Is the outlet valve of the central drain pipe in the closed position? Normally open?
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Currently, there is much debate regarding the outlet valve of the central drainage pipe; some believe it should be kept open, while others think it should be kept closed What on earth is it like? If it is normally open, what are the domestic and international standards and specifications? If it is to be kept closed at all times, what are the domestic and international standards and specifications? Thank you
From a usage perspective, it should be kept open at all times to prevent excessive water accumulation on the storage tank’s floating structure
Reply to 2# bluemoonsunny: But are there any clear standards or regulations specifying what is meant by \"always open\"?
You should be using a pneumatic valve of the single-acting type. Single-acting valves are further divided into normally open and normally closed types; the specific type to choose depends on the requirements of the application. In your case, a normally open valve would be appropriate. A normally open valve means that in the event of a failure in the air supply, the spring pushes the valve back to the open position, while a normally closed valve returns it to the closed position. The choice between these two types depends entirely on the needs of the application, as there are no standard regulations regarding this
Reply 4# LAPAR Xiao Mao: I searched for a long time but couldn’t find any specific standard regulations; sigh
The valves of the central drainage pipes should generally remain open, but leaks in the drainage pipes may cause the medium to leak out； If it remains closed regularly, operators must be arranged to open the valve on rainy days to prevent water from accumulating on the floating roof and causing serious accidents ； Personal opinions should be shared regularly; inspections should be intensified as appropriate to check for any medium leaks.
Reply to 6# brucesh: Is there any clear standard specified for this? Thank you
Reply to 7# juncaide: There seems to be no standard for this; it’s just a matter of operational experience