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...
The hole in the disk is used in "parallel disk" type gate valves to equalize pressure from between the disk(s). This is to prevent the fluid that becomes trapped in between the disks from causing an outward force when heated thereby preventing the disks from binding against the seating...
Thanks to all who have responded. We are wrapping up (no pun intended) our equivalency evaluation. We managed to contact manufactures of coatings and have provided MSDS, installation instructions, chemical compositions, thickness requirements, etc. We have compared the overall process of...
The U/G pipe is steel. This is not a new design or new run of pipe. This is repair to the coating of excavated Fire Service piping for corrosion and coating inspections. The pipe is 35 years old. Certain areas are shown to have sub-standard coating applications leading to backfill damage and...
OK,
Here's the deal: I am a design engineer at a nuclear plant. Our original design calls for underground fire protection piping to be coated in accordance with NFPA 24 which references AWWA C203. I am trying to find an acceptable substitute to hot applied coal tar, but in order for me to...
rme1997,
One key factor that you need in determining the HP of the boiler is the energy. You have specified the capacity in terms of kg/hr, but you also need to determine the enthalpy of the steam in terms of kJ/kg. Then you will know the amount of energy per unit time in kJ/hr. Conversions...
Thank you epoxybot for that great explaination and link.
The reason why I asked the question is that I am trying to evaluate the difference between the "hot applied" and "cold applied" and also the difference between coal tar and bitumastic coatings.
The National Fire Protection Association...
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...
Just some FYI in case anyone else is looking for similar information, there is a european standard, DIN 33411 titled, Human Physical Strength (maximum static action moments applied by male operators when actuating hand-wheels, that I found very helpfull also.
The small bypass equalization line is a product of an industry problem with gate valves for thermal binding and presure locking. This is especially true in the Nuclear industry where gate valves were used for sump recirculation isolation valves. These valves would be under large differential...
