This question pertains to an interpretation or definition of "Section Thickness".
Specifically, ASME B&PV Code Section III NB-2539.4 states that radiograph inspection is required if welding repairs are made >10% of the section thickness. Does that mean "DESIGN" thickness, or "Actual"...
Can anyone tell me what is the source of information that is used to correlate weld material (on pipe) with acceptable grinding wheel material? Specifically, I am looking at a 3M Green Corp Depressed Center Wheel with 40-80% Aluminum Oxide Mineral and 10-15% Zirconium Oxide Mineral. I need to...
Could anyone please explain the difference between a Coal Tar coating hot vs cold applied? Is it just that one is liquid, the other being like a tar? Is one better than the other for underground piping? Is specifying tape with the hot applied better than not specifying?
Are they equal to or...
If a Section VIII vessel normally operates with a gas bubble, but under extreme circumstances can be lined up to fill the tank solid, does one need to protect the tank from over pressure with a gas relief AND a water relief? Would Section VII code requirements for overpressure protection be met...
Does anyone have any information regarding the exotic alloys that are to be used for "supercritical" power plants? I have information that leads me to believe that nickel based super alloys are used in boilers and steam turbine components to withstand the extreme temperatures used in the...
For large power plant boilers (500MW ~ 800MW) firing No. 6 Fuel Oil, can anyone provide info for percent unburned carbon in ash?
I appreciate any info.
Thanks.
The ASHRAE Fundamentals Handbook describes the conversion of equivalent duct sizes from circular to noncircular assuming that you start with a design of a circular duct and then convert. I am starting with an existing rectangular duct arrangement and am trying to add a section of rectangular...
Does anyone know, or have reference to, the erosion corrosion rate of a straight section of CS A106 GrB pipe under a limestone slurry service? The velocity of the slurry is 8 fps with a 44 micron limestone particle size. I am trying to justify, or prohibit, the use of straight sections of CS...
Does anyone have information or links where I can find fittings (Flanges, couplings, etc.) to connect existing asbestos cement piping (ASTM C-296) with new HDPE piping? ASTM C-296 does not specify fittings or appropriate standard for fittings.
Thanks in advance.
It seems as if the industry standard is to use carbon steel for piping in UREA systems containing ammonia vapor (Constituents are: Ammonia vapor containing approx. 23% water vapor at a max design pressure of 80 psig @ 400 deg. F) Has anyone ever experienced SS (either 304L or 316) pipe being...
Hello corossion engineers,
This is a three part question.
1) What is a reasonable corrosion/erosion allowance for A335 GR P5 (5CR-1/2MO) alloy pipe for use in determining minimum wall pressure/temperature ratings per ASME B31.1 (Power Piping)?
I was told that for an erosive service an...
Has anyone sucessfully used an ORP in a dechlorination system for proper chlorine control below .5 mg/l residual? I know that there are many claims as to having proper control capabilities, but for every one that is for the ORP for chlorine control, there is one against it.
