Answer / muhammad ismael

When the downstream flow requirement of a compressor will increase, the pressure will decrease here and pressure on suction will increase. This may effect back flow in compressor or a physical damage also. On that time flow control system try to change the speed of Drive (Motor & Turbine) to match the new requirement of flow but speed of a large mass (Driver + Compressor) is not possible to change with in a short period of time. so, to avoid from surge a control valve used from suction to discharge or a valve used to blow the high pressure.

Working principle of vibration sensor?, Type of vibration sensor? , Can we use vertical instead of horizental or vice versa?, if not Reasons?

2 Answers  

---

how ranges is decided for drum level or dearator level,in my pplant i have seen for boiler drum range is -1000 to 1000mmwc, while for dearator -2000 to 0 mmwc ,why they decided to take this range ?

2 Answers  

---

Why do we have earthing cable in branch cable and shield in the same cable?

0 Answers   Process Control Technologies,

---

Explain about the leakage class of the control valves

0 Answers   CCIE,

---

applications of 1-5v and 4-20ma?

4 Answers  

---

A pressure differential gauge type of instrument has a manifold with 2 isolation valves (hp and lp),2 vents(1 each for hp and lp) and 1 equalizing valve. Determine the position of each valve(either fully closed or fully open) when troboulshooting to: 1. zero the transmitter. 2. determine if there is a block in the impulse line. 3. determine if the gauge is functioning properly. The process fluid is water.

1 Answers  

---

two common seiling liquid used in seal pots are:

1 Answers   Thermax,

---

what should be minimum length and size of impulse line for steam flow orifice and feed water orifice? asked by sanjay parihar

1 Answers   Birla,

---

What is seeback effect?

3 Answers  

---

can any one give me the cost price of yokogawa & rosemount transmitters

4 Answers  

---

Why do we use 24V DC supply in instrumentation? What are its merits and demerits??

1 Answers   JSW, MJPRU,

---

if change the pid in D value so what action.

2 Answers   Siemens,

---