PE管sdrとは何ですか?

2025-08-19

PE管の選定と応用の中で、我々はよく「SDR」という用語に遭遇する。非専門家にとってSDRはなじみがないかもしれない。では、PE管のSDRとは何を意味するのか?それはどのような重要な意義があるのか?本文はあなたに詳しく解説し、西暦パイプのPE管製品と結び付けて説明する。

SDR、フルネームはStandard Dimension Ratio、中国語は「標準寸法比」と訳される。これはPE管の重要な技術パラメータで、具体的にはパイプの公称外径(dn)と公称壁厚(en)の比を指し、式で表現するとSDR=dn/enである。

この定義から、SDRは実際にPE管外径と壁厚の比例関係を反映していることがわかる。では、この比率の実際的な意味は何ですか?一般的に、SDR値が大きいほど、同じ公称外径でパイプの公称肉厚が薄くなることを意味します。肉厚が薄くなると、パイプの耐圧能力に直接影響します。したがって、SDR値が大きいPEパイプほど、耐えられる内圧は通常低くなります。逆に、SDR値が小さいほど、パイプの肉厚が比較的厚く、耐圧能力が高くなります。

実際のアプリケーションでは、ADパイプなどの専門メーカーは、一般的なSDR 11、SDR 17.6、SDR 21、SDR 26など、さまざまなSDR仕様をカバーするPEパイプ製品ラインを製造しています。これらの異なるSDRグレードは、異なる圧力グレードに対応します。エンジニアリング設計者は、特定の輸送媒体、作業圧力、敷設環境、およびエンジニアリングコストなどの多くの要因に基づいて、適切なSDR仕様のPEパイプを選択します。

たとえば、圧力の高い水道本管を輸送するために使用される場合、通常、SDR値が小さく、壁厚が厚く、圧力容量が強いPEパイプが選択されます。一部の排水、下水道、または農地灌漑の圧力要件が低い場合は、SDR値が大きく、比較的経済的なPEパイプを選択できます。ADパイプの製造プロセスでは、関連する標準に厳密に従い、各PEパイプ製品のSDR値が設計要件を満たしていることを確認し、さまざまな作業条件での製品の安全で信頼性の高い動作を保証します。

PE管のSDRの意味を理解することは、PE管材をより科学的かつ合理的に選択して使用することにより、エンジニアリングの品質と使用効果を確保するのに役立ちます。PE管の選定においてSDRの選択について疑問がある場合は、プロジェクトのニーズに最適なソリューションを得るために、専門の技術者やADパイプラインなどの正式な生産企業に相談することをお勧めします。


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