異なる口径のPEパイプの水圧耐性には違いがありますか?

2025-08-18

PEパイプのアプリケーションでは、多くの人々が1つの質問に関心を持っています:異なる口径のPEパイプの水圧耐性に違いはありますか?答えはイエスですが、この違いは単に口径のサイズによって決定されるのではなく、さまざまな要因の包括的な影響を受けます。

まず、PEパイプの水圧耐性は、主に公称圧力(PN)によって表されることを明確にする必要があります。これは、パイプラインが常温で安全に輸送できる最大使用圧力です。一般的に、PEパイプの公称圧力には、PN 1.0、PN 1.6、PN 2.0などの複数のレベルがあります。値が大きいほど、圧力容量が強くなります。

では、口径と公称圧力の関係は何ですか?通常、同じ材料グレードと壁の厚さの条件下では、PEパイプの口径と耐水性は直接正または負の相関がありません。つまり、口径が大きいほど耐圧性が低くなる、または口径が小さいほど耐圧性が高くなるということではありません。たとえば、PN 1.6グレードのPEパイプ、dn 20の小口径パイプ、dn 315の大口径パイプでも、公称圧力は同じであり、理論的には耐圧の上限は同じです。

しかし、実際のアプリケーションでは、さまざまな口径のPEパイプの耐圧性に違いがあると感じるのはなぜですか?これは主に、設計および製造時に、さまざまな口径のPEパイプが、一般的なアプリケーションシナリオに応じて対応する壁の厚さと公称圧力に一致するためです。たとえば、小口径のPEパイプは、家庭用水供給、小規模灌漑、および比較的高い圧力要件を持つ他の分岐パイプラインで一般的に使用され、より高い公称圧力仕様を選択する場合があります。大口径のPEパイプは、地方自治体の給水バックボーンパイプ、下水道などに使用されます。設計圧力は、輸送距離、流量、およびその他の要因に応じて包括的に決定されます。同じ口径のPE管であっても、肉厚が異なれば、その公称圧力にも明らかな違いがあります。

したがって、PE管を選択する際には、単に口径の大きさに基づいて水圧耐性を判断することはできませんが、公称圧力(PN値)、材料等級、パイプの肉厚などのパラメータに焦点を当てる必要があります。実際の作業圧力、媒体特性、敷設環境などの要因に応じて、パイプラインシステムの安全で安定した動作を確保するために、設計要件を満たすPE管製品を選択する必要があります。特定の選択について疑問がある場合は、専門のパイプライン技術者に相談するか、関連する製品規格や設計仕様を参照することをお勧め

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