Diagnostic Life And Analytical Science
Orifice Fittings
Throughout the oil and gas industry, there stems the need for accurate, economical measurement of pro- cess fluids and natural gas. Orifice Meters sometimes referred to as Orifice Fittings satisfies most flow mea- surement applications and is the most common flow meter type in use today. The Orifice Meter, sometimes also called a head loss flow meter, is chosen most frequently because of its long history of use in many applications, versatility, and low cost, as compared to other available flow meter types.
Single Chamber Orifice Fittings are used if frequent orifice plate changes are required and if the flow to the Orifice Fitting can be shut down, or by-passed and the line depressurized without costly interruption to the pipe- line or process. Orifice fittings of this type do not require the removal of flange bolts or spreading of flanges to remove the orifice plate. These type fittings also avoid the loss of liquid or gas from the pipeline, which occurs when flanges are separated.
Advantages
- Simple to operate
- Positive alignment of plate to line bore
- Short down time compared to OFU .
Disadvantages
- Higher cost than Orifice Flange Union
- Shut down or by-pass of line is required to change the plate
- Loss of liquid or gas in blow down process .
As with a Single Chamber Fitting the Dual Chamber de- sign also has a plate carrier. The plate carrier precisely locates the orifice plate bore concentric to the body bore by means of three locator pins. Two pins locate the plate horizontally and one pin in the bottom of the body locates the plate vertically.
Advantages
- No shut down or by-pass of line required
• Positive alignment of plate to line bore
• Minimal down time
• Simple to operate - Ease of maintenance and plate change
• No lost liquid or gas due to line blow down process
Disadvantages
- Highest price Orifice Fitting
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