Answer Posted / k.sreenivasan

To begin with you must ask why there was a DP measurement
in the first place?
For example if you are measuring the DP across a Filter to
find filter choked condition, then removing one capillary
will defeat the basic concept.
If the DP xmr is used for a level measurement, then also
you will get wrong reading.
So unless you inform the details... correct answer cannot
be given.
By keeping one side of the transmitter open to atmosphere
by removing one capillary, the other side will read the
pressure with reference to atmosphere.
If you want vacumm pressure measurement then you have to
keep the HP side open and LP to the process. Vice versa for
gauge pressure measurement.

hiii.... can any one provide me previous years question paper of hindustan petroleum for instrumentation engineering???

1986

---

Explain the working of rota meter.

1220

---

how u calibrate pneumatic n motorized c/v?

1969

---

What is Droop? What is Step/Gradient Limiter in Turbine Governor control?

3402

---

how to calibrate steam control valve in steam turbine

3329

---

There are many type of control cable like pair,core,tried, What are defination each one

2154

---

Which type of pressure can be measured by these elements?

1138

---

how does we calibrate a square root flow transmitter ,give an example and explain it step by step like range calculation , calibration hook up series connection , zero check , and how to apply pressure , and if not geting proportional output then what should we do ?

5672

---

In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.

2360

---

what diffrence b/w plc s7200,300,400

2070

---

Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

2211

---

which type inter lock use in petrochemical refinery,and oil & gas?

3025

---

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 ( from HIS) >Ensure both devices firewalls are disabled. >The antivirus installed on the STN is disabled. >Ensuring both devices are within the same workgroup. >Added both devices to each other's Host and LMHost files. >Running IT Security tool after changing any administrative settings.

2194

---

What is cut off relay? And why use in PLC and DCS?

1373

---

What you mean by multi stage control vavles?

1811

---