Mechanical Air & Vapor Eliminators-Air Release System Liquid Controls

Introduction
Air Eliminator is one of affiliated equipment of flow meter. It is used to separate liquid and air and filter out the impurity, to guarantee the high accuracy and long working live of flow meter.
When oil flow into filter, the mesh filter solid impurity out ,and the mesh components make fluid changes flow direction, so free air and soluble air out of fluid, and rise to separator top, forming air zone and boundary of liquid and air. With air increasing, pressure increases, and boundary descents. When the boundary descent to a specific level, matched floater act and open air valve, so air is discharged, boundary rise. Air zone narrowing lead to turning off the valve. In this process, fluid can be separated into three parts of oil, air, and gas.
when metering a liquid with a flowmeter, precise flow measurement is not possible, no matter how accurate the meter may be, if entrained air or vapor is present in the liquid. Experience shows that such entrainment often takes place at the beginning or at the end of a given metering run. An air eliminatory is used to remove entrained air and vapor before the liquid enters the meter to ensure correct flow rate measurements.

Principles of Design
Liquid Controls mechanical air and vapor eliminators remove air and vapor from metering systems. Removing the air and vapor from a metering system increases the accuracy of the meter by allowing only liquid to pass through the meter for measurement.
At installation, U-ideal mechanical air and vapor eliminators are piped to a storage tank to provide a pathway and a receptacle where the evacuated air and vapor can be deposited. After the air (or vapor) has left the metering system, mechanical air and vapor eliminators seal off the pathway to prevent liquid from entering the storage tank.

Orientation and Components
Liquid Controls mechanical air and vapor eliminators are typically bolted, in an upright position, onto the top of a strainer on the inlet side of the meter. Before operation, air and vapor eliminators must be piped to a storage tank and, on most meter systems, to an air check (or differential) valve. Installation and maintenance must be done by a qualified technician. See page 16 for Field Piping installation.

Air and Vapor Elimination
Liquid Controls mechanical air and vapor eliminators eliminate air (or vapor) instantly and continuously as it enters the meter system. Because air and vapor are lighter and less dense than liquid, they are naturally pushed up above the product flow. Air and vapor eliminators are set above the product flow so that air in the system is pushed up into the the cavity inside the air eliminator housing, out the valve plate vent ports, through the piping, and into a storage tank (see middle left figure). As air is evacuated from the system, the liquid level inside the air eliminator cavity is allowed to rise and push the float up. As the float moves up, it presses the reed strips against the valve plate sealing the vent ports and preventing product from passing through the piping and into the strorage tank. If more air enters the system, it will rise to the top of the air eliminator cavity. The air will accumulate there and push the liquid level, and the float, lower. As the float falls, the reed strips pull away from the vent ports, and air can be vented before it enters the system.

Principles of Design Dual Head Bulk Plant Air Eliminators
By employing two air eliminators, a high mount air eliminator and a low mount air eliminator, dual head bulk plant air eliminators save the metering system from shocks incurred by recurring small slugs of air (or vapor) and prevent large slugs of air from passing by the air eliminator and through the meter system. Each time a standard air eliminator removes a small slug of air, it closes the downstream differential valve. When the the differential valve closes at a high flowrate, meter systems can incur a significant hydraulic shock. Repeated shocks of this nature can shorten the life of the metering system. Dual head bulk plant air eliminators have a high mount air eliminator that eliminate small slugs of air without stopping the product flow through the meter system to save the system from shock. Dual head bulk plant air eliminators also have a low mount air eliminator to remove large air slugs. Occasionally, large slugs of air can overtake a standard air eliminator, and excess air can blow by the air eliminator and pass through the meter causing inaccurate metering. With a dual head bulk plant air eliminator and a differential valve as part of the metering system, the float in the low mount air eliminator drops in the presence of a large slugs of air, the differential valve senses the presence of air as the pressure above and below the diaphragm, and the valve closes until the large slug of air is removed. When the float rises and the valve opens, the high mount air eliminator removes the remaining air in the vessel.

Features
A wide selection of tanks and Air Eliminator Heads for proper application
Mechanical or Electrical Air Elimination Heads
Designed according to ASME Section VIII with U-stamp option

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