How do you determine the diameter of an orifice plate?
Orifice plate types It is made up of SS and its thickness varies from 3.175 to 12.70 mm. The plate thickness at the orifice edge should not be exceeded by any of the following parameters: 1 – D/50 where, D = The pipe inside diameter. 2 – d/8 where, d = orifice bore diameter.
How do you calculate orifice size?
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.
Which diameter is less orifice or pipe?
An orifice plate has an opening that is smaller than the pipe diameter. The typical orifice plate has a concentric, sharp-edged opening. Because of the smaller area, the fluid velocity increases to cause a corresponding decrease in pressure.
How many pipe diameters equivalent distance of straight pipe must be installed after the flowmeter?
You should always attempt to install a section of straight pipe equivalent to 5 times the bore diameter to the upstream side of the flow meter.
What is the diameter of orifice?
It consists of flat circular plate which has a circular hole, in concentric with the pipe. This is called orifice. The diameter of orifice is generally 0.5 times the diameter of the pipe (D), although it may vary from 0.4 to 0.8 times the pipe diameter.
What are the types of orifice?
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 is the diameter ratio size used to determine the upstream and downstream straight pipe requirements?
Elbows, reducers, etc upstream of the sensor will distort the flow profile and so adequate straight runs need to be accounted for. Typical recommendations suggest 35 straight pipe diameters upstream and 5 straight pipe diameters downstream.
How does an orifice plate flow meter work?
Orifice plates are a primary flow element, detecting the flow of a fluid passing through the plate by sensing the pressure drop across the plate. When a fluid flows through a restriction in a pipe, it creates a pressure difference between upstream and downstream of the restriction.
What is the relationship between orifice diameter and pipe diameter?
| Q. | What is the relationship between Orificemeter diameter and pipe diameter |
|---|---|
| B. | orificemeter diameter is one third times the pipe diameter |
| C. | orificemeter diameter is one fourth times the pipe diameter |
| D. | orificemeter diameter is equal to the pipe diameter |
| Answer» c. orificemeter diameter is one fourth times the pipe diameter |
How big of an orifice plate do you need?
A β of 0.84 raises the requirement to 40+ diameters for all types of installations. What this all means is that if your plant needs maximum accuracy, use lots of pipe run upstream of orifice plates. In some cases, 90 diameters are necessary. Additionally, if you’re having flow meter problems, check the installation.
How do you install an orifice plate in a pipeline?
ORIFICE PLATE INSTALLATION INSTRUCTIONS 1. Make certain the pipeline is not under pressure and has been properly drained or purged as required. 2. Loosen all Studs 3. Remove the studs in one half of the flange union. 4. Spread flange union by turning jackscrews clockwise. 5. Install new plate or removed existing replacement or inspection.
How to install an orifice plate for liquid metering?
General Installation requirements: 1 The orifice meter must be installed between two mating flanges in the pipe. 2 For liquid metering, the pipe should run full at the measuring section. 3 The diameter of the tube must be circular over the measured length.
What are the requirements for an orifice flowmeter?
Pipeline requirements for orifice flowmeter installation: (1) When installing the orifice flowmeter, there should be a section of measuring pipe. At least keep the equal diameter straight pipe section of the first 10DN and the rear 5DN to improve the measurement accuracy.