Abstract: A pipe installation comprises a metal pipe supported at axially interspaced positions with the pipe between these positions having an inherent resonance so that upon receiving a vibratory force, the pipe oscillates between its supported positions at a low frequency and a consequent great amplitude which excessively stresses the pipe. A balance beam has short and long arms, the short arm being connected to the pipe between its positions of support, and a mass being connected to the long arm. In this way a smaller mass can be used to detune the pipe than would be required if the mass were to be connected directly to the pipe.