Bottenutlopp

Bottenutlopp is a Swedish term for a bottom outlet, an opening at the lowest part of a container or vessel that allows the contents to be discharged. It is commonly found in tanks, cisterns, basins, sedimentation tanks, rainwater harvest systems and other process vessels. The bottom placement enables complete drainage of liquids and helps to remove sediments from the tank floor, facilitating cleaning and maintenance.

A bottom outlet usually consists of a fixed opening in the vessel wall connected to a pipe or elbow, and is often equipped with a valve for controlled discharge. Common valve types include ball valves, gate valves, or non-return valves. Materials are selected based on the contents and environment, such as PVC or polypropylene for water systems, or stainless steel and ductile iron for industrial or chemical applications. In outdoor installations, frost protection and insulation may be considered, and anti-siphon arrangements may be used to prevent backflow.

Applications and advantages: Bottom outlets allow thorough draining, flushing, and winterizing of tanks. They help minimize residual liquid and simplify cleaning and sampling. Proper design ensures that the outlet can be shut off securely and accessed for maintenance.

Design, safety and maintenance: The outlet should be placed to minimize sediment buildup and should route to an appropriate drain or processing line. Regular maintenance includes checking seals and gaskets, testing valve operation, and clearing any blockages. Compliance with local codes and safety regulations, including proper venting and isolation procedures, should be observed.