Interested to Buy Any Domain ? << Click Here >> for more details...
for commissioning the DPT and Flow Transmitter , what kind
of necessary activities we have to check and do?
specially that orifice flange valve[ isolation valve}
- 1 Answers
- 8806 Views
- L&T, I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
Here's Mr. Emerson's view on loop checking with instructions
for zero checking a DP transmitter on a 3 valve manifold:
Wiring Checkout and Loop Check
The first step in commissioning a new instrument is the
physical installation. The physical installation steps are
the same for both the traditional and new approach:
1. Review P&ID drawings for location and piping instructions.
2. Review device instructions for proper location, mounting,
and piping.
3. Verify field device is physically located in the correct
location per the P&ID. Verify that a permanent tag label is
securely attached to the device that clearly indicates the
assigned loop tag number.
4. Verify field device is correctly connected by performing
the following inspections:
a. Physical inspection- properly mounted and oriented as
designed, ensure close-coupled connections are securely
fastened; pipe stands are structurally sound
b1. Mechanical - Sensing lines, and other process
connections are properly installed, connected and verified
per instrument design specification
b2. For DP transmitters with manifold valves:
- Always perform a zero trim on the transmitter/manifold
assembly after installation to eliminate
any shift due to mounting effects.
- In normal operation the two block valves between the
process and instrument ports will be open and the equalizing
valve will be closed.
- To zero the DP transmitter (3 valve manifold), close
the block valve to the low pressure (downstream) side of the
transmitter first.
- Open the center (equalize) valve to equalize the
pressure on both sides of the transmitter. The manifold
valves are now in the proper configuration for zeroing the
transmitter.
- After zeroing the transmitter, close the equalizing valve.
- Open the block valve on the low pressure side of the
transmitter to return the transmitter to service.
c. Electrical - Conduit runs are properly connected; seal
drains are installed correctly, etc.
5. Verify the input or output signal is within the device's
normal operating range.
6. Verify that any special/custom device characteristics
required are present (example: custom gas curves, special
construction materials, etc.)
7. Measure and adjust associated air and electrical power
supplies.
8. Measure loop impedance by disconnecting the signal wiring
at both the transmitter and rack room ends, shorting the
signal wiring at the transmitter and measuring the loop
resistance with an ohmmeter at the termination panel end.
This process typically takes two technicians with two-way
radios for communication.
9. With an ohmmeter, verify there are no shorts to ground in
the signal wiring by checking the wiring to ground while the
wiring is still disconnected. This process typically takes
two technicians with two-way radios for communication.
10. Verify proper wiring polarity.
11. Connect the wiring to the transmitter in the field and
in the rack room.
12. Verify that all field wiring is properly labeled per the
instrument loop diagram. This includes
all terminations per the instrument loop diagram.
13. Verification that all instrumentation wiring is
mechanically sound by performing a physical "Tug Test" of
the wires.
14. Verify that the field device enclosure is closed, all
temporary shipping stops removed, and the device is
mechanically fit for service as defined above and in the
device instruction manual.
15. Apply power to device.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
What is heating effect?
What inherent design and operating principles are included in a modern control system to use predictive maintenance practices to increase overall system reliability?
diff between neutral ,ground,phase , earthing and shielding?
IS there any effect of vortex in low pressure side of the transmiter after the orific in feed water line? if yes then what is the calculation?
how the arrangement of equipments done in control room
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
Any body have know try work calculation ???
I am using 971 Enraf radar level transmitter for LPG tanks ,the tank side indicator gives the error code 999999999FL can any body give me any diagnostic for this issue?
Why thermo wells are used? What materials are used in thermo wells?
can anyone can let me know in Eurotron Micro cal 2+ calibrator in milli amps source mode we are not able to get 20 milli amps output it only produces 1.52 milli amps out, but display shows increase in milli amps , and err6 displays, let me know how to remove the err 6.
wich is coming the first HAZOP OR SIL
give me the formula for analog to digital converter and also d to a converter
Operational amplifiers
what is the procedure of belt scale calibration?
WHAT ARE THE INSTRUMENTAL DIAGRAMSOF VALVES?
