1. If a tank has gasoline inside, it has a full-length permanent manway on top, and, seen from the rear, is a recumbent oval.

2. In the mining process of medium thick steeply inclined orebody, changing the relative position of manway and pass on the stope face to suit the change of orebody can reduce the dilution rate.

3. Care must be taken to completely seal entrance plugs(eg. at a manway)in refractory linings.

4. Portable Pressure Vessel with removable top head and quick open manway.

5. Unless otherwise stated in this proposal, all trays will be top installable only and have two (2) manway vertically aligned to allow passage from above or below.