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D. VALVES <br />I. Cylinders <br />a) Chlorine cylinders are to have a single chlorine Teflon style valve produced by <br />Sherwood or Tekno which is equipped with a fusible 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 Teflon 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 fusible <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 straight 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 />I. Cylinders <br />a) The relief device on chlorine cylinders is a fusible metal plug in the cylinder <br />valve located below the valve seat. The fusible metal is cast into an 'Alloy "B" or <br />Alloy "A" holder ivhich 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) Ton container valves contain no fusible plugs. Tlie container itself is equipped <br />with six threaded fusible plugs, three in each Dead, spaced appr•oxinzately 120° <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 appurtenances, 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 />