【Q&A Question 100】April 10, 2018
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【Q&A Question 100】April 10, 2018: Briefly describe how to operate the system by switching to an alternate line when there is a fault with the control valve (1) Refer to the indication on the on-site primary gauge or communicate with the operator inside using a walkie-talkie; first close the upstream valve slightly until there is a change in the indication. At this point, the maximum flow rate of the control valve is already regulated by the upstream valve. (2) Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. (3) Close the downstream valve, open the drain for pressure relief, and contact the instrument technician for handling. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The validity period for this question is 48 hours; within those 48 hours, 10 wealth points are awarded for correct answers and 2 wealth points for incorrect answers ； If the response is given after 48 hours, the score is halved, regardless of whether it is correct or not ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to the link below: https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space – specifically the registration-themed section and the voting thread for the “My Registration Season” event: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1954223. The APP short-video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
1. Slowly close the main line manual valve of the control valve until signs of reduced flow appear, then stop； 2. Slowly open the bypass manual valve; once the flow rate starts to increase, simultaneously reduce the flow of the main line manual valve to maintain a stable flow rate ； 3. Repeat this process until all the valves on the main line are fully closed.
Answer: ① Refer to the indication on the on-site primary gauge or communicate with the operator inside using a walkie-talkie; first close the upstream valve slightly until there is a change in the indication, at which point the maximum flow rate of the control valve is already regulated by the upstream valve. ②Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. ③Close the downstream valve, open the drain to relieve pressure, and contact the instrumentation technician for handling.
(1) Refer to the indication on the on-site primary gauge or communicate with the operator via walkie-talkie; first close the upstream valve slightly until there is a change in the indication, at which point adjust the maximum value of the control valve
Following the indication of the primary gauge at the site, first close the upstream valve slightly until there is a change in the reading on the primary gauge; at this point, the maximum flow rate of the control valve is already being controlled by the upstream valve. One person slowly opens the bypass valve, while another slowly closes the upstream valve; it is preferable for the gauge reading to remain stable, until the upstream valve is completely closed at which point the bypass valve is used for control.
①Refer to the indications on the on-site gauge or communicate with the operator via walkie-talkie; first close the upstream valve slightly until there is a change in the indications. At this point, the maximum flow rate of the control valve is already regulated by the upstream valve. ②Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. ③Close the downstream valve, open the drain to relieve pressure, and contact the instrumentation technician for handling.
(1) Refer to the indication on the on-site primary gauge or communicate with the operator inside using a walkie-talkie; first close the upstream valve slightly until there is a change in the indication. At this point, the maximum flow rate of the control valve is already regulated by the upstream valve. (2) Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. (3) Close the downstream valve, open the drain for pressure relief, and contact the instrument technician for handling.
Answer: ① Refer to the indication on the on-site primary gauge or communicate with the operator inside using a walkie-talkie; first close the upstream valve slightly until there is a change in the indication, at which point the maximum flow rate of the control valve is already regulated by the upstream valve. ②Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. ③Close the downstream valve, open the drain to relieve pressure, and contact the instrumentation technician for handling.
Following the indication of the primary gauge at the site, first close the upstream valve slightly until there is a change in the reading on the primary gauge; at this point, the maximum flow rate of the control valve is already being controlled by the upstream valve.
(1) Refer to the indication on the on-site primary gauge or communicate with the operator inside using a walkie-talkie; first close the upstream valve slightly until there is a change in the indication. At this point, the maximum flow rate of the control valve is already regulated by the upstream valve. (2) Slowly open the bypass valve while slowly closing the upstream valve; it is advisable to ensure no fluctuations, until the upstream valve is completely closed, at which point control is carried out using the bypass valve. (3) Close the downstream valve, open the drain for pressure relief, and contact the instrument technician for handling.
Following the indication of the primary gauge at the site, first close the upstream valve slightly until there is a change in the reading on the primary gauge; at this point, the maximum flow rate of the control valve is already being controlled by the upstream valve.