The flow-optimised construction of the ABML breakaway couplings results in shorter loading times without additional energy spending. Vice-versa, considerable pump performance (pressure loss) can be saved at identical loading performance. Furthermore, the design ensures a particularly low cavitation inclination within the coupling.
The ABML series particularly developed for marine and offshore applications is characterised by its high resistance to lateral forces. These particularly act on the coupling and could unintentionally trigger it in the case of swimming hoses.
The ABML series was particularly developed for the use between hose lines and thus is ideally suited for marine and offshore applications in where such an arrangement is usually used. It can be particularly recommended for loading processes, in which both an as high as possible flow capacity and low pressure loss is as important as the safety of an emergency separation.
ABML series breakaway couplings provide the same functions as those of the ABV series, but a much higher flow capacity due to their flow-optimised design. They are derived from the high-performance ABVL series, but show a cylindrical overlap of both housing halves, the so-called mounting. Mounting allows high radial stress-resistance so that the ABML breakaway couplings can only be triggered axially. Unintended triggering due to process-related radial stress-loads such as e.g. when hose lines or swimming hoses in the marine application are being coiled are thus avoided.
The ABML series breakaway couplings separate the line at a defined tensile load. This should be selected with a sufficient safety margin below the load limit of the line, such as the maximum tensile load of a hose line. Both coupling halves are equipped with a non-return valve each that allows to close the line impermeably when it is separated and to exclude that the medium escapes into the environment.
The basic principle:
The ABML series couplings consist of two coupling halves where one half cylindrically overlaps at the separating point (mounting). The coupling halves are connected via a pair of flanges by means of three breaking pins during normal operation. Due to mounting, the breaking pins are only loaded when purely axial tensile force is exerted. If their tensile strength is exceeded, the pins break and the flanged connection is loosened. In this case, the separated coupling halves must be closed immediately; for this purpose the two housing halves are equipped with spring-loaded non-return valves. In the operating state, they brace each other and keep the flow cross-section open. In the case of separation the mutual support effect of the valves no longer exists so that they abruptly close each cross section being released.