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My guess is that the batch operation of the evaporator is more to blame for thermal cycling cracks (fatigue?) than the actual operating conditions. Assuming you run this equipment 4 hrs per day and shut it down for 20 hours per day, you are cycling the evaporator from approximately room...

If you are just pumping from one tank to another in close vicinity, why not install a pump that can do 50gpm with a separate pipe run? Why do you need thousands of feet of pipe to go next door? What is the pressure at the outlet of your existing pipe with the 4000psi pump pressure? This...

Thanks for the comments. My end goal is to determine the point at which a low water cutout must be installed on a waste heat boiler to prevent a steam explosion caused by reintroducing water to a dry boiler. We currently operate a number of waste heat steam generators with no low level safety...

If you are blowing water out of the top of your high point at ~100gpm, then you have a pressure drop in the line from your high point to your discharge equal to 100gpm of frictional losses plus the extra head in your standpipe. You say you have inspected the line in the past and not found...

I sure can, Macmet. The boiler in question is a sulfur condenser in an oil refinery. It is a horizontal shell and tube steam generator with hot sulfur/ SO2/H2S vapors flowing through the tubes at 600-750F and ~10psig with boiler feedwater on the shell side making 70# saturated steam. This...

A damaged boiler, ie twisted tubes, bent stays, minor leaks, etc are a problem but not my primary concern relating to the original post. My primary concern is the perceived risk of a boiler explosion resulting in flying debris and release of the hot process gases to atmosphere. I want to...

Macmet- thanks for the reply. My application is in recovering heat from hot process gases or hot oils. We are well aware of the potential for a steam explosion due to injecting water into a hot oil pool due to a major tube leak. What we don't know is the potential for steam explosions caused...

I am trying to understand the differences between unfired waste heat steam generators and fired boilers as it applies to a low water cutout requirement. NFPA requires a low water trip on all fired boilers, presumably due to the number of boilers that have exploded when water was lost. I can not...

I am trying to understand the differences between unfired waste heat steam generators and fired boilers as it applies to a low water cutout requirement. NFPA requires a low water trip on all fired boilers, presumably due to the number of boilers that have exploded when water was lost. I can not...

Preferably you would have a company standard of your own for minimum flow based on suction specific speed, specific speed, and BEP. Barring that I would ask the vendor what the minimum flow for long term reliable operation is, not short term failure, and set the flow rate at that. 40% of BEP...

We backflowed caustic (sodium hydroxide) into an amine system due to a loss of amine pressure. The sodium levels in the amine went through the roof. What I don't know is whether or not the sodium will leave the amine when the acid gas is stripped out in the regenerator tower. Conventional...

Can anyone tell me if there is a mechanism for sodium to migrate from a heat stable salt in an MEA solution to a liquid particle in an acid gas stream leaving an amine regenerator tower? More specifically, I am wondering if there is a connection between a caustic (sodium hydroxide)incursion...

Unclesyd- your reply makes me think you have seen this issue numerous times. Can you tell me what types of refractory you've seen it in, what services, what compositions, etc? Is this a start up issue due to whatever machanism is at work or can it continue to occur over the life of the...

Thanks, Unclesyd. Our refractory is installed in blocks, no guniting. We'll defintely be talking with our supplier. You call it dusting. I called it leaching as the deposit analysis was heavily weighted to Si, while the hotface brick is primarily Alumina. Do you see similar compositions? Is...

Try contacting Mr Jeff Painter at ABB in Richmond, VA. He is a field service engineer in their turbine division. They have some similarly funky fittings for control oil, although I don't remember them being exactly like yours.

Has anyone experienced silica, alumina, or sodium leaching or volitizing out of newly installed hot face refractory in a fired furnace? We fouled a downstream waste heat boiler with a very fine, low density, thin ~1/32" coating that analyzes as Fe, Si, Al, Mn, Na, and other trace minerals. We...

Has anyone experienced silica, alumina, or sodium leaching or volitizing out of newly installed hot face refractory in a fired furnace? We fouled a downstream waste heat boiler with a very fine, low density, thin ~1/32" coating that analyzes as Fe, Si, Al, Mn, Na, and other trace minerals. We...

Controls SouthEast Inc (CSI) out of North Carolina makes bolt on valve jackets, jacketed pipe, and "contro trace" systems. Contro trace may be what you are looking for. It is often used in place of fully jacketed piping for high freeze point fluids. It's sort of a heavy duty steam tracing that...

Something else to consider in machine design is the ways the machinery will fail once put in service. They didn't teach it in school, but I recommend reviewing some of Heinz Bloch's books on machinery failure modes and troubleshooting for application on the user end. "Machinery Failure...

I agree that most of the heat from a fire will go to the atmosphere, especially a fast brush fire or tree top burn. However, I have seen the aftermath of forest fires where the ground is scorched to bare soil where the needle mat has been entirely consumed. I have heard other reports of major...