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D. VALVES <br />1. Cylinders <br />a) Chlorine cylinders are to have a single chlorine Teflon style valve produced by <br />Sherwood or Tekno which is equipped with afirsible metal plug -type relief <br />device. This is a must comply safety requirement. <br />2. Ton Container Valves <br />a) Chlorine ton containers are to have hvo identical Tef on style valves produced by <br />Sherwood or• Tekno near the center of one head. This is a must comply safety <br />requirement. When vertically aligned, the valve in the upper position is used for <br />gas Withdrawal, and the lower one for liquid withdrawal. The standard ton <br />container valve is identical to the cylinder valve except that it has no fuusible <br />metal type relief device, and the valve seat diameter may be larger than on most <br />cylinder valves. There are tow sizes of ton container valves: 314 inch NGT and 1 <br />inch NGT. <br />3. Valve Outlet Threads <br />a) Outlet threads on cylinder and ton containers are special sh•aighl threads <br />(1,030" - 14NGO-RH-EXT) which conform to connection number CGA 820 and <br />B20C Which utilize a yoke -type connection. These threads are to accommodate <br />the outlet cap only and are not to be used for chlorine hose connections. <br />E. PRESSURE RELIEF DEVICES <br />1. Cylinders <br />a) The relief device on chlorine cylinders is a fusible metal plug inn the cylinder <br />valve located below the valve seat. The f usible metal is cast into an Alloy 'B" or <br />Alloy A" holder which is screwed into a tapped hole in the valve body. The <br />fusible plugs are designed to melt between 158 degrees F and 165 degrees F. <br />2. Ton Containers <br />a) Tor? container valves contain no fusible plugs. The container itself is equipped <br />with six threaded fuusible plugs, three in each head, spaced approximately 1200 <br />apart. <br />3. Ton Container and Cylinder Inspection, Cleaning, and Reconditioning <br />a) In addition to the required period retest, it is recommended that each ton <br />container and cylinder be internally and externally inspected prior to each <br />filling. This includes all appurlenances, such as valves and fusible plugs. <br />Criteria.for such inspection is outlined in "Cylinder and Ton container <br />Procedure for Chlorine Packaging, " Chlorine Institute Pamphlet 17, Sections 3, <br />4, and 5. <br />