Pressure head and flow performance curves of the internal circulation device in mechanical seals
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Dear sea friends: According to API682-2014 7.1.2.9, for Series 3 seals or special seals, the seal manufacturer shall provide the head and flow performance curves of the pump’s internal circulation system, based on actual test data. Note: For operating conditions that are not within the scope of the tests specified in this standard, it is advisable to calculate the performance curve based on simulations or additional tests. How should this passage be understood? For which specific seals are the pressure head and flow performance curves of the internal circulation device designed?
Diaphragm type, similar to the Plan23 scheme
For mechanical seals, the curve relating pressure to flow rate in a cycle cannot be calculated accurately; it can only be determined through actual testing