Answer / carl_ellis

Integral orifice plate assemblies are either designed to install as part of the process piping with flange mounts for a manifold valve, or for direct mounting to the process heads of a DP transmitter so that no transmitter piping is required.  They're designed primarily for low flows.   

Although intended for direct mounting to a manifold valve or process heads, optional fittings are available for high temperature applications that move the transmitter away from the integral orifice assembly.   Presumably, fittings for dual transmitters could be fabricated as well.

Commercial orifice flange unions have a single tap on each flange.  It would be possible to tap a 2nd DP transmitter into the piping for those taps.   

Dual or even triple transmitters on a single flow element and set of taps are sometimes referred to as 'stacked' transmitters. There are commercial adapters for close coupling dual DPs with a special manifold valve from vendors like Century Valve.   This has a long history of useage to cover a wide flow range with multiple DP transmitters, each of has a relatively low or limited turndown.

An SIS safety calculation has to account for a single-point-of-failure with a single set of taps.

There's always the possibility of a corporate engineering policy discouraging or forbidding dual DP transmitters on a single flow element and set of taps.

Carl Ellis
Measure First

Why three wire is using with a RTD?

3 Answers   ABB, MAHINDRA,

---

How many mode are in ups?

2 Answers  

---

What is the working principal of Mass flow transmitter?

1 Answers  

---

why we are using analytical instrument in plant ?

1 Answers  

---

how to change 4 wire rtd transmitter into a 3 wire rtd transmitter? as our transmitter is working for 4 wire rtd, what should do for working on 3 wire rtd transmitter

1 Answers   HHJ,

---

What is the standard height for stancion supports?

4 Answers  

---

What is the relationship between the universal gravitational constant (G) and the acceleration due to gravity (g)?

3 Answers   APPSC,

---

What is the meaning of Feedback? How many types it is? Explain it?

2 Answers   Bharathi Cement,

---

What is the start up procedure of desalter

0 Answers   Reliance,

---

can you provide me full detail about instrumentation in ONGC??

0 Answers   BRML, ONGC,

---

Possible cause of IOP alarm in a DP transmitter: a: IOP-minimum b: IOP-Maximum

4 Answers  

---

What are the different type of instrument used in cement industry with uses

2 Answers   Lafarge,

---