Cherne Industries Incorporated

Asim Mohammed Syed

Micah Thomas Olson

An pneumatic plug for sealing a pipeline. The pneumatic plug includes a tubular member that extends in an axial direction from a first end to a second end. The tubular member includes a rubber layer and an elastomeric band. The rubber layer extends from the first end to the second end of the tubular member. The elastomeric band is disposed on a top of the rubber layer. The elastomeric band is positioned between the first end and the second end of the tubular member.

Pneumatic plug with sealing layer

An inflatable plug for sealing a pipeline includes a tubular member, a first indicator, and a second indicator. The tubular member has an inner surface and an outer surface that extends in an axial direction from a first end to a second end. The tubular member defines a central chamber configured to inflate to a predetermined pressure so that the outer surface of the tubular member expands to contact an inner surface of the pipeline. The contact between the outer surface of the tubular member and the inner surface of the pipeline define a contact length that extends in the axial direction. The first indicator and the second indicator are positioned on the outer surface of the tubular member. The first indicator is spaced from the second indicator in the axial direction by a predetermined length. The predetermined length is substantially equal to the contact length.

Inflatable carrier plug system and method

The present invention relates to an expandable plug structure for use in high pressure applications. The expandable plugs, such as pneumatic plugs, are preferably constructed of a multi-layered, reinforced elastomeric cylindrical body, i.e., of reinforced natural rubber, and having an inflator member at one end. The multi-layers include various rubber layers, rubber coated aramid, which subsequent to vulcanization provides a unitary plug with shoulders that resist delamination. The cylindrical body may incorporate metal end plates as well as end plate weldment structures which cooperate with a high pressure flow-through conduit which allows the completed high pressure test plug to simultaneously seal a pipeline and to direct fluid therethrough. The high pressure plug obtains its strength in part based upon high frictional resistance forces generated by the external rubber layer(s), and further by the manner in which the external rubber layer) are molded into the metallic structures in the plug.

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Chanhassen, MN, United States of America

Asim Mohammed Syed