Just as an addition to what Johnny has said; check that the carbon face is antimony bound rather than resin bound. The former is more resistant to blistering and a better conductor of heat.
However, 82 degC is not so bad for hot water, but you have to remeber that the seals themselves generate...
In my experience, we've always approached this from a different perspective; i.e. does the seal meet the specified leakage criteria? If it does not and porosity is determined to be the cause, then we either replace the offending component or apply a suitable sealant and retest.
Not what you're...
Assuming seal gas is derived from discharge, the usual way around this issue is the incorporation of a booster into the seal gas system. Regardless of casing presuure, the booster will add sufficient pressure to ensure a positive flow of conditioned seal gas through the seal chamber laby at...
One problem I have experienced on more than one occasion with these seals is people misguidedly spraying them with leak detection fluid to check for leakage! The fluid migrates across the faces by capillary action and causes them to stick together.
I did not open all the photos because I am on...
You first need to determine if the liquids are being carried over in the process gas as free liquid or as vapour, which then condenses out as the pressure/temperature drops across the seal faces.
If it is free liquid then you need a good liquid knock out filter and a coalescing filter in your...
Flexibox is right. 53M stands for 53 Modified and was used to designate a system using an accumulator to store/pressurise barrier fluid.
The designation 53M was replaced with 53B quite some time ago, so you probably have an old system/drawing.
Any of the major seal manufacturers will provide you with training courses tailored to suit your needs.
If you want some good reading, API 682 is a very useful standard which contains a lot of sound advice and information. After that, try the IMechE book "Mechanical Seal Practice for Improved...
Unfortunately, I am unable to open this drawing.
Dowtherm is notorious for production of cokes and if the bellows has a carbon face, these tend to build up at the I.D. to the point that the face geometry/balance actually changes - at which point the opening force starts to exceed the closing...
Thanks to all who have responded.
I've hovered around the forum for a while now and even try to help out occasionally where Meccy seals are concerned, but instrumentation has always been a bit of a black art to me!!
Thanks again.
Paul.
Many thanks for the help so far. I guess I did not really make myself clear: I've been supplied a piece of kit which has a working pressure of 2 to 4.5 psig and a maximum of 145 psig. The system pressure is monitored by a pressure indicating transmitter which has a range of 0 - 150 barg I.e...
Just to add to the excellent response above, some mechanical seals require quite a narrow control of the pressure differential across the seals for optimum performance longevity. A typical example might be 3 bard minimum, 5 bard maximum, The chosen seal oil system needs to take this into account.
Hi Gents,
I'm going to show my ignorance here, but hopefully you'll be gentle with me.
I believe that ideally a pressure gauge should be sized so that the needle is in the middle of the range when reading normally - i.e. if I have 5 barg pressure then a gauge of 0 ~ 10 barg range would be...
Glycol/water is an excellent barrier fluid, but a few things should be kept in mind:
Use only pure monoethylene glycol (MEG).
Ideally use demineralised water.
Do not use proprietry anti-freeze - it contains additives which plate out on the seal faces.
Do not use 100% glycol - it causes high...
A lot depends on the flow characteristics of the pumping ring vs. the Plan 54 Pump.
I would have several concerns:
1) If the pumping ring is less effective than the Plan 54 Pump, it may inhibit the flow.
2) If it is more effective (unlikely) then it will be starved and therefore will likely...
It sounds to me as if you are looking for some kind of statistical analyses to support the dimensional tolerances being applied in reverse engineering.
That being the case, I guess that the company involved have the raw data, but don't know how to manipulate it to provide you with the...
Flexibox is referring to Plan 74. This is a dry gas seal using gas - usually nitrogen - as a barrier instead of liquid.
The advantages of this system is that you normally do not have to worry about the possible adverse effects of a fluid barrier leakage into the process.
If you want to use a...
1. Generally this information is provided by the seal vendor - because they know the expected leakage rates.
2. Flare pressure, normal leakage rate, properties of leakage, desired alarm/trip levels, characteristics of pressure transducer, process criticality of equipment versus hazard posed by...
There are many ifs and buts, however generally, you would only have a trip on High High primary leakage and alarm on Low seal gas supply.
Assuming you have a tandem seal with an interstage laby and secondary seal gas supply (usually nitrogen)secondary seal condition may be indicated by primary...
