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Starting a ProMinent Pre-Engineered Systems (PES). First, ensure chemical safety by wearing eye and other protection as required by your chemical. Second, make sure that the pipes are thoroughly flushed and the union fittings are tightened. Finally, charge the pulsation dampener to 90% of the system pressure determined by the back pressure valve. (The Back Pressure Valve will be set to the minimum pressure to maintain repeatability; the Pressure Relief Valve will be set to the maximum pressure to ensure safety.)