Pipe joints or couplings – Having plural independent paths – For concentric tubes or pipes
Reexamination Certificate
2000-01-27
2001-12-11
Swann, J. J. (Department: 3627)
Pipe joints or couplings
Having plural independent paths
For concentric tubes or pipes
C285S123150, C285S013000, C285S302000, C285S343000
Reexamination Certificate
active
06328345
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to secondary tubing containment for metering pump discharge tubes.
BACKGROUND OF THE INVENTION
Chemical metering pumps are used to add metered amounts of chemicals to chemical feed systems used in a variety of applications such as potable water treatment, wastewater treatment, swimming pools, plating processes, mining operations, car washes, boilers, and cooling towers. In such applications, it is common for the metering pump to be mounted to a supply tank containing the fluid that is pumped by the metering pump. A discharge tube extends from an outlet fitting of the metering pump to an injector fitting that injects the metered fluid from the metering pump into a chemical feed manifold or flow conduit where the metered fluid is mixed with other fluids in the process. Some localities require that secondary tubing containment be provided for the discharge tubing of the metering pumps to prevent harmful leaks of the metered fluid should the discharge tubing rupture. One approach to providing the secondary tubing containment is to cut a containment tube to the exact length required to extend over the length of the discharge tube. While this approach may be acceptable for its intended purpose, because the length of the discharge tube will vary depending upon the particular configuration of the application, the approach requires custom fitting to obtain the desired containment and can be difficult to assemble.
SUMMARY OF THE INVENTION
It is a principal object of the invention to provide a new and improved secondary tubing containment system for use with a discharge tube of a metering pump. It is another object of the invention to provide a secondary tubing containment system that is adaptable to a number of different configurations of metering pumps and discharge tubes. More specifically, it is an object of the invention to provide a secondary tubing containment system that is adjustable in length to adapt to various lengths of discharge tubes.
In accordance with one form of the invention, a containment system is provided for use with a discharge tube of a metering pump. The discharge tube has a first end engaged in a first fitting on the metering pump and a second end engaged in a second fitting. The containment system includes a first coupling nut, a connector, a first length of tubing, a first union, a second length of tubing, a second union, and a second coupling nut. The first coupling nut is configured to sealingly engage the first end of the discharge tube in the first fitting. The first coupling nut has an opening sized to allow the discharge tube to extend therethrough to engage the first fitting. The connector has third and fourth fittings sized to allow the discharge tube to extend therethrough. The third fitting is configured to sealingly engage a portion of the first coupling nut. The connector also includes a drain port. The first length of tubing has third and fourth ends and is sized to allow the discharge tube to extend therethrough. The third end is configured to be sealingly engaged in the fourth fitting. The first union has sixth and seventh fittings sized to allow the discharge tube to extend therethrough. The sixth fitting is configured to sealingly engage the fourth end. The seventh fitting is a compression type fitting. The second length of tubing has fifth and sixth ends and is sized to allow the discharge tube to extend therethrough. The fifth end of the second length of tubing is sized to extend through the sixth and seventh fittings and into the first length of tubing. The second length of tubing is sized to be sealingly engaged in the seventh fitting. The second union has eighth and ninth fittings sized to allow the discharge tube to extend therethrough. The eighth fitting is configured to sealingly engage the sixth end of the second length of tubing. The second coupling nut is configured to sealingly engage the second end of the discharge tube in the second fitting. The second coupling nut has a portion configured to be sealingly engaged in the ninth fitting.
In one form of the invention, the third and ninth fittings are of the compression type, the first coupling nut includes a cylindrical body sized to be sealingly engaged in the third fitting, and the second coupling nut includes a cylindrical body sized to be sealingly engaged in the ninth fitting .
In another form of the invention, the third, fourth, sixth, eighth and ninth fittings are of the compression type.
In yet another form of the invention, the connector is a Tee connector and the drain port is a compression type fitting, and the containment system further includes a drain tube having an end sized to be sealingly engaged in the drain port.
Other objects, features and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings, the above summary, and the appended claims.
REFERENCES:
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patent: 4005880 (1977-02-01), Anderson et al.
patent: 4871196 (1989-10-01), Kingsford
patent: 5088774 (1992-02-01), Spiegelman
patent: 5401064 (1995-03-01), Guest
patent: 5498036 (1996-03-01), Kingsford
patent: 5681063 (1997-10-01), Bressner
patent: 6129107 (2000-10-01), Jackson
patent: 6237963 (2001-05-01), Hall
Moore John C.
Moran Kevin
Liquid Metronics, Inc.
Swann J. J.
Zeender F.
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