I'm not convinced that this is necessarily a chemical attack issue. I've seen external corrosion like that on uninsulated cold water pumps that were located in a humid area. Could have been something like a leaky fitting where the seal flush connects to the pump. Any minor leakage like that...
Pump seal/packing leak. I see that as the only way to explain the corrosion extending to the top hole in the coupling guard and the small diameter piping - it was sprayed there by a running pump. Corrosion this extensive didn't happen from one day to the next - doesn't look like the...
"... so i hope at least i could help from my level to verify the design level aspects."
I believe - based on the information discussed here - that the design as it stands will leave the operations & maintenance people with significant and ongoing challenges.
It's entirely possible that my...
The boiler of course needs the capacity to deliver the amount of steam required for your process, but my question is why operate a boiler at 10 kg/cm2 when the only steam load you have appears to require a header pressure of 3-4 kg/cm2? Why spend a lot of money installing a pressure reducing...
Why wouldn't you simply install a steam boiler that operates at the required lower pressure, and just skip the PRV station altogether? Is there a future project that will require the higher pressure?
There are steam rated globe style valves that are designed to be manually throttled. I don't know how temperature sensitive this process is, but I suspect that trying to control this by hand will be frustrating.
I have designed, installed, operated & maintained hundreds and hundreds of steam...
My experience with steam pressure reductions in this range is that superheat isn't a practical issue. There's almost always some moisture level present in the steam, and that the bit of superheat you get after a pressure reducing valve is gone a few feet down the line - it just gives you better...
6" diameter steel pipe in North America is 6-5/8" OD, and has been since the 1800's.
In my experience, intermingling Imperial & metric dimensions on the same job is a recipe for disaster.
If you have one of these simple measuring tools, it instantly settles all discussions over "what size pipe...
The vendor may be allowing for the pressure drop across whatever the temperature control valves are. But who knows? This is a small installation, so with several little steam connections, I suspect nasty little solenoid valves as masquerading as "temperature control valves".
And I fully agree...
With one large control valve, you may get "hunting" on low loads. The control valve cracks-open, and immediately hits it setpoint, so the valve throttles-in. Except that it has only cracked open, so it closes fully. Now it's under the set point, so it starts to open - and immediately hits it's...
I think that people posting questions on a public forum like this should recognize ANY free advice/information they get is worth exactly what they paid for it.
Ridgid - and no doubt others - have threader heads that can handle larger pipe, in place, if required. A Ridgid 141 will thread 2-1/2" through 4" pipe. A Ridgid 161 will thread 6" and 8" pipe. They can be driven off 535 and 300 machines, or by the 700 with a square-drive adapter. I believe that...
While there are several different styles of steam traps, at the end of the day, they are just automatic valves. They open in the presence of air or water, and they close when there's steam. That's it. The amount of condensate (or air, on start-up) they pass is based on the size of the orifice...
I've had an ABSA inspector for pressure piping codes tell me - in no uncertain terms - that grooved piping (Victaulic) on our compressed air lines was not code compliant. She was wrong.
I've had a large mechanical piping contractor's in-house pressure piping quality inspector tell me - in no...
As is so often the case, we don't have enough information. What type of system is this? A fire water system in a commercial or institutional building? A low pressure steam heating system in the basement of a 120 year old apartment building? A corrugated box plant or commercial/institutional...
From the information provided, I don't see the gate (or any other style) valve in and of itself being the issue. I believe the root cause of this event as being the slug of water, from whatever source, in the steam line. If the steam trap ahead of the gate valve is correctly located close to the...
Can easily be done off an 8 or 10 foot step ladder, depending upon how tall the pipefitter is. More likely, off a manlift. If neither of those methods is suitable for whatever reason, build a scaffold. After applying whatever thread sealant is required (Teflon tape and/or whatever kind of pipe...
There are also slip-style expansion joints for steam that can be used instead of bellows. I personally LOATHE bellows expansion joints, for exactly this type of failure.
First choice - if there's enough space - expansion loops. Second choice, slip-style. If there's absolutely no other choice -...
Is it possible that the "bang" was not a water hammer event, but a expansion guide and/or anchor point failing when the line heated-up on restart, which lead to the bellows failing?
I haven't spoken to - or even thought about this guy for years - but this is where I learned about condensation induced water hammer:
https://www.kirsner.org/
Condensation induced water hammer is often FAR more destructive than the typical fast moving slug of water that is most often viewed...
