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a) The ton container valves are protected during shipment and storage by a <br />removable steel valve protective housing or cap. Pressure relief devices shall <br />not be covered by the housing. <br />4. Ton Container Capacity <br />a) In cases where the capacity of a chlorine container is not known, it can be <br />determined by weighing it empty and again when completely filled with water, <br />and by multiplying the weight of'water at 60OF by 1.25. This is the maximum <br />allowable weight of chlorine allowed in the cylinder or ton container. <br />C. STAMPING <br />1. Ton Container Stamping <br />a) When manufactured, ton containers are stamped with DOT specification number, <br />material, serial number, inspector's official mark, name, mark or initials of <br />company for whose use the tank is made, (or builder's symbol and serial <br />number), date of test, and water capacity [DOT Section 179.300-18]. Tare <br />weights may be stamped by builder. Changes in stamping must be made in <br />compliance with DOT Section 173.31(d) or 49CFR. <br />2. Retest Stamping <br />a) Ton containers do not require the test facility's number on the container. <br />3. Tare -Weight Stamping <br />a) It is recommended that all new chlorine ton containers be stamped with the <br />original tare weight by the container manufacturer. <br />D. VALVES <br />1. 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 two sizes of ton container valves: 314 inch NGT and I <br />inch NGT. <br />2. Valve Outlet Threads <br />a) Outlet threads on ton containers are special straight threads (1, 030" - 14NGO- <br />RH-EX7) which conform to connection number CGA 820 and B20C which utilize <br />a yoke -type connection. These threads are to accommodate the outlet cap only <br />and are not to be used for chlorine hose connections. <br />E. PRESSURE RELIEF DEVICES <br />1. Ton Containers <br />