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Recent content by leomiranda

  1. leomiranda

    Junction Box Certification

    I always heard that it’s not recommended to drill one junction Box on site due the lost of the certification. Ok! But there are junction boxes for classified area that are provided with removable gland plates, enabling on-site drilling. On this case how the certification works? Where (standard)...
  2. leomiranda

    Control Panel only x Control Panel + Remote I/O

    Generally in the projects of my company we provide just one Control Panel to control our skid, all instruments signals (AI, DI) go directly to this CP (Control Panel) and our PLC communicates with the OIL Rig master PLC. But in one client standard I saw this information that we must follow...
  3. leomiranda

    Pressure Indicator instalation

    According standards, to install a pressure transmitter, if liquid, the process connection shall be from middle to bottom, if gas, from middle to top. But when the instrument used is one PI (Pressure Indicator) I always see on top (90 degree) for liquid or gas. For PI, don’t I need to follow this...
  4. leomiranda

    Tubing material for seawater

    The tubing will be in a marine environment (offshore unit), but my instruments will be in contact (the tubing) with salt water. One pump collect water direct to the ocean and my unit is responsible to remove the sulphate of the water. So several instruments (PDIT, PIT) will have salt water...
  5. leomiranda

    Best practice to wire an instrument properly and safely

    Hi! Never connect the shield at both ends! Leave the shield in the instrument side isolated (not connected), and connect the other side of the shield in a ground bar, probably located in one panel. More details here (in Portuguese, but you can use one web translator)...
  6. leomiranda

    Tubing material for seawater

    When I have to specify Pneumatic transmission lines for instruments generally I use as material ASTM A 269 GR.TP 316. But now I have one project in my hands where my instruments (i.e. PDIT) will work with seawater. My process team is concerned in using this material due the possibility of...
  7. leomiranda

    Contorl panel x distance

    itsmoked, it was my mistake! I discovered that I create this topic in a wrong Forum, so I did the same question in another forum, but I forgot to delete this one. But thank you for all answers!!!
  8. leomiranda

    Control Panel x Distance

    Considering the instrument cable 1.0 and 1.5mm2 core area, 24 VDC, digital and 4-20mA signals.
  9. leomiranda

    Control Panel x Distance

    I have one big skid (in one oil rig) with a lot of instruments (level and pressure transmitters, control valves, on-off valves, etc). I was planning to install one control panel in this skid and rout all instrument cables to this panel, and use optical fiber to connect this remote panel with the...
  10. leomiranda

    Contorl panel x distance

    I have one big skid (in one oil rig) with a lot of instruments (level and pressure transmitters, control valves, on-off valves, etc). I was planning to install one control panel in this skid and rout all instrument cables to this panel, and use optical fiber to connect this remote panel with the...
  11. leomiranda

    Soft Tag - What is it?

    Yes, I have ISA 5.1
  12. leomiranda

    Soft Tag - What is it?

    Thank you!!!!
  13. leomiranda

    Soft Tag - What is it?

    I have one P&ID that shows two pumps. I have one PIT installed in the admission and another PIT in the discharge of the both pumps. Each PIT send their signal to one virtual FI (there is one note saying that this FI is one SOFT TAG) and this FI is sum with the other FI of the other pump and the...
  14. leomiranda

    LZIT what is it?

    The guy responsible for the execution of the P&ID told me this is used to indicate that the signal will be used in shutdown. If is one LZIT, it means that the signals generated (LSLL and LSHH, for example) must be used to generate shutdown. This is new to me.
  15. leomiranda

    LZIT what is it?

    I have one P&ID in my hands and there is one vessel with one instrument that has the Tag LZIT. I don’t know what the “Z” means! I know LI, LIT, LG, but LZIT…. I don’t know what this level instrument does exactly. Can somebody help me?
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