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
- 8948 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
How would you choose differential range?
why we r opening HOT BYPASS valve during startup of a compressor?
How u measure the massflow in orifice flow measurement techniques
Why grounding is necessary? Give example with diagram.
why we use 3 wire rtd direct wiring for temperature measurement instead of temperature transmitter like bearing temperature
What is the right procedure for adjusting the gap voltage of bently nevada vibration sensor?
can anyone tel the syllabus or previous year question paper for BHAVINI(EIE)2014.
my data card only does run in my mobile so how can change it that it run other mobile & computer and i can stor data in my data card
How to convert mmWc(mili meter water colam) to tph(ton per hour)?
what is gas metering system? gas chromatograph? and gas compressors?
Can please tell mi about SIOS, PRM, SERVER, and what is the diference between PIN LAN, PCS LAN,APC Server, and please send the Doc if possible for referance,mail id patil_amit17@yahoo.com
what is IEC code in cables & how to selecting cables?
What is Span Error
how many maximum enter 2mm Dia solid cylindrical pipe into 8mm Dia hollow cylindrical pipe. give answer with calculation.
SOME OF YOUR QUESTIONS ARE NOT MAKING ANY SENSE SO TRY AND PUT IN A LITTLE BIT MORE EFFORT BEFORE YOU POST A QUESTION. WE WILL ONLY HELP THOSE WHO WE CAN SEE ARE TRYING TO HELP THEMSELVES.
