Should low-voltage equipment be equipped with overvoltage protection devices?
Thread Content
This post was last edited by gaoabi on 2018-3-26 at 15:18. I have a question and would like to ask the experts here: It’s a low-pressure device (not a vessel), with an operating pressure of 30 KPAG and a design pressure of 50 KPAG. For a coke oven gas desulfurization tower, the gas enters from the gas holder at the front, but there are shut-off valves at both the front and back of the tower. Is it necessary to install an overpressure protection device in this case? If we do, what operating conditions should be considered? PS: Without a flare system, the only option for venting is to use pressure relief valves; is it okay to release gas (H2, CO, CH4, C2H6, etc.) directly into the atmosphere?
As shown in Figure 1 of HGT-20570.2-1995, a safety valve needs to be installed. It is recommended to consider discharge in the event of a fire accident; if there is no flare system, the safety valve must discharge to a safe high point, with a flame arrester or water seal installed at the discharge end