자료실에 올려드린 루프드레인 규격 산정식에 의해 계산하다 보면 루프드레인의 규격은 150A인데 연결 우수입상관은 루프드레인의 규격보다 작게 65A로 선정될 경우가 있으며 대부분 선홈통 입상관보다도 루프드레인의 규격이 크게 선정됨을 알 수 있습니다.

1 그러나 배관작업상 드레인과 연결배관의 규격이 다르게 작업하는것은 매우 어렵고 외부로 노출되는 루프드레인 배관의 특성상 미관으로도 보기가 좋지 않기 때문에 수직관내의 만수시 발생되는 수막현상에 의한 소음과 배수능력의 저하등을 교려할 때 선정된 우수 수직관경을 기준으로 하여 2-3단계정도 윗단계의 규격으로 하여 루프드레인 및 우수 수직관을 동일한 관경으로 선정하는것이 적정하다고 봅니다.

2. 루프드레인의 호칭규격은 KS F 4522에서 규정한 루프드레인의 호칭규격에 따라 정하고 있는데 이는 일반 배관용 탄소강관 및 배관용 스테인레스관의 규격에 맞추어 호칭규격을 정하고 있습니다.
따라서 루프드레인과 시공 가능한 선홈통 연결 사이즈는 선홈통으로 사용할 배관의 재질에 따라 시공 방법이 다르게 나타날 수가 있습니다.
건물 외벽으로 시공되는 선홈통파이프의 경우 대부분 구조용 스테인레스관을 사용하고 있기 때문에 이는 같은 호칭규격이라 할지라도 파이프의 외경이 다르게 나타납니다.(자료실의 각종 건축용 파이프 규격 참조. 호칭규격 100A의 경우 일반 배관용강관 외경=114MM, 구조용 스테인레스관 외경=101MM)
위와 같이 선홈통용 파이프로 구조용 스테인레스관을 사용할 경우 루프드레인에 직접적으로 연결할 수가 없으며 이를 해결하기 위하여 건물 외벽에 루프드레인에서 나오는 수평관과 선홈통용 파이프가 만나는곳에 상자홈통을 설치하여 이러한 문제점을 해결하고 있습니다.

일반적으로 루프드레인 규격별 선홈통용 파이프 사이즈는 선홈통 파이프를 구조용 스테인레스관을 사용할 경우
루프드레인 80A(3"파이프 외경 89.1MM), 선홈통 파이프 외경 76.3MM
루프드레인 100A(4"파이프 외경 114.3MM), 선홈통 파이프 외경 101.6MM
루프드레인 125A(5"파이프 외경 139.8MM), 선홈통 파이프 외경 127MM
루프드레인 150A(6"파이프 외경 165.2MM), 선홈통 파이프 외경 152.4MM 을 사용하고 있습니다.

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