I saw one P&ID 6" control valve has been connected with 8"
process line, and 2" valve also connected in parallel with
6" valve. why the 2" valve connected in parallel, Is there
any technical reason. please clarify. With Regards-Kittu
Answer Posted / divyang
There can be many reasons to provide two CV-
1. Case where flow controllability is extremly important.
Hence to get better control at lower load 2" CV will be
operated & once plant reaches cerain load higher size
control valve comes into picture.
2. Higher size CV is kept on certain value of manual
opening, and fine control is done by smaller valve. eg if
flow requried is 10000 kg/hr and controlling limits are +/-
200 kg, smaller CV will give fine control.
3. During revamp of the plant capacity instead of
increasing the existing CV, if a samller size CV is
available in spare same can be installed in parallel
Is This Answer Correct ? | 5 Yes | 0 No |
Post New Answer View All Answers
How can i copy program (parameter) from mm440 (V.F.D.) by using BOP?
What is the Working principle of Dozing valve?
Regarding , there is an air cooler which control the fans(50% of AV FANS) by temperature in outlet , and the louver of Air cooler is controlled by HIC from control system , So if on Air cooler we will consider 2 individual I/P converter or positioner?
I wnat to practice more online type questions .so will you show them me to take a practice test?
Which topics are covered in Process Control?
Explain the working principle of lvdt?
How many ohms are required for proper earthing?
Why rdt and thermocouple both give different output .and one things more, how to generate ohm or mili volt plz mail me merajalam143545@yahoo.com
Yokogawa CENTUMVP R6.09 unable to download to Engineering Station with ExaOPC R3.75
The issue is when I try to download the common project section to the Engineering Station (STN) from the HIS in System View, it is unable to connect. The error displayed is:
WARNING: Could not connect to equalize destination. (7001)
Retrying. Number of retries = 0/1
ERROR: LdXopsLoadMain: connect error 10060
ERROR: Processing terminated due to connection error. (7002)
Equalization end with errors. STN0149
---- ERROR = 2 WARNING = 1 ----
Background:
>Updated the ExaOPC software on the STN from 3.60 to 3.75
>STN operating system is Windows Server 2008 R2
>HIS operating system is Windows Server 2016 Stanard
Solutions attempted include:
>Ensuring all IP addresses are correct and all networked devices can be pinged.
>The ability to ping a device using its host name from another device (
what is orfics working in main steam line. is it increase pressure, velocity of steam flow and dicrease steam flow rate. or any other
what is the input to be given in digital flow meter during the the calibration time?
why micro controller 8051/52's clock frequency is internally divide by 12 ?? and why it is further divide by 32 in UART serial communication ??
What is zener diode? What is voltage regulator?
in which principle pressure tx,level tx ,flow tx,temp tx ,control valve works?
i have done DAE in Instrumentation and Process Control. i have applied for an apprentice training in chemical company after three day my interview will be conduct but i need more information about industrial process control and controller. my e mail is imran_dilsetu@yahoo.com please tell me interview question relative to instrumentation ?