Piping structure

By using a pipe joint with a port and limiting the axial length of the exposed opening tube portion, the heat resistance of the opening pipe portion in piping structures with different SDRs is enhanced, enabling compliance with light heat resistance tests.

JP2025068305APending Publication Date: 2025-04-28KUBOTA CHEMIX CO LTD
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Patent Information

Application Number
JP2023178101
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-10-16
Publication Date
2025-04-28

AI Technical Summary

Technical Problem

In piping structures where pipe members with different Standard Dimension Ratios (SDRs) are connected, there is a concern about the heat resistance of the opening pipe portion, particularly in regions with smaller thicknesses, which can compromise the overall heat resistance of the piping system.

Method used

The proposed solution involves a pipe joint with a port that includes a synthetic resin opening tube portion with a thickness of 4.6 mm or more and 7.0 mm or less, connected to a pipe member with the same outer diameter but a thickness greater than 7.0 mm, using electro-fusion sockets. The axial length of the exposed portion of the opening tube is limited to 70 mm or less to enhance heat resistance.

Benefits of technology

This configuration improves the heat resistance of the opening pipe portion, allowing it to pass the light heat resistance test specified by the Fire and Disaster Management Agency, while also maintaining appropriate pressure resistance.

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Abstract

To provide a piping structure with improved heat resistance at an insertion port pipe part of a pipe joint with an insertion port.SOLUTION: A piping structure 10 comprises: an electric fusion cheese 12 (pipe joint with an insertion port) having a joint body 20 and a synthetic resin insertion port pipe part 32 with thickness of 4.6 mm or more and 7.0 mm or less; a synthetic resin pipe member 14 having the same outside diameter as the insertion port pipe part and thickness exceeding 7.0 mm; and an electric fusion socket 16 having electric fusion sockets 34 at both ends, and connecting the insertion port pipe part with the pipe member. Axial length L of an exposure part 32b of the insertion port pipe part is set to 70 mm or less.SELECTED DRAWING: Figure 1
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