Answer / carl_ellis

An orifice plate (OP) creates a pressure drop in the flow
stream.

The question is whether an orifice plate 'works'. Works how?

An orifice plate will always 'work' by creating a pressure
drop; the proper questions are whether the permanent
pressure loss is excessive, whether the orifice plate has
been 'sized' for a specific medium at correct design
conditions, and whether the pressure drop (DP) is adequate
for instrumentation that senses the DP.

Orifice plates typically drop 100 inches water column at
100% flow rate, about 25 times the DP of 100mm water column.
A DP of 100mm water column at 100% flow rate is more
typical of an averaging pitot tube than an orifice plate. A
full scale flow rate of 100mm w.c. requires a low range
pressure transmitter, or one with a high turndown ratio.

A 0.3 Beta is acceptable.

Carl Ellis
Measure First

how to convert bar to mA?

1 Answers  

---

i want to control the temp of sand(welding flux) between the range of 150deg C to 170deg C. sugges me sum temp control method without PID controller.

1 Answers  

---

Hello-I know this not an engineering question,I am working in gulf & i want to do correspondence diploma in instrumentation,can any one give me the address of any university in which this courses are available.

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  

---

How to work & calculated output of the Derivative action in pid controller (Explain Derivative controller)

0 Answers  

---

What are different types of cable?

0 Answers  

---

Manipulation of dead wt. tester double piston type.

0 Answers   CCIE,

---

How we can re-range the DP transmitter, range is -0.5 to 2.0bara. new range is -0.5 to 5 bar

2 Answers   Rosemount,

---

What are the Components of Siemens S7 300 Series PLC system ?

1 Answers   Siemens,

---

how to define the P,I,D value in tuning pid loops in online.

1 Answers   Thermax,

---

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 can we calibrate the differential pressure transmitter by using HART communicator

8 Answers   Hindalco,

---