Full heating jacket
The jacket wraps the whole pumping chamber and connects to the plant circuit: thermal oil, steam or superheated water. Where there is no boiler, the hot-spot kit heats the jacket on its own (thermal oil, up to three 300 W immersion heaters, an 8 ZV circulation pump, thermostat and expansion tank), or electric cartridges are inserted in the body. The CR handles bitumen that is not strongly abrasive, pitch, compounds, cut-back and primers, chocolate, waxes, hot-melt, resins and molasses.
SEF version for filled bitumen
Filler content in bitumen has grown over the years, and with it abrasiveness. The SEF has bearings outside the pump body, a pair of external timing gears in an oil bath that transmits the motion — so the pumping gears no longer drag tooth against tooth — and four packing seals that are inexpensive and easy to replace on site. On request, gears with modified profile for granules in suspension. An electronic torque limiter (wattmetric relay, also available in modern inverters) is recommended. Special versions exist for strongly abrasive fluids.
Models and flows
| Model | cm³/rev | 450 rpm | 950 rpm | 1450 rpm |
|---|---|---|---|---|
| 3/4 CR-a | 32.3 | 14.5 | 30.7 | 46.8 |
| 3/4 CR-b | 50.4 | 22.7 | 47.9 | 73.1 |
| 3/4 CR-c | 70.7 | 31.8 | 67.2 | 102 |
| 1 CR | 127 | 57.1 | 121 | 184 |
| 1 1/2 CR | 297 | 134 | 282 | 431 |
| 2 CR | 503 | 226 | 478 | 729 |
| 2 1/2 CR | 754 | 339 | 716 | 1093 |
| 3 CR | 1005 | 452 | 955 | 1457 |
| 4 CR | 1910 | 859 | 1814 | 2770 |
| 6 CR | 2960 | 1332 | 2812 | 4292 |
Theoretical flow in l/min (multiply by 0.06 for m³/h, by 0.377 for bbl/h). Speeds refer to 50 Hz networks; real flow depends on viscosity and pressure.