Related Manuals for Severn Trent NXT3000 Series
Summary of Contents for Severn Trent NXT3000 Series
- Page 1 Instruction Bulletin - Series NXT3000 Cylinder, Ton Container, or Wall Mounted Vacuum Regulator 500 PPD (10 kg/h) Ton Container Mounted 100 PPD (10 kg/h) Cylinder Mounted Wall Mounted - 1 - 100.6701.11 WWW.QUANGMINHVN.COM...
- Page 2 Severn Trent Water Purification, Inc. cannot be responsible for the overall system design of which our equipment may be an integral part of or any unauthorized modifications to the equipment made by any party other that Severn Trent Water Purifica- tion, Inc.
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Page 3: Table Of Contents
Table of Contents INTRODUCTION ..............4 General . -
Page 4: Introduction
NOTE: The NXT3000 vacuum regulator is designed for use in systems where the feed rate is manually or automatically set and operation is either continuous or start/stop. The Severn Trent Services equipment warranty and service policy is null and void, as it pertains to user protection, if the NXT3000 Series vacuum regulator is misapplied. -
Page 5: Specifications
NOTE: This instruction manual covers the vacuum regulator only. Since the vacuum regulator is one part of a gas feed system, references will be made within this bulletin to meter assemblies, ejectors and other ancillary equipment that complete the various systems. Installation of a complete system is covered within. -
Page 6: Operation
OPERATION General A. Vacuum Regulator The vacuum regulator serves to reduce the supply pressure in a gas cylinder or ton container to a regulated vacuum for safe transport of the gas to the point of application. A leak in any portion of the vacuum transport line simply allows air to be pulled into the system. -
Page 7: Principles Of Operation
The manifold assembly, supplied with wall and ton container mounted regulators, has a liquid chemical trap, an wrap-around type heater and a cartridge type filter. The trap catches any condensed gas vapors (liquid chemical) which may form in the gas supply line of a wall mounted unit or the small volume of liquid chemical discharged through the gas valve of a ton container each time a new container is placed in service to prevent its entrance into the regulator. -
Page 8: Basic System Schematics
Figure 1 - Basic System Schematics 100.6701.11 - 8 - WWW.QUANGMINHVN.COM... -
Page 9: Installation
INSTALLATION Select a location which can be isolated from unauthorized personnel. Outdoor installations for cylinder or ton container mounted regulators are permissible provided that the ambient temperature will not fall below 35°F (2°C) for chlorine and ammonia systems; or, 40°F (5°C) for sulfur dioxide systems. Outdoor installations for wall mounted regulators are not recommended (especially if the gas supply system consists of two or more containers) since a sudden decrease in ambient temperature will result in the formation of condensed gas vapors (liquid chemical) in the gas supply line. -
Page 10: Cylinder Mounted Vacuum Regulators
100.6701.11 - 10 - WWW.QUANGMINHVN.COM... -
Page 11: Ton Container And Wall Mounted Vacuum Regulators
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Page 12: Mounting Cylinder Mounted Vacuum Regulators
PROCEDURE FOR MOUNTING: 1. Place the cylinder in an upright position and secure by chaining or tying to a solid support to keep it from tipping or falling. 2. Remove the valve protective hood. 3. Remove the cap from the cylinder valve. 4. -
Page 13: Mounting Wall Mounted Vacuum Regulators
GENERAL One of the gas inlet connection is fitted with a plug. The plug can be removed and installed in the opposite side if it is not convenient (when mounting on a wall) or possible (when mounting on the gas valve of a ton container) to use the open connection as supplied. -
Page 14: Connections - Wall Mounted Vacuum Regulators
NOTE: USE ONLY APPROVED TYPE FLEXIBLE CONNEC- TORS AND ADAPTOR FITTINGS, AS REQUIRED, IN THE CONSTRUCTION AND INTERCONNECTION OF ALL FLEXIBLE PIPE RUN PORTIONS OF THE GAS SUPPLY SYSTEM PROCEDURE FOR CONNECTION TO THE GAS SUPPLY SYSTEM 1. The manifold is provided with an appropriate adaptor For three or more container systems the manifold is fitting for the intended gas service. -
Page 15: Out-Of-Gas Alarm Switch
An optional, field mountable, switch is available for remote indication of a loss of gas supply. The switch may be attached directly to the vacuum regulator body without disassembling the body. Refer to Instruction Bulletin100.6703 and parts list 100.7603 for further details. The kit P/N is 674B093U02 Figure 8 - Out-of-Gas Alarm Switch VACUUM REGULATOR... -
Page 16: Wall Mounted Vacuum Switches
Accessories: Manifold Adaptor Kits: Manifold adaptor kits are available to convert the cylinder mounted vacuum regulator to either ton container or wall mounting. Wall mounting kit P/N 19558 Ton container mounting kit P/N 19560 Refer to parts list 100.7606 for detailed parts listing. Wall Mounted Vacuum Switches Figure 10 - Wall Mounted Vacuum Switches Wall mounted Nema 4X vacuum switches are available for remote indication of out of spec vacuum conditions. -
Page 17: Vacuum Regulator Exploded View
Figure 11 - Vacuum Regulator Exploded View - 17 - 100.6701.11 WWW.QUANGMINHVN.COM... -
Page 18: Meter Exploded View
Figure 12 - Meter Exploded View 100.6701.11 - 18 - WWW.QUANGMINHVN.COM... -
Page 19: Operating Instructions
OPERATING INSTRUCTIONS Initial Start-Up Prior to start-up after an extended shutdown, inspect all lines and connections, making replacements as neces- sary. If lines are transparent, inspect for blockage. Disconnect any blocked line and clean by blowing down. If lines cannot be visually inspected, disconnect the lines and blow down to make certain no blockage exists. DO NOT PRESSURE TEST THE VACUUM LINES AS EQUIPMENT DAMAGE WILL RESULT. - Page 20 B. Checking for Gas Leaks 1. General The test solution to be used in each of the following procedures is dependent upon the gas being ° handled. Use a 26 Baume' (ammonium hydroxide, aqua ammonia) ammonia solution for chlorine and sulfur dioxide systems and a 10% hydrochloric (muriatic) acid solution for ammonia systems.
- Page 21 b. Connection of a vacuum regulator to a ton container requires additional care, at start-up time, as liquefied gas will be present in the gas eduction tube of the ton container. Plug in the manifold heater and be sure that the manifold is hot to the touch. Initially the container gas valve should be opened and closed quickly to pressurize the system in order to perform a leak test.
- Page 22 e. Open the rate valve on the chlorinator and observe the rotameter. There will be an immediate indication of flow, but it should drop quickly to zero as the air in the piping system is withdrawn. If a major leak exists in the gas supply piping system the flow rate indication will not fall to zero. The source of the major leak must be found by listening to the pipe joints and/or by isolating sections of pipe by closing in-line valves.
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Page 23: Operation
WARNING Using ton containers as the gas source requires additional care at start-up time, as liquefied gas will be present in the container gas eduction tube. Slowly open the container gas valve and stop when a cavitation noise is heard. This is the liquefied gas vaporizing to its gaseous state due to the pressure drop across the valve. - Page 24 CAUTION 1. The rate valve is not designed to serve as a shut-off valve. Attempting to use it in this fashion may result in valve damage. 2. Never open cylinder, container or container type valves more than one full turn as further opening may result in valve damage. Refer to Instruction Bulletin 010.3650 for information pertaining to care of cylinders or ton containers and maintenance of gas tight seals at all coupling (and flange, if applicable) type connections.
- Page 25 C. Single Regulator Systems Utilizing Wall Mounted Vacuum Regulators The heater should be checked daily to make certain it is operating by feeling the top of the manifold drip leg to confirm that it is warm. WARNING Flexible connectors must be arranged in a smooth spiral to prevent kinking.
- Page 26 D. Dual Regulator Systems Utilizing Cylinder or Ton Container Mounted Vacuum Regulators The heater, if present, should be checked daily to make certain it is operating by feeling the top of the manifold drip leg to confirm that it is warm. If during the course of normal operation the meter assembly float suddenly begins to bounce up and down rather violently, it usually indicates that the water supply pressure to the ejector is fluctuating over too wide a range.
- Page 27 If during the course of normal operation the meter assembly float suddenly begins to bounce up and down rather violently, it usually indicates that either; a) the water supply pressure to the ejector is fluctuating over too wide a range; or b) liquid chemical is entering the "in service" regulator and "flashing off" as it is exposed to the vacuum being created by the ejector.
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Page 28: Shutdown
SHUTDOWN WARNING Before disconnecting or disassembling the ejector, shutdown the system as described in Section 5.1. Failure to do so may result in serious injury or death. Shutdown For Servicing 1. Close the gas supply valve at the pressure source(s) to shut off the gas flow. This is normally the gas cylinder and/or container valve(s) supplying the gas dispensing (regulator) system. -
Page 29: Service
When a part needs replacing, it is mandatory that the new part needs to be made of materials that will withstand the corrosive action of the gas being handled. Failure to use proper replacement parts as supplied by Severn Trent Services can result in bodily injury. - 29 - 100.6701.11... -
Page 30: Cleaning Agents
When ordering parts, always note the complete model and serial number of the gas dispensing system as well as the gas service in which it is being used. If desired, the equipment in need of repair may be returned to Severn Trent Services , 3000 Advance Lane, Colmar, PA 18915 for servicing or complete overhaul. -
Page 31: Troubleshooting Chart
TROUBLESHOOTING CHART s l i n i l . x i o l l r i f n i l n i l i l e n i l l n i l l u l l u e i l l l a c i l r i f... - Page 32 s " " s a i l s l i . y l c i l c i l l n i t t i l l a n i l l n i t r i l n i t r i t r i t l i...
- Page 33 S " " " l l a . y l t l i l n i l i f l n i l n i t l i l n i l i f e i l l l a c i l n i l t r i...
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Page 34: Appendix
APPENDIX 100.6701.11 - 34 - WWW.QUANGMINHVN.COM... -
Page 35: Vacuum Lines - Limits Of Extension
VACUUM LINE(S) – LIMITS OF EXTENSION The vacuum line(s) connecting the regulator(s) to the ejector(s), either directly or indirectly, via one or more wall mounted meter assembly, must not exceed the distance(s) presented in Figures 14 through 16 and the use of the factors provided in Table B, if applicable. - Page 36 Example C System: Single or dual regulator type with three wall mounted meter-rate valve assemblies; one having a maximum capacity of 300 lb/d (6 kg/h) and two having a maximum capacity of 100 lb/d (2 kg/h). Determination: (Refer to Figures 13 and 14 and Table B.) The vacuum lines between the single or furthest remote mounted regulator, as applicable, and the meter-rate valve assemblies and ejectors (distance “B”) can be extended up to any combination of interrelated distances as ascertained from the 500 lb/d (10 kg/h) graph.
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Page 37: Dispensing System
1000 THIS GRAPH APPLICABLE TO 100 LB/D (2 KG/H), OR LESS VALUES ADJACENT TO CURVES REPRESENT SYSTEM CAPACITY IN POUNDS PER DAY AND (KILOGRAMS PER HOUR) CONVERSION FACTOR: FEET X 0.305 = METERS DISTANCE "B" IN FEET USING 5/8 INCH (5/8 OD X 1/2 ID) TUBING Figure 14 - Vacuum Line(s) Limits of Extension vs. - Page 38 1000 THIS GRAPH APPLICABLE TO 100 LB/D (2 KG/H), OR LESS VALUES ADJACENT TO CURVES REPRESENT SYSTEM CAPACITY IN POUNDS PER DAY AND (KILOGRAMS PER HOUR) CONVERSION FACTOR: FEET X 0.305 = METERS DISTANCE "B" IN FEET USING 5/8 INCH (5/8 OD X 1/2 ID) TUBING Figure 15 - Vacuum Line(s) Limits of Extension vs.
- Page 39 1000 THIS GRAPH APPLICABLE TO 50 LB/D (1 KG/H), OR LESS VALUES ADJACENT TO CURVES REPRESENT SYSTEM CAPACITY IN POUNDS PER DAY AND (KILOGRAMS PER HOUR) CONVERSION FACTOR: FEET X 0.305 = METERS DISTANCE "B" IN FEET USING 5/8 INCH (5/8 OD X 1/2 ID) TUBING Figure 16 - Vacuum Line(s) Limits of Extension vs.
- Page 40 Design improvements may be made without notice. Represented by: Severn Trent Services 3000 Advance Lane Colmar, PA 18915 Tel +1 215 997 4000 • Fax +1 215 997 4062 Web: www.severntrentservices.com E-mail: marketing@severntrentservices.com APR/11 Copyright 2011 Severn Trent Services 100.6701.11 - 40 - WWW.QUANGMINHVN.COM...
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