| Traveling Barrel Insert Pumps, Thin Wall (RWT) and Heavy Wall (RHT) | |
| The Harbison-Fischer API style Traveling Barrel Pump is useful in pumping conditions that are characterized by relatively heavy particulate production. The traveling barrel helps to keep sand or other particulates in movement above the hold-down, located on the bottom of the pump, reducing the possibility of a stuck pump. The traveling valve is located on the top of the pump so that it automatically closes in times of pump inactivity, preventing particulates from settling inside the pump. The trade-off for this advantage is that the pump is not as good for gas compression as the two stationary barrel insert pumps, and that the pumping pressure is balanced on a pull tube that can bow and cause extra pump friction and wear on the pull tube. |
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