Weekly Topic 10: Commissioning of Field Instrumentation (7.4~7.10)
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This post was last edited by A scholar adrift in the sea of knowledge on 2011-12-12 at 14:38 – the most common issues with instruments. Similar issues must have been discussed in the dashboard area, with many **valuable insights. Here, I mainly want to encourage everyone to use English to summarize together the knowledge points they know. Please feel free to speak; talk on whatever topic you know about. There’s no need to worry about grammatical structure – the important thing is the content. Everyone is encouraged to find good posts and opinions in the dashboard, and to reply here in English. Commissioning of Field Instrumentation: We have various field instruments in our plant, such as pressure, temperature, and level switches/transmitters, which have been installed but not yet tested or commissioned. Could someone provide a list of the key items that should be checked during the testing and commissioning of these instruments? This will help us create a checklist specific to each type of instrument in our plant. Weekly topic: Note: 1. There is no need to hide your replies – hiding them will result in no points being awarded ； 2. Please do not post spam or meaningless posts ； 3. Maximum score: 2 Charm ； 4. We welcome all marine enthusiasts to offer valuable suggestions; you can send direct messages to the moderators or post comments under this thread ； 5. Foreign language section is seeking active moderators and technical discussants: http://bbs.hcbbs.com/viewthread.php?tid=825922&page=1&extra=#pid5441402. Everyone is welcome to sign up actively! Thank you for your participation; wish everyone a pleasant work week ahead
This post was last edited by jeffreytang77 on 2011-7-4 22:04. I’ll start by listing any two items to give everyone a starting point. As with the Commissioning of field instrumentation, it generally includes the following two items: #Calibration and testing of instruments prior to installation #Loop testing. In fact, the answer is quite simple. Please feel free to add more; share as many as you know. There is no need to explain exactly how to carry out each task; simply indicating which tasks need to be completed will earn you points.
Be sure to properly protect your sensing element when purging the piping.
Commissioning of field instrumentation @ role division (DCS/Site) @ loop test (DCS/Site) @ test result signing @ document filing @ Final acceptance
FUNCTION test FIELD INSTRUMENT INSTALLATION INSPECTION LOOP INSTUMENT CABLE JUCTION BOX INSTUMENT CABLE calibration
I’m not sure whether ICP is one of the field instruments, but it’s the instrument I’m familiar with. ICP stands for Inductively coupled plasma (an instrument used for spectroscopic analysis). Install the ICP device; check the argon gas supply as well as the ventilation system. Prepare standard solutions and deionized water for calibration purposes. Run the instrument to carry out the calibration.
I’m a bit confused about this topic. If you’re referring to the period after the field instrument has been installed but before it’s put into operation, what should we do to test the instrument? First, you need to verify that the instrument’s label and model are correct. Next, check whether the installation and connections are proper. Then, assess the operating space to ensure that the instrument can be easily viewed and operated. For transmitters and control valves, you should carry out the following steps: 1) check the cables and terminals, 2) supply power and test/calibrate the instrument, 3) ensure that the signals and circuits are correct, 4) confirm that the valve can operate in response to the signals
- Conduct factory acceptance testing for the DCS. – According to the diagrams, inspect the cables and terminals, including junction boxes, control boxes, and cabinets, etc. – Ensure that the grounding system is proper. – Supply power to the DCS and field instruments in order to calibrate each instrument. – Check the loops in the DCS to ensure that the valves operate correctly.
This post was last edited by purplelarry on 2011-7-9 08:16: Verify whether the explosion proof category and grade of instruments are appropriate for the designated area, and ensure that there is a safety barrier (such as an isolation barrier or Zenner barrier) between the intrinsically safe area and the non-intrinsically safe area.;P
Reply to 1# shiwang528: I listed my own checklist as a conclusion for this forum post. In fact, when I looked at this issue again, I realized that strictly speaking, these items should belong to the Ready for Commissioning phase. • Calibration and testing of instruments prior to installation. • Visual inspection for complete and correct installation. • Insulation and continuity testing of cables. • Cleaning, flushing, pressure and leak testing of pneumatic and hydraulic tubing. • Adjustment of control, alarm and shutdown settings. • Loop testing. • Function testing of control systems. • Function testing of field instruments. • Hot oil flushing of instrument tubing. • Area completion. • Preservation.