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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 Teloho which is equipped with a fztsible metal plazg-type relief <br />device. This is a Hurst 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. ilchen 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 fizsible <br />metal type reliefdevice, and the valve seat diameter may be larger than on most <br />cylinder valves. There are tow sizes ofton container valves: 3/4 inch NG7'and 1 <br />inch NGT. <br />3. Valve Outlet Threads <br />a) Outlet tlu•eacls on cylinder annd ton containers are special straight threads <br />(1, 030" - 14NGO-R1J-EX7) which conform to connection number CGA 820 and <br />B20C ii,lzich itilize a yoke -type connneclion. These threads are to acco»unodate <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 c}dinders is a futsible metal plug in the cylinder <br />valve located below the valve seat. The fiusible metal is cast into an Alloy "B" 07- <br />Alloy <br />rAlloy 'A" holder which is screwed into a tapped hole in the valve body. The <br />futsible plugs are designed to inch between 158 degrees F and 165 degrees F. <br />2. Ton Containers <br />a) Ton container rah,es contain no,fztsible plugs. Tlne container itself is equipped <br />with six threaded fetsible 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 />fulling. This includes all appurtenances, such as valves andfusible plugs. <br />Criteria,for such inspection is outlined in "Cylinder and Ton container <br />Procedure for Chlorine Packaging, " Chlorine Institute Pamphlet 19, Sections 3, <br />4, and 5. <br />