What are the different types of orifice meter?
By John Johnson
What are the different types of orifice meter?
Types of Orifice Plates
- Square Edge (Standard) Bore. For the common square edge concentric bore orifice, the bore and bevel is the standard method of limiting the plate edge thickness.
- Quadrant Edge Bore. The quadrant edge bore is an orifice with the inlet edge rounded.
- Eccentric Bore.
- Segmental Bore.
- General Description.
What are orifice plates used for?
An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate ).
What is orifice and its types?
Orifice is defined as the small opening on side or bottom of a tank through which any kind of fluid is flowing. The opening can be of circular, triangular or rectangular in cross section and they are named on the basis of shape accordingly. Orifices are mainly used for measuring the rate of fluid flow.
What is eccentric orifice plate?
Eccentric orifice plate is similar to a centric orifice plate with circular opening. Its bore position is offset from the centre line of the pipe. Ideal placement of differential pressure tapping is vertical in upward part of the orifice plate, differential pressure tapping are individual. …
What is orifice type?
Concentric Bore – The most common orifice plate is the square-edged, concentric bored design. This type of orifice plate has a very high accuracy. Concentric Bore Orifice Plates. Eccentric Bore – Eccentric bore orifice plates are plates with the orifice off-center, or eccentric, as opposed to concentric.
How do I choose an orifice?
Divide the flow of the liquid by the velocity of the liquid to determine the area of the orifice in square feet. In the above example, you would divide 8 by 2. The total area of the orifice would be 4 square feet.
What is orifice plate sizing?
Beta Ratio As discussed in flow instrumentation principles the beta ratio (β = d/D) is the ratio of the orifice plate bore diameter (d) and the pipe internal diameter (D). During sizing, keep your beta ratio in the range 0.3 to 0.7. This is the range of beta ratio that gives the best performance from the orifice plate.
Why are orifice plates beveled?
The purpose of having a square edge on the hole in an orifice plate is to minimize contact with the fast-moving moving fluid stream going through the hole. Ideally, this edge will be knife-sharp. Beveled orifice plates are obviously uni-directional, and must be installed with the paddle text facing upstream.
What is upstream and downstream in orifice plate?
For most piping systems it is 20 pipe diameters upstream and 5 Downstream for an orifice plate. (Vena-Contracta Taps are located 1 pipe diameter upstream of orifice plate and at the point of minimum pressure downstream, this point is called the vena-contracta. This point varies with Beta ratio.)
What does a square-edged orifice plate look like?
Looking at a side view of a square-edged concentric orifice plate reveals sharp edges (90 o corners) at the hole: Square-edged orifice plates may be installed in either direction, since the orifice plate “appears” exactly the same from either direction of fluid approach.
What are ororifice plates?
Orifice plates are most commonly used primary elements for flow measurement in pipelines based on the principle of measurement of ‘differential pressure’ created when an obstruction is placed in the fluid flow, due to increase in fluid velocity.
What type of orifice plate is used for liquids?
Eccentric are used for liquids that contain gases or solids. Conical orifice plates are installed backwards so that the flow enters the beveled side, where normally the flow enters the non-beveled side. Integral orifice plates are another type of orifice plate used for low flow rates.
What are the different methods of electrical earthing?
Methods and Types of Electrical Earthing. 1 Plate Earthing: In plate earthing system, a plate made up of either copper with dimensions 60cm x 60cm x 3.18mm (i.e. 2ft x 2ft x 1/8 in) or 2 Pipe Earthing: 3 Rod Earthing. 4 Earthing through the Waterman. 5 Strip or Wire Earthing:
