What are the advantages and disadvantages of the sealing flushing scheme 54+62? What are the respective risks?
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Our unit’s atmospheric and vacuum bottom discharge pumps currently use a sealing solution of type 54; due to frequent leaks in this sealing system, the management has requested that a solution of type 62 be installed. Could anyone please let us know if this is feasible? What are the advantages and disadvantages exactly? What are the risks after the changes?
This 62 scheme is suitable for single-end face sealing, and is appropriate for pumping fluids such as alkalis, salts, high-temperature oils, or low-temperature fluids. The frequent leaks of Plan 54 – is this related to the medium you’re using? If that’s the reason, there’s no need to add scheme 62 at all
In Plan 54, we use reduced-grade paraffin oil; there is only circulation without any flushing fluid. Is it because the heat in the sealed chamber cannot be removed that leakage occurs? That’s why we want to add a cooling water system to protect the seal! I wonder if this is the reason?
Adding 62 to PLAN54 is meaningless! PLAN54 requires cleaning and flushing with a stable-pressure isolation fluid; it is generally suitable for media containing particles, toxic substances, or high-temperature fluids. However, PLAN54 has only one pressure gauge; it lacks other monitoring instruments, and its mechanical seal is damaged. Rinsing solution issue
It seems pointless; it’s better to use money to get a new seal, 32+53A
All our other high-temperature pumps use 32+54; the 32 grade material is reduced paraffin oil. Since paraffin oil affects the distillation of residue at 520 degrees, it is not used in the bottom feed pump – only the 54 grade material is used
Then in that case, it’s as if the previous sealing step wasn’t rinsed! ! ! It’s normal for it to get damaged in this way! ! !
Well, isn’t this about considering adding cooling water?
PLAN32 involves flushing the mechanical seal at the upstream stage; the flushing fluid flows through the stationary and rotating rings of the mechanical seal before entering the pumped medium. Is what you use for cooling intended as flushing or as actual cooling? If it’s flushed, the hot water from the bottom pump will vaporize as it enters the medium~ If it’s cooled, then there’s still no flushing~~
Plan 62 should involve cooling; definitely, cooling water must not enter the medium. I’ve never really understood these sealing systems, so I’m turning to experts like you for advice. Do you mean that an additional flushing mechanism is necessary to improve this situation?
PLAN62 is used for flushing the end of mechanical seals; it is effective only in situations where the medium tends to crystallize or solidify, at high or low temperatures (below zero), and when a pumped medium is used. Since you are currently using external flushing, the flushing medium is surely clean and not at high temperature, so there is little point in using PLAN62； Your pump’s mechanical seal is itself a series-type mechanical seal; the preceding seal, PLAN32, isn’t connected, so that seal relies on circulation of its own fluid instead of external flushing, which certainly makes it prone to failure ；