The only reports I heard regarding this fire indicated that it was located at the transfer piping from the LNG storage tanks to the shipping port. That piping undergoes major thermal contractions during its cooldown from ambient to LNG temperatures, so fatigue of welded joints may be the main...
The manufacturer of a wood stove has specified that the overall R value for the floor protector be greater than or equal to 2.06 (ft2 F hr/btu). The generally listed value of R for air entrained concrete is R=3.9 per inch of thickness, implying a minimum thickness of 0.528" if air entrained...
I've been following the precipitous decline of the US and EU mfr's of electric power plant components, such as GE/Alstom/CE, BW, FW, Siemens. The loss of expertise and knowledge is astounding, and I assume that any future large central station power plants will have their components designed...
I am researching the basis of fatigue failure of weldments and the use of fracture mechanics on weld failures, and I understand the watershed events that led to modern advances in this field were based on the failure analyses of the failures that led to hundreds of dead workers on the offshore...
Based on the below link, it was announced that Sandia labs + univ of Virginia are investigating the design of a 50 MWe wind turbine, with 200m long individual blades. Called a segmented ultralight morphing rotor ( SUMR) , it uses flexible backward inclined blades that will fold into themselves...
I had recently become aware of a new class of materials called " high entropy alloys" , and would like to know if they have application for use in piping components that operate at 700-750 C ? Can these materials be welded?
"Whom the gods would destroy, they first make mad "
What is the smallest , packaged MBR wastewater system now commercially available in the US?
Is it generally accepted that the effluent from these packaged units can be discharged directly to US surface waters following UV disinfection?
"Whom the gods would destroy, they first make mad "
We have multiple cases of craze cracking near the butt welds downstream of attemporator spray nozzles at our HRSG's. The hardness of the zone near the P22 butt weld is consistently harder than the parent metal, and I suspect this is related to the lower ductility near the weld zone. The lower...
Can anyone advise if there is a real issue with embrittlement of inconel 718 at 1000F (538 C) at 0.2 atm O2?
Our application is bolting for a flange , external to a boiler. ASME sect II provides allowable stresses for such bolting to over 1100F without any notes or advice.
We heard recently...
We are installing flanges on a ahigh temperature steam line, and the flange seal ring normally is supplied with a baked-on MOS2 molybdenmum disulfide coating. The service is steam service to 500-540 C ( 932-1004 F).
We have been advised that MOS2 forms H2S when exposed to steam, and will cause...
There seems to be a contradiction in the B31.1 welding rules for fabrication and the SA 691 specificaiton for rolled and welded piping.
B31.1 table A2 permits longitudinally welded 2.25Cr pipe per astm A 691,but only classes which require heat treatment
B31.1 table 132 allows...
latest news from GE- to increase blades to a 130m max, they propose a space frame covered with a geo-fabic, simialr to old airplanes circa 1915. A 260 m rotor diameter might generate 20 MWe, by my guess. One good hail storm, though , and you're back to square one. At least the birds will bounce...
Can anyone advise the code case or interpretation that led to the revision of sect I pg-58.3.2? In particular, I need to obtain the date of effect of the wording change - prior to about 1998, that paragraph required boilers installed on a header system to use one "non-return valve" plus one...
WE have a series of power plants which use organic amines to control corrosion in their condensers. Recent testing of the vacuum pump exhaust reveals these organic amines are breaking down to simpler hydrocarbons, leading to a concern regarding accumulations of flammable gases in these low...
just heard a program on NPR , involving an interview with some MIT professors and other education "experts"- the current fear that too many eng school freshman are leaving the engineering curriculum due to difficulties adjusting to the discipline required led to their recommendation that:
-to...
There have been several failures of the dissimialr metal weld at F91- 316 piping components at combined cycle plants in the last few years, and we are proposing to be pro-active and upgrading these joints. The new joint to be proposed is 5" OD x 0.7"mw SA182 F91 to alloy 800H to SA182 F316...
There have been several recent papers that indicate it is neccesary to PWHT T23 membrane waterwalls , but I understand the current claims by boiler mfrs is that it is not neccesary.
As per the below link, there will occur fatigue cracking in the weld HAZ as the material ages at service...
In anticipation of the need to incorporate "lessons not quite learned" from the last 3 meltdowns, here is my list economically and technically achievable means to avoid repeats:
a)add a hardwired, remote , backup operating room 0.7 km away from the reactor.
b)spent fuel storage pool located...
for wet FGD systems on coal fired plants that produce marketable gypsum:
Kindly advise if anyone has a concise and documented explanation of why hydrated calcium sulphate ( gypsum) crystals form large particles when firing high sulphur coal at full load which are easily de-watered, but the...
A recent problem relates to valves supplied by a canadian valve company ( starts with a "V") for a US gas fired combined cycle plant.
Our valve spec stated "no materials sourced from China may be used ". We found the F91 forged small bore valves were stamped as forged in India, but the...
