Comparative analysis of ON-SPOT and TOP-SPOT
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| Demand | «ON-SPOT petroleum products loading system(telescopic) | «TOP-SPOT petroleum products loading system" (hinged) |
| 1. Reliability | worse | better |
| 2. Cost | comparable | comparable |
| 3. Diameter of filling pipe (performance) | up to 300 mm (above) | usually up to 200 mm. |
| 4. Tightness | better | worse |
| 5. Security (AUTN-96 requirements) ** | perform | under certain conditions no |
* The neck of the tank when filled is lowered by 5-10 cm. The telescopic tube has a clamping slab that descends under its own weight. On the hinge pipe, the clamping plate is performed with a single design with the pipe and this is not possible, depressurization occurs.
** When filling, it is necessary to lower the pipe to the bottom of the tank (5-7 cm), then the filling capacity should be slowly "in the trapezoidal form" increases from 20 to 100% so that there is no falling jet, which can form a static discharge of electricity. When filling 8 axle tanks with a hinge pipe, this is not provided. The tank fleet consists of 90% of 4-axle tanks, the diameter of which is 3000 mm.
If you have a pipe of a certain length with a fixed plate, then for tanks with a diameter of 3200 mm (8-axle) there will be a falling stream. c. proper sliding or tightness is not ensured. It is recommended to use a stainless insert (exclude spark formation) between the neck and the pipe, but this complicates the design.
The main difference between “ON-SPOT” and “TOP-SPOT” is the filling pipe. The filling pipe "ON-SPOT" is telescopic, and the "TOP-SPOT" has a filling pipe on the hinges, the vapor selection pipe, similar to the pipe for products, is made on hinge connections and is lowered simultaneously in a single mechanism.