| Bottom Hold-Down Insert Pumps, Thin Wall (RWB) and Heavy Wall (RHB) | |
| The Harbison-Fischer API style Bottom Hold-down Insert Pump is the most popular of the four basic API pumps. This is due to its ruggedness and relative simplicity. The hold-down is located at the bottom of the pump, ensuring that the pressure on the outside of the pump is equal to the hydrostatic pressure due to the column of fluid in the tubing above the pump to the surface. This characteristic balances pressure spikes on the inside of the pump caused by fluid or gas pound. The discharge of fluid from this pump is at a stationary point at the top of the pump, located the length of the pump away from the bottom hold-down. This characteristic is the trade-off for this type of pump since this stagnant fluid area can lead to corrosion of the outside of the pump barrel or allow sand or other particulates to build up and stick the pump in the tubing. |
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