Displacer Type and Radar Types
The Hollow Float systems are used to seal the inside of gauge poles that have automatic tank gauging devices using either a Displacer or Radar to sense the level of the product, and in some cases the water level at the bottom of the tank.
The Displacer Type Hollow Float is designed to seal the gauge pole, act as a secondary stilling well, and allow the displacer to operate without interference.
The Hollow Float canister has a weight on the bottom lowering the center of gravity for more vertical stability. On the top of the Hollow Float canister there is a seal that is designed to seal the area between the gauge pole and the float. Mounted above the seal there is a relaxation chamber that helps ensure the displacer is not affected by a sudden movement of the float. i.e., if the float was to catch or drag slightly, when it came free, there would be minimal effect on the displacer. On the top of the relaxation chamber is a bonded rubber gasket.
Displacer Float Relaxation Chamber
A separate component of this float system is the “Hat”, which performs two functions: The displacer cable passes through the center of the hat, so that when lowering the displacer, the hat always acts as a guide to ensure that the displacer passes through the center of the Hollow Float and with the displacer at rest on the liquid surface, the hat is sitting on the bonded gasket and seals the float’s center hole. All parts of the Hollow Float system remain in the gauge pole except for the lid, which is raised when the displacer is raised. The weight of the Hat is approximately 89 grams.
The Hollow Float may be used as a Displacer Type Float or a Radar Float by changing the “Hat” to a reflector plate (see Radar float below):
RADAR FLOAT (TYPE 1)
Ultra check’s Hollow Radar Float (Type 1) is used to seal the inside of gauge poles that have an automatic level-measurement device using a Radar system to sense the level of the product. The “Radar-Type” Hollow Float is designed to seal the gauge pole, act as a secondary stilling well and to allow for gauging by lifting the “reflector plate” and gauging through the center of the float.
The Hollow Float canister has a weight on the bottom lowering the center of gravity for more vertical stability. On the top of the Hollow Float canister there is a seal that is designed to seal the area between the gauge pole and the float. Mounted above the seal is a bonded rubber gasket and a radar “Reflector Plate”.
Both Hollow Float systems come with the tools (shown below) necessary to launch and retrieve the float body & hat. Installation can be accomplished in less than an hour on an operating Tank. (More on this at bottom of page)
Launch & Retrieval Device (for Float Body)
The alternative to Hollow Radar Float (Type 1) shown above is our Radar Float (Type 2) shown below:
RADAR FLOAT (Type 2)
This type of float is desirable when you are unable to use the Hollow Radar Float because the gauge pole size is too small. Ultra Check’s Radar Float (Type 2) has a seal mounted on top of an aluminum float with a tube passing down its center. There is a center rod that goes thru the center tube, clamped on top and bottom of the float and extending down about 18” with a weight attached to the end of the center rod. The radar reflector is the top of the twin seals. The seals are designed to seal the inside diameter of the gauge pole using minimum contact pressure with the wall. The weight attached to the bottom of the center rod is for vertical stabilization.
The Radar Float (Type 2) uses a “Quick Release” device for launching the float and our “Birdcage Centering Device” for retrieval.
Note: **The Hollow Floats “Displacer Type & Radar Type 1″ both use the Launch & Retrieval device explained below to launch & retrieve the Float body while using the “Birdcage Centering Device” to retrieve the Displacer Hat and Radar Plate. The Radar Float Type 2 uses a “Quick Release for launching float and the “Birdcage Centering Device” for retrieving the float.
Hollow Float Launch & Retrieval Tool for Float Body Explained
The tool is very basic and by connecting the springs (retrieval mode) or disconnecting the springs (launch mode) it makes the operation very simple.
To launch float, leave springs as they are. Pass launching device through float body and let float rest on the spreader bars. Lower float into gauge pipe until float becomes buoyant, then lower device 5” to 6” more and the weighted spreader bars will fall to a vertical position and allow the device to pass back through the hollow tube and the tool to be removed from the well.
Should you ever desire to remove the float body from the well for whatever reason, move one end of each spring from position #1 to position #2; this will allow the retrieval device to pass through the float body with slight tension on spreader bars so that once through the float body, they assume the horizontal position required to extract the float from the gauge pole. Only use this to extract the float from the gauge pole because once the spring loaded spreader bars become horizontal, the float must be removed to manually unlock the spreader bars from the float body.
The Hollow Float system can be installed from the gauger’s platform with the tank in service.