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Mechanical Air & Vapor |
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Installation & Parts |
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Eliminators |
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Liquid Controls Group An IDEX Fluid & Metering Business |
Installation: M300-10 |
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Table of Contents
Introduction |
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Safety Procedures.................................................... |
3 |
Principles of Design.................................................. |
5 |
Specifications and Dimensions................................. |
8 |
Aluminum High Mount.................................................. |
8 |
Aluminum High Pressure............................................. |
9 |
Cast Iron High Mount.................................................. |
10 |
Stainless Steel High Mount......................................... |
11 |
Steel............................................................................ |
12 |
Bulk Plant.................................................................... |
13 |
Low Mount.................................................................. |
14 |
Installation |
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Field Piping.............................................................. |
16 |
Maintenance |
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Valve Plates & Cover Gaskets................................. |
19 |
Reed Strips & Float Assemblies............................... |
20 |
Bills of Materials |
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Aluminum High Mount.............................................. |
21 |
Aluminum High Pressure......................................... |
22 |
Cast Iron High Mount............................................... |
23 |
Stainless Steel High Mount...................................... |
24 |
Steel......................................................................... |
25 |
Bulk Plant................................................................. |
26 |
Low Mount............................................................... |
27 |
Customer Service |
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Contacting the Factory............................................. |
28 |
Return Material Authorization Requests.................. |
29 |
Publication Updates and Translations
The most current English versions of all Liquid Controls publications are available on our web site, www.lcmeter. com. It is the responsibility of the local distributor to provide the most current version of LC manuals, instructions, and specification sheets in the required language of the country, or the language of the end user to which the products are shipping . If there are questions about the language of any LC manuals, instructions, or specification sheets, please contact your local distributor.
2
Safety Procedures
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NOTICE |
This manual provides warnings |
intended to inform the owner |
and/or operator of the hazards present when using the Liquid Controls Meter on LPGas and other products. The reading of these warnings and the avoidance of such hazards is strictly in the hands of the owner-operators of the equipment. Neglect of that responsibility is not within the control of the manufacturer of the meter.
Be Prepared
!WARNING
•Before using this product, read and understand the instructions.
•All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of equipment and/or systems in accordance with all applicable codes and ordinances.
•When handling electronic components and boards, always use proper Electrostatic Discharge (ESD) equipment and follow the proper procedures
•Make sure that all necessary safety precautions have been taken.
•Provide for proper ventilation, temperature control, fire prevention, evacuation, and fire management.
•Provide easy access to the appropriate fire extinguishers for your product.
•Consult with your local fire department, state, and local codes to ensure adequate preparation.
•Read this manual as well as all the literature provided in your owner’s packet.
•Save these instructions for future reference.
•Failure to follow the instructions set forth in this publication could result in property damage, personal injury, or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.
3
Safety Procedures
Safely Evacuate |
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Piping System |
! WARNING |
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Before disassembly of any meter or accessory component:
ALL INTERNAL PRESSURES MUST BE RELIEVED AND ALL LIQUID DRAINED FROM THE SYSTEM IN ACCORDANCE WITH ALL APPLICABLE PROCEDURES.
-Pressure must be 0 (zero) psi.
-Close all liquid and vapor lines between the meter and liquid source.
For Safety Rules Regarding LPG, refer to NFPA Pamphlet 58 and local authorities.
Failure to follow this warning could result in property damage, personal injury, or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.
!
In the Event of
a Gas Fire
!
In the event of large fires or fires that are spreading
nEvacuate the building and notify your local fire department.
nStop the leakage only if you can safely reach the equipment.
In the event of small, contained fires that you can safely control
nStop the leakage if you can safely reach the equipment.
nUse the appropriate extinguisher: Class B fire extinguisher, water, fog, etc., depending on the materials.
nIf in doubt, call your local fire department.
!
In the Event of
a Gas Leak
!
In the event of a large gas leak
nEvacuate the area and notify the fire department.
In the event of a small, contained gas leak
nStop the leak and prevent accidental ignition.
nPrevent the entrance of gas into other portions of the buildings. Some gases, such as LPG, seek lower levels, while other gases seek higher levels.
nEvacuate all people from the danger zone.
nSee that the gas is dispersed before resuming business and operating motors.
If in doubt, notify your local fire department.
4
Introduction
Vent Ports Open
Vent Ports Sealed
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, LC 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.
“storage tank”
In this manual, the term “storage tank,” refers to any type of receptacle meant to hold air or vapor expelled from the meter system by an air eliminator. And because mechanical air and vapor eliminators remove both air and vapor, depending on the application, the terms “air” and “vapor” are interchangeable
throughout this manual.
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.
5
Introduction
Principles of Design
Air Check and Differential Valves
Air check and differential valves are spring loaded valves on the outlet side of the meter. Most Liquid Controls meter systems with an air eliminator also have an air check or a differential valve. Air eliminators and air check (or differential) valves work in conjunction to stop the flow of product through the meter until the air is eliminated from the system. In order to do this, the air eliminator and the valve are piped together at installation
Air check (or differential) valves are normally closed, but when the pump starts and pushes product into the system, the valve spring will give way to the flow pressure. In order to keep the valve closed when air is
being expelled from the air eliminator, the air from the air eliminator is routed through the piping to the back side of the valve spring. The combined force of the expelled air and the strength of the spring keep the valve closed until the air is eliminated.
Limited Bleed Valve Plates
After the air is eliminated and the reed strips pull away from the vent ports, the air pressure on the back side of the spring is relieved and the valve opens. To avoid the system shock sustained by an abruptly opened valve, the pressure must be released slowly. In order to do this, a ″ bleed hole has been drilled into one of the valve plates so that it sits over a bypass port. The small bleed hole gradually releases the pressure on the valve spring allowing it to open it slowly.
Bypass Ports
Bypass ports provide a pathway through the mechanical air eliminator housing to allow air (or vapor) to pass from one side of the air eliminator to the other while the valve plate vent ports are sealed.
Limited Bleed Tee Assemblies
Some Liquid Controls mechanical air eliminator models are designed withot bypass ports in their housings (for example, bulk plant air eliminators). For those models to retain the functions of a limited bleed valve plate, a limited bleed tee assembly can be installed in the piping.
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Differential Valve |
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Air Check Valve |
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Valve Closed |
Valve Open |
Bypass Ports
Vent Ports
Housing |
Valve Plates |
Bleed Hole |
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Limited Bleed Tee Assembly
6
Introduction
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.
Dual head bulk plant air eliminators require a
differential valve and they can only be mounted in fixed installations. They are ideal for applications when product is being metered into storage from a truck or transport with a pump mounted on the truck.
Dual Head Bulk Plant Air Eliminator
Single Head Bulk Plant Air Eliminator with Optical Sensor
The Single Head Bulk Plant Air Eliminator with Optical Sensor performs the same functions as the Dual Head Bulk Plant Air Eliminator. Both air eliminators use a high mount air eliminator to siphon air without stopping the flow. But instead of a low mount mechanical air eliminator, the Single Head Bulk Plant Air Eliminator with Optical Sensor uses an optical sensor to identify large air slugs. When the optical sensor identifies a large air slug, it instantly signals an electronic preset or register (Toptech’s MultiLoad presets or Liquid Controls’ LectroCount registers). The electronic device closes a downstream control valve, stopping the product flow, and the air slug is quickly vented.
The optical sensor provides several advantages over its mechanical counterpart. The optical sensor’s reponse time is much faster than pneumatic-based mechanical air eliminators. The optical sensor has no moving parts or piping requirements, which can simplify installation and maintenance.
Single Head Bulk Plant Air Eliminator with Optical Sensor
7
Specifications and Dimensions
Aluminum High Mount Air & Vapor
Eliminators
For use with aluminum M-5, M-7, M-10, |
Top View |
M-15, M-25, M-30, M-40, M-60 and M-80 |
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meters. Typically installed with aluminum |
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F7, F15, and F30 strainers. |
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Working Pressure
• 150 PSI
Typical Products
• Refined Fuels
Consult the factory when certified engineering drawings are required.
Dimensions shown are not suitable for construction or modifications.
1" NPT - 2 Places
Side Views
8.5"
6"
Dimensions are of the A8197 only
8
|
Specifications and Dimensions |
High Pressure Aluminum Air & Vapor |
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Eliminators |
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For use with aluminum MA-4, MA-5, and |
Top View |
MA-7 and MA-15 meters. Typically installed |
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with the aluminum FA7 strainer. |
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Working Pressure
• 350 PSI
Typical Products
• LPG
• Anhydrous Ammonia
Consult the factory when certified engineering drawings are required.
Dimensions shown are not suitable for construction or modifications.
Side Views
Dimensions are of the A8340A only
9
Specifications and Dimensions
Cast Iron High Mount Air & Vapor
Eliminators
For use with cast iron M-7 meters. Can be |
Bottom View |
installed with cast iron F7 strainers. |
Working Pressure
• 150 PSI
Typical Products
• Chlorinated Solvents
Consult the factory when certified engineering drawings are required.
Dimensions shown are not suitable for construction or modifications.
Side Views
Dimensions are of the A8977 only
10
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