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In a pumping station that i work, there is a magnetic sight glass attached to a surge tank which I guess there is something wrong about it because when I isolate the tube, drain it and reopen the air and water valve, the level doesn't rise! So can anybody tell me what is wrong with it?

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    $\begingroup$ blockage either side of the valves? $\endgroup$
    – Solar Mike
    Jun 3, 2021 at 10:20
  • $\begingroup$ either the tank is empty, the valve isn't really open, or there is a blockage. You test a sight glass by opening the drain. The level should drop then bounce back up when you close the drain. This is known as bouncing the glass. $\endgroup$
    – Tiger Guy
    Jun 4, 2021 at 7:35
  • $\begingroup$ I don't think there is a blockage because when i close the upper valve and open the lower one the level rockets to the upmost part and then when i open the lower valve it doesn't drop down! $\endgroup$
    – moeinSj
    Jun 5, 2021 at 8:18
  • $\begingroup$ the tank isn't empty because i can see water coming out of the lower valve and when i open the drain while the valves are open, water comes out without bouncing level! $\endgroup$
    – moeinSj
    Jun 5, 2021 at 8:21
  • $\begingroup$ Maybe the tube is gunked up and the magnet is sticking? Can you take it apart? $\endgroup$
    – Drew
    Jun 6, 2021 at 2:15

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