So I have an elbow on a 670 psig/700F steam line that has inclusions in the base metal.
We UT'd the welds and they all came out clean, but the actual elbow itself has these small (using UTSW) inclusions throughout the elbow that cause us to get thickness readings less than min wall. Using UTSW...
I agree with Prex, but you can try other insulators to thin down the insulation and have the same R value.
I think the companies name is Aspen, they make something called aerogel. We used it on a downcomer in a 300MW plant right next to the boiler and saw no heat increases or releases. The...
Are these going on a pressure vessel?
The B31.1 code says that you must perform testing on all welds, forgings is another matter. I typically do not deal with those.
I have requested PT and MT (but not a whole lot) on o-let welds to confirm that there is no porosity in the weld surface.
I...
to further Mets answer, the code break maps are shown in Chapter 1 of ASME B31.1 and the scope section gives a very detailed description of what falls under B31.1 and what does not.
Just to give you an idea, Section 1 covers the boiler proper and piping that goes external up to certain...
B31.1 para 102.4.1 states that you should include the corrosion into the analysis but it is up to the designer to decide if the wall thickness is to be increased to account for it.
THere is no other mention in Part 1 about including corrosion, at least not that I have read yet. I would assume...
Are there other hot tapping machines out there other than the kind that require a bolted flange and a gate valve to connect to?
I would think to do this you would need to excavate, pour a concrete containment box and add an opening to run the new line that you are tapping for. Then an access...
racoopke,
I think he may be asking about that as well. Nozzles that far out do reduce the amount of stress seen on the vessel and the nozzle itself thanks to the longer welds and the surface area.
But WRC-107 does not allow for this type of nozzle over a certain R/t (vessel radius/thickness)...
WRC-107 can be used for nozzle calcs on parallel and horizontal nozzles on vessels. You can use it for tangential nozzles as well up to a point.
Refer to WRC-107 and WRC-297 for both calculations. WRC-107 limits the vessel axis to tangent distance to a point, WRC-297 extends this out to a true...
If this is a steam vent coming off a relief valve, height is part of the equation, so you need to know that first.
I would suggest looking up the G.S. Liao procedure. His paper is titled "Analysis of Power Plant Safety and Relief Valve Vent Stacks". It is very informative and follows ASME code...
I think motor eff is what you can use.
Do you have the design calc for the fan? That should give you a good estimate for what the fan is rated for and what you should be seeing.
If you are suspecting that the fan is not doing what it is supposed to, do a traverse across the outlet of the fan...
+1 on all comments, but I do want to add another.
If the header is on the back side of the water wall, it is not totally uncommon to coat the header in a red oxide primer prior to insulating. Once the unit is online and rolling at base load not much of that red oxide will be left, but it does...
Working with CFBs all I ever see is ppm and lb/mmBtu for NOx emissions.
I've never heard that ultra-low NOx was 9ppm, I don't think I've ever seen anyone that low anyways.
Lowest I've seen was 174 ppm and that equated to 0.18 lb/mmBtu
Now that I re-read MDs post, I think I misunderstood and...
So I am a winnozl user (only program we have) and I have a tangential nozzle on a 64" ID vessel. Winnozl says that I cannot do this according to WRC 107 as Rm/2=16.08" and my center to center distance is 30.08".
But somehow the manufacturer (who uses compress) says its okay per WRC 107 when...
typically cars will let air into the vehicle through the defrost vents on the dash or through the foot vents when not in operation. You can choose the "interior circulation" on most cars today which will close the outside air inlet and prevent air from getting in. But most do have "air locks"...
