WARD MANUFACTURING LLC (Blossburg, PA)
What is a Patent for End of sheathed tubing that includes leak detection and leak containment conditions
A fitting to the end of a length of corrugated tubing that has an outer sheath that includes an engagement ring for gripping the tubing adjacent to an at the end of the tubing’s corrugation to stop axial displacement of the retainer tubing. An end fitting with at minimum one threaded area is also included. A hollow cylindrical part that can accept and engage the engagement ring is also included. A fitting for the end includes a nut with threaded portions that are identical to the end fitting’s threaded surface as well as an inner surface that creates an inside cavity. The inner surface is characterized by an annular groove. The groove is formed by a vent which extends across the sidewall. The gasket is located within the annular groove, and part of the gasket extends into the interior cavity. It is designed to sealingly engage the sheath.
Corrugated stainless steel tubing that is plastic-sheathed or conduits (“CSST”) are widely used, for example to make connections along flow paths between gas meters and fuel-consuming appliances. Corrugated stainless steel is strong and flexible. It allows appliances to move with respect to pipes fixed to walls and similar. There is no risk of metal fatigue because of repeated bending of CSST. The plastic sheathing shields the CSST and can be madeelectrically conductive and/or fire resistant.
Termination fittings can be provided on the two CSST ends. They can be found on both sides of the CSST. The fitting that terminates is a connector structure like threaded nuts or nipples that have an inline passage or lumen that passes through liquid or gas flow. The fittings are constructed of brass, which is an excellent benefit. The termination fitting on the tubing works in conjunction with a fitting that is attached to the appliance, pipe or other tubing ends, to create a continuous flow pathway. The threads on the termination fittings are designed and fitted with enough tension to prevent the leakage of gas or liquidinto the surrounding air from between the fittings at the termination. Internal clamping structures may be used to fix the termination fittings to the ends that are cut off of stainlesssteel tubing that is corrugated. The plastic sheathing is removed tubing to prevent gas or liquid from flowing between the CSST. U.S. Pat. reveals some examples of clamping fittings. Nos. 7,055,868, 6,877.781 are herein incorporated in reference.
The plastic sheathing and the corrugated tubing could leak. Containments that aim to create a gas tight envelope around the connection between CSST and fittings for termination are widely known for instance, as disclosed in U.S. Pat. No. 7,004,510, and filed applications US 2014/0306448, as well as US 2009/0066083. These are also incorporated as reference. The objective of this invention is to provide an external housing which surrounds the junction. It also provides an opening that acts as an alarm system or discharges any leakage. They are of various levels of in complexity, and could comprise an array of telescopically connected cylindrical components, one of which has a generally radial opening as the vent.
Ending lengths of tubing to gas and liquid typically involve a brass or another metal terminating elements. They typically feature a thread that could be joined with another threaded component at one end to create a sealedflow route. The other end of the terminating element that is that faces towards the tubing, has a structure that connects to and connects to the tubing and seals it. It could be a length-flexible tubing or brass or other metal terminating element. The word “termination” is a reference to a terminal junction, like an appliance, at the point of the intermediate or end junction, at which multiple lengths or tubing connect to create an elongated flow route. Junctions that form a fork, tee or other similar structures are included. Termination fittings, also known as terminal fittings can all be described as junctions that have fittings that end at the very least one piece of tubing. When the termination fitting is at the intersection with the fitting for termination and tubing, it is preferable to have mechanical support that aligns the tubing with the fitting as it approaches the junction, as well as an elastomeric structure that provides an unquestionably long-lasting hermeticseal against leakage. Potential vibration, tension, impact , or any other effect, particularly over a duration of time, can deteriorate the quality of the mechanical connection and the seal between the corrugated stainless steel tubing and the terminationfitting.
Because there isn’t any issue in vibration or movement CSST is a good choice for tubing that is stationary. A steel pipe should suffice. However, flexible tubing may be advantageous underground in certaincircumstances, such as to simplify coupling between pipe sections that are not precisely aligned because the CSST can follow a curve. If it is necessary to utilize corrugated stainless steel tubing underground, particularly to carry flammable gas,certain measures should be taken for example, ensuring for proper venting to the free air in case the underground section were to generate a leak, which would stop a potentially hazardous accumulation of flammable gas.
In one instance a fitting to the end of the length of corrugated tubing that has an outer sheath includes an engagement ring to grip the tubing in front of an at the end of the tubing’s corrugation to stop the axial displacement of the retainer around the tubing. An end plug with at minimum one threaded surface is provided, as well as an elongated hollow cylindrical part that can accept and engage the engagement ring. The fitting’s end is also an nut with a threaded portion complementary withthe threaded surface of the plug and an inner surface that defines an inner cavity. An annular groove extends from the inside. A vent extends through the sidewall and is located between the threaded area as well as the groove. The annular groove is filled by the gasket. A portion of the gasket extends into an inner cavity and is designed to to the sheath.
In a further example, a fitting tubing assembly comprises tubing with valleys and peaks, as well as an outer sheath, and an assembly that is secured to the tubing. A wedding ring is also included to secure the tubing and stop axial displacement of the retainer. A fitting with at least one threaded surface is included in the fitting. A hollow cylindrical part which can be used to engage with an engagement ring is also included. A fitting for the end comprises a nut that has threaded portions that are in a similar manner to the threaded surface on the end plug, as well as an inner surface that creates an inside cavity. The inner surface is distinguished by an annular groove. The groove is surrounded by a vent that runs across the sidewall. A gasket is disposed inside the annular groove. some of the gasket extends into the cavity inside and is designed to seal the sheath.
Another method for terminating a length corrugated tubing using an outer sheath is the cutting of the tubing, and then forming an the endmost Corrugation. This procedure also requires removing the sheath and exposing part of the tubing. This procedure involves inserting the tubing in an engagement ring, which has a ridge located axially next to the tubing’s endmost corrugation. The method also includes using a threaded section of a nut witha threaded edge of an end plug in order to allow the ridge to grasp the tubing. The nut is constructed with an outer surface with an inner hollow and an annular groove extending from the inner surface. The nut also has an air vent that runs through the sidewall, and is located between the threaded surface and annular groove. A gasket is disposed within the annular groove in a way that a part of the gasket extends into the inside of the cavity, and seals against the sheath.
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