I am never insulted when I'm begging for information :)
To answer the questions:
What constitutes "failure"? Is is mechanical failure (cracking, breaking etc) or failure to perform or failure to seal?
The failure is in terms of the inability to function at a set-point. These parts are on a...
I am not expecting a definitive answer to the following question, I simply want some recommendations concerning preventative maintenance on high pressure oil skid fittings.
I am writing a recommendation for a customer concerning some fittings that see on average 1100 psi in a clean service. I...
That does help. The 50 F per hour is the standard I have always used and advised customers to use. I was just curious if there was a standard that recommended something different.
Thank you
This is a city inspector, and the municipality of Anchorage (and the whole state of Alaska) require UL certified equipment within a commercial business.
I agree, he seems to be going out of his way to be overly critical. His answers and justifications are all very vague and crappy, but at the...
Very interesting response, thank you very much for the information.
My next question is this: How do large suppliers like Grainger and Quincy get away with selling equipment not UL certified as an assembly? It absolutely blows my mind, and I would never have expected to have this set of...
I am in a bit of a pickle, frustrated and ill-equipped with UL and ETL standard knowledge to deal with this situation. I am hoping someone here has a deeper understanding of these certifying bodies and can help explain some things to me.
Back story: Small repair shop start-up, part of a larger...
53B with back to back arrangement is fine.
I have seen seals using only a 53B system, primarily when the service is excessively caustic or abrassive. When advantages of removing extra heat from the faces with the addition of a standard piping plan (like an 11) are overshadowed by the potential...
Just glancing over the spec sheets, it may simply be that your seal manufacturer doesn't believe that the plan 11 is needed at the heat and pressures you are running. I see nothing wrong with a tandem cartridge seal on a plan 53B flush. 53A's are easier to deal with and maintain, but the 53B...
A small edit: a plan 53 does also help with heat generation (they include a heat exchanger), I wasn't completely clear. My point was simply that a plan 11 (or similar) can subsidize the heat removal from the faces.
Happy to help, I enjoy rotating equipment. :)
A plan 11 actually can be used in conjunction with a 53, but it all depends on viscosity and what the piping can handle. The whole idea behind a 53 is ensuring the seal faces run on a cleaner fluid than can be offered by the process. However, this...
Happy to help.
1) Sorry for the confusion on the 53A, it is not attached to a tracking system. It is simply dead headed with a predetermined amount of pressure (through a regulator) and kept constant. A 53A will not be able to track up and down with a varying stuffing box pressure. For example...
As a seal guy, I would automatically recommend going to a cheap cartridge seal, carbon on silicon carbide. Will last a VERY long time and will work much better than packing.
If that's not an option, I would recommend going to the site of a packing supplier like this one...
53A: Most basic and common form of a pressurized dual seal support system. Easy to support, fill and monitor (via sight glass).
53B: Typically used when a refinery (or other manufacturer) does not want inboard seal leakage to go to flare or sump. When the inboard seal fails, instead of filling...
