Advantages and disadvantages of plan53A and plan53B

53A is relatively cheaper, while 53B offers better performance

1. At 53A, nitrogen is in direct contact with the isolation fluid; when the pressure is above 1 MPa, nitrogen readily dissolves into the isolation fluid. Gaseous sealant causes damage to the sealing surfaces at the stationary and rotating rings. 2. For 53A, nitrogen is generally used as instrument air, with a pressure of around 0.7 MPa; it can only be applied in situations where the pressure in the sealing chamber is low, which limits its usefulness.

This post was last edited by liuyudzh on 2017-10-25 at 14:58. Plan53A – Circulating flushing of storage blocking fluid. 1. Used for abrasive media, or media that are prone to polymerization or corrosion and contain particulate impurities. 1. Leakage of the medium to the atmosphere is not allowed. 2. A small amount of contamination by the medium is permitted (minor internal leakage of the blocking fluid occurs during normal operation). 3. The pressure of the sealing fluid must be at least 1.4 bar higher than that of the medium (typically 0.14–0.41 MPa). 4. A differential pressure regulator should be used in cases where there are fluctuations in pump pressure or when the pressure exceeds 35 bar. 5. It is suitable for use with amine-rich fluids that contain H2S. 6. It can be used in applications with temperatures above 260°C (situations where PLAN52 is not suitable). Plan53B features an accumulator and a tank for circulating and flushing the blocking fluid. Its scope of application and functions are exactly the same as those of 53A. The difference is that a reservoir is used to maintain pressure.