point of the pipeline, along with a gate valve in front of it. The gate valve should be closed when water is flowing through the pipeline, and opened when steam is flowing so that water can be drained; once there is no water in the pipeline, water hammer will not occur. Just my own thoughts.
An electric gate valve is installed in front of the check valve; a low-position electric drain valve is placed between the electric gate valve and the check valve. After the water supply is stopped, the electric gate valve is closed while the electric drain valve is opened, and it remains open.
Water hammer is generated when steam is switched off and circulating water is introduced.