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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 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 two 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 NG.T and I <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-RK--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 reliefdevice 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 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) Ton container valves cgntain no fusible plul:s. The container itse�fis equipped <br />with six threaded fusible plugv, three in each head, .slay°aced approximately 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 />