PEパイプの埋設工事には防食処理が必要ですか?

2025-08-18

PEパイプの埋設工事を行う場合、多くの人が防食処理が必要かどうかを気にします。実際、PE(ポリエチレン)パイプ自体は優れた化学的安定性と耐食性を備えており、これは従来の金属パイプに比べて大きな利点の1つです。通常の状況では、PEパイプが埋設されている場合、金属パイプのような複雑な防食処理は必要ありません。

PE材料自体は、酸やアルカリ、塩霧、土壌腐食に対して強力な耐性を持っています。土壌中の化学物質と反応しにくく、金属パイプのような電気化学的腐食や腐食は発生しません。これにより、PEパイプは、ほとんどの土壌環境で、独自の材料だけで構造の完全性と優れた輸送性能を長期間維持できます。

ただし、これはPEパイプがどのような埋設環境でも完全に「裸」になる可能性があることを意味するものではありません。いくつかの例外的な状況では、パイプシステムの安全性と耐用年数を確保するために適切な保護措置を講じることを検討する必要があります。

まず、高濃度の腐食性化学物質、非常に強い酸性またはアルカリ性の土壌など、PE材料自体の許容範囲を超えた非常に過酷な土壌環境がある場合は、特別なケーシングや防食コーティング(ここでのコーティングは、従来の意味での防食ではなく、極端な化学腐食に対するものです)。第二に、土壌に鋭利な石が多く含まれている、地面に重い負荷がかかることが多い、建設掘削などの潜在的な干渉があるなど、機械的損傷のリスクがある可能性のある場所では、PEパイプの外壁が引っかかれたり、圧力によって損傷したりするのを防ぐために、通常、クッション層(細かい砂、細かい土など)の敷設、警告ベルトの設置、ケーシングの保護などの対策が講じられます。これらの対策の主な目的は物理的な保護ですが、損傷によって引き起こされる可能性のある腐食の問題からパイプラインを間接的に保護します。

さらに、PEパイプラインは、輸送、保管、建設の過程で、紫外線の老化を防ぐために、長期間日光にさらされないようにする必要があります。これは埋設後の防食処理ではありません埋設工事では、パイプ接続(ホットメルト、電気メルト接続など)の品質を確保することが非常に重要です。高品質のインターフェースは、外部の水分や土壌粒子の侵入を効果的に防ぎ、パイプの全体的な防食性能を間接的に保証します。

要約すると、PEパイプは、従来の土壌環境での優れた耐腐食性により、通常、特別な防食処理を必要としません。しかし、極端な腐食環境、高い機械的損傷のリスクなどの特殊な作業条件に直面して、十分な工学的調査と評価を行い、必要に応じて、より高いグレードのPE原料の選択、保護層の増加、ケーシングの設定などの対象となる保護措置を講じる必要があります。PEパイプシステムが安全で安定した長期運用を確実にするため。同時に、規範化された施工操作と厳格な品質管理は、PEパイプの寿命を保障するためにも無視できない役割を持っています。


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