Explanation of terms related to startup and shutdown operations

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General terms for start-up and shutdown procedures (examples)
Serial Number | Term Explanation
1 | Drain valve: Valve used for draining from the top of equipment and pipelines, as well as for discharging liquid from the bottom of equipment.
2 | Trap valve: Valve used for discharging liquid from the bottom of pipelines.
3 | Open… valve: The degree to which the valve is opened depends on specific circumstances.
4 | Close slightly… valve: The extent to which the valve is closed depends on specific circumstances.
5 | Slightly open… valve: A small amount of fluid passes through the valve.
6 | Close… valve: Shut the valve completely.
7 | Fully open… valve: Open the valve to its maximum extent.
8 | Request power supply: Used to issue a request to supply power; the team leader is responsible for notifying the electrician to do so.
9 | Request removal (installation) of… blind flange: Used for removing or installing blind flanges; the team leader is responsible for this task.
10 | Assist in removal (installation) of… blind flange: Helps with the removal or installation of blind flanges; carried out by field operators.
11 | Confirm that the pump is ready for operation: Ensure all preparations are in place before starting the pump (excluding power supply); this includes filling the pump with oil, activating cooling water and flushing oil, priming the pump, rotating the pump shaft, and activating pressure gauges.
12 | Adjust the… purging process (during shutdown): Make sure the modified process is unobstructed; close branch lines, open auxiliary valves for equipment and control valves, open the inlet valve of the heat exchanger, close valves downstream of the control valves, manually close the control valves, close the pump’s inlet and outlet valves, open bypass valves, and close drainage valves along the pipeline.
13 | Adjust the… flow process (during startup): Ensure the modified process is unobstructed; close branch lines, open auxiliary valves for equipment and control valves, open upstream valves and drainage valves, close downstream valves, manually close the control valves, close the pump’s outlet valve, open bypass valves, and open drainage valves along the pipeline.
14 | Restore… process flow (during shutdown): Make sure the modified process is unobstructed; close branch lines, activate equipment (heat exchangers, pumps) and control valves along the pipeline, close auxiliary valves, and close drainage valves along the pipeline.
15 | Restore… process flow (during startup): Make sure the modified process is unobstructed; close branch lines, activate equipment along the pipeline, close the pump’s outlet valve, close drainage valves along the pipeline, manually close the control valves, open upstream and downstream valves, and close auxiliary valves. 16 Operate the control valves (LV, TV, PV, FV) to close the branch line valves and drain valves, open the upstream and downstream valves, and manually close the control valves; this is an operation to be carried out by operators on site. 17 Put the pressure gauge into use. 18 Purge the level gauge and purge the upstream and downstream connection valves as well as the upstream and downstream drain valves respectively, then put the level gauge into use. 19 Adjust…; OP=… Manually adjust the OP value of the control circuit (do not use terms such as “adjust” or “manual control”). 20 …Switch to automatic mode; SP= Set the automatic value, i.e., the desired set point. 21 Start up the rotating equipment. 22 Open them one by one…; use the pipelines and equipment connected in parallel to conduct individual tests for functionality. 23 Check for leakage points and address them during the leak-testing process. 24 LV, PV, FV, TV refer to level, pressure, flow rate, and temperature respectively; field control valve assemblies. 25 Receive materials from outside the device. 26 Send materials out of the device. 27 Introduce N2 or steam, etc., into the process or container. 28 Adjust parameters such as temperature, burner settings, and turbine speed to achieve the desired outcome. 29 Evacuate the container or pipeline so that no relevant medium remains inside it. 30 Establish a circulation or set a liquid level so that there is flow in the process, with the medium being introduced into the container until the liquid level can be seen. 31 Replace the original medium with another one. 32 Conduct a closed-loop circulation by introducing the medium into one or more process pipelines. 33 Control valves cannot be referred to as “regulation valves”. 34 Liquid hydrocarbons cannot be called “liquefied gas”. 35 Acidic water cannot be referred to as “sewage”. -20- 36 Valves cannot be called “manual valves”. 37 N2 stands for nitrogen; it cannot be expressed in words. 38 O2 stands for oxygen; it cannot be expressed in words. 39 H2 stands for hydrogen; it cannot be expressed in words