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The coolers may be mounted either horizontally or vertically but the pipe work should always be designed such that the water inlet is adjacent to the oil outlet, i.e. with flow of water and oil in opposite directions (counter flow). When mounting horizontally, venting is assisted if the water outlet positioned facing upwards. Long lengths of unsupported pipe work should be avoided and if the installation is subject to severe vibration, flexible hoses should be used or alternatively a flexible compensator flange (also available from Thermex Ltd). The cooler should ideally be installed in the return line to the tank, however where large fluctuations in flow or pressure are likely, we recommend that the cooler is mounted off-line with a separate re-circulating pump. In cold weather, a check valve to bypass oil around the cooler is recommended for oils with a high viscosity. Care should be taken to prevent the cooling water from freezing if the cooler is exposed to harsh winter conditions. If cooling with seawater, we strongly recommend that the specified water flow rates are observed. Both too little and too much seawater flow can cause erosion within the cooler. If fitting a temperature control valve, make sure it is installed on the water side and on the inlet to the cooler. Provision is made for mounting the cooler using the following bolt sizes: 2300 Series = M6, 2500Series = M8, 2700 & 2800 series = M12. Double seals and witness rings are provided on the 2700 & 2800 series units with a small leak detection hole in the witness ring, so that in the unlikely event of a seal failure, the second seal will protect from cross contamination whilst the small leak from the detection hole will alert the user to conduct repairs
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