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D. VALVES <br />1. Cylinders <br />a) Chlorine cylinders are to have a single chlorine style Ceodeux D174 valve which <br />is equipped with a fusible metal plug -type relief device. This is a must comply <br />.safety requirement. <br />2. Ton Container Valves <br />a) Chlorine ton containers are to have two identical chlorine style Ceodeux D174 <br />valves near the center ofone head. This is a must comply safety requirement. <br />When vertically aligned, the valve in the upper position is used for- gas <br />withdrawal, and the lower one for liquid withdrawal. The standard ton container <br />valve is identical to the cylinder valve except that it has no firsible metal type <br />reliefdevice, and the valve seat diameter may be larger than on most cylinder <br />valves. There are tow sizes of ton container valves: 314 inch NGT and 1 inch <br />NGT <br />3. Valve Outlet Threads <br />a) Outlet threads on cylinder and ton containers are special straight threads <br />(1, 030" - 14NGO-RH-EAT) 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 firsible 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 contain no fusible plugs. The container itself is equipped <br />with six threaded fusible plugs, three in each head, spaced 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 firsible 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 />