Leak-off for double packing (optional). A lantern ring and leak-off pipe are provided for removal of leakage, if any, from lower packing set.
Leak-off for double packing (optional). A lantern ring and leak-off pipe are provided for removal of leakage, if any, from lower packing set.
双重包装（备选）的破裂点。如果有，则用套环和破裂管来更换底部包装泄漏部分。