Oil and Water Interface: How to Weight a Float Ball

Oil and water interface is a key to maintaining steady liquid level control in your separators.

In this video, Jerry from Kimray and Tim from Superior Fabrication (SFI) explain how to achieve interface with a float ball and dump valve.

How to Weight a Float Ball for Interface

A liquid level float is used to sense a water level and signal a dump valve to dump that water when it reaches a specified height. In order to perform this function, it must be properly weighted.

This weight allows the float to pass down through the upper oil pad and sense the density of the water. In this video, we use a 7″ x 12″ float that does not have any additional connections.

  1. Since there is have one connection, you will to drill a hole where the coupling is. We recommend threading a short nipple in to protect the threads before doing this. You can then drill through then end of the float ball with a half-inch drill bit.
  2. Once the hole is drilled, you can pour in dry sand for weight. Some producers also use BBs to add this weight.
  3. Then you will test your float ball in fresh water. In the video, when we first submerge the ball in the bucket of water it still has quite a bit of surface area protruding from the water. This means we don’t have enough sand inside. After adding more sand, we test it again. It has achieved the level we need and is ready to go inside a vessel.

One last note: Be sure to tape the threads carefully because it must be sealed and not let any fluid inside during production.

If you have any questions about how to weight your float ball, contact your local Kimray representative.