Presentation on theme: "1/4/2014 1 Vacuum Regulator Gas Feed Systems: Theory and Maintenance Thom DiGeronimo OperatorSchool.Com."— Presentation transcript:
1/4/ Vacuum Regulator Gas Feed Systems: Theory and Maintenance Thom DiGeronimo OperatorSchool.Com All Text, drawings and photographs Copyrighted 2005 by T DiGeronimo
1/4/ Seminar Highlights Gases and Properties The Vacuum Regulator / Ejector Element theory and function Differences by manufacturers Work and safety practices Personnel & Equipment Safety
History of the Vacuum Regulator 1 Before 1960, when James Haskett, Chlorinators Inc. founder, designed and patented the cylinder-mounted all-vacuum-operated gas chlorinator, most chlorinators worked essentially the same way. Pressure from the tanks forced the gas through one line to an ``ejector where it was mixed with water. Water pressure then forced the chlorine/water solution through another line to the ``diffuser" that injected it into the water or wastewater being treated. If either line failed, gas would escape unimpeded. Failure of any of the many valves these systems employed would also cause gas to escape. Haskett's design -- mounting the chlorinator on the cylinder and using a vacuum to pull the gas to the ejector -- eliminated the gas pressure line. This design makes it very difficult for chlorine to escape. If any part of the equipment should fail, the flow of chlorine is immediately -- and automatically -- shut off. The problem of corrosion, which contributed to the difficulties of the pressure systems, is also significantly reduced by Mr. Haskett's design, and the pressure line, the most serious source of corrosion in gas chlorination equipment, is eliminated.
History of the Vacuum Regulator 2 1/4/ In Mr. Hasketts design, chlorine gas bubbles immediately enter the main stream, and are quickly dissolved. Further, beginning with the regulator, the gas is never under pressure, and it is mixed with water in the ejector under vacuum conditions. Another important point: laws prohibiting the use of chlorine gas could be costing you a lot of money, because chlorine gas is far more economical than either sodium or calcium hypochlorite. The tank contains 100% chlorine, which can never lose strength. Calcium hypochlorite has only 65-70% total weight chlorine available, and sodium hypochlorite only 10% or less by the time it is used. You need 1.5 pounds of calcium hypochlorite, or 1.2 gallons of sodium hypochlorite (average 10%) to equal a pound of liquid (gas) chlorine. Both calcium and sodium hypochlorite lose strength in storage. Although the initial cost of gas chlorination equipment may be higher than that required for calcium or sodium hypochlorite, the savings in material costs quickly make up the difference.
6 Chlorine Gas Properties Amber Gas & Liquid Expands 460 Times Corrosive Non Flammable 3PPM Heavy Gas Will Flow Chlorine Institute
1/4/ Sulphur Dioxide Gas Properties Gas & Liquid Expands many Times Corrosive Non Flammable 3PPM Heavy Gas will Flow CGA makes rules Overfilled Tanks can explode !!!
1/4/ Liquid to Gas Properties Coefficient of expansion Needs minimum headroom With a FULL TANK Liquid expansion at any temperature can cause the tank to fail or explode !!
1/4/ Safety Equipment Required SCBA / Face Mask Filter Gas Leak Detector Leak Repair Kit A or B Properly Trained Haz-Mat People A PLAN
Safety is ALWAYS FIRST !!! OBEY YOUR SAFETY RULES 1/4/
1/4/ Tank Valves & Fusible Plugs for 150s w/ Fusible plug -- Flex Connector Yoke -- Manifold Valve
1/4/ Valves & Accessories
1/4/ Approved 150 lb Cylinder Storage Straps & Blocks - NO CHAINS - Straps & Rack Valve Covers on When NOT Being Used
1/4/ Un-Approved 150 lb Cylinder Capture
1/4/ Ton Cylinder Fusible Plugs & Valves 3 3/4 Fusible Plugs on Both Ends of Cylinders Valve Safety Cover Gas & Liquid Valves
1/4/ Ton Cylinder Valves Gas Valve (TOP) to the Right Liquid Valve (BOTTOM) to the Left
Ton Cylinder Eductor Tubes 1/4/
Safety – IT IS YOUR JOB !! 1/4/
1/4/ Proper Materials used Properly Body Plastics Metals / Hardware O rings / Gaskets Tubing Piping Valves Safety & Function
1/4/ Basic Vacuum Regulator Body Two Parts Separated by a Diaphragm Front is Vent Cavity Back is Vacuum Regulation Inlet Valve Mounting
1/4/ Vacuum Regulator Diaphragm Flexured Plastic Material Separates Body Cavities Front has pin for Indication and Control Back has Vent Valve Can be Spring Loaded to Inlet Valve Uses Vacuum / Barometric Pressure to Open Inlet Valve
1/4/ Standard Hydro Regulator
1/4/ Inlet Valve Assembly Grooved Body Alumina Bronze ( Better: Hastalloy C) Guts Teflon, Monel ABS / PVC Gaskets / O Rings Viton or Buna N
Cleaning Materials Dish Soap & Water Alcohol on MOST Plastics Lacquer Thinner on Teflon & Metals Soaking Lacquer Thinner Flash Wipe on Plastics *** Caution – This WILL Melt Plastics *** Vinegar or Muriatic Acid for Corrosion Removal 3-M Pads for Plastic Abrasion 00 – Fine Steel Wool for Metal Abrasion 1/4/