The leg seal is used on open-top storage tanks, often in situations where mixers are used. It reduces emissions from roof legs considerably, nowadays developing into a standard for tanks storing volatile hydrocarbons. It also ensures that the support legs remain operational by preventing rainwater ingress. The locking pin is completely surrounded by the leg seal, preventing the support legs from dropping down as a result of pin displacement caused by mixer vibrations.
The leg seal consists of two circular parts, manufactured from ﬂexible material, when combined surrounding the support leg and a part of the leg sleeve. The contact surfaces of both parts ﬁt together with tongue and groove connections; the cylindrical surfaces have a sealing proﬁle on the inside. Stainless steel hose clamps connect both individual parts against one another and around the support leg and the leg sleeve. For gastight seals pin hole plugs can be include.
The leg seal is made of EPDM rubber. This material is resistant to hydrocarbons, chemicals, ozone and is weather-proof.
The leg seal is easy to install and easily removed in order to either pull or push the legs to another position, subject to operational requirements for the tank involved.