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Also see thread378-18541

Both ASCE 7 and the IBC (not the root beer) get modified every couple of years based on better understanding of structural response to external loadings, primarily wind and seismic. We have replaced several vertical vessels that are over 20 years old that were properly designed to the standards...

Normal pneumatic impact wrenches are too variable to use for controlled torque bolting. The torque output is dependent on a number of things such as air pressure, number of other users on the air system, worn tools (air wrenches are some of the most abused tools I have seen in industrial...

I guess I should have been more specific. I am calculating minimum renewal thicknesses on the nozzles and the flat plates of air-cooled eat exchanger (ACHE) header boxes. I am looking for a published method that accounts for the effect of the opening with respect to the 3 plates involved (i.e...

John, Do you have a copy of the Concordia paper that you would be willing to share via email or fax? If not able to share, can you provide more details (title, author, publication date, etc.) that would allow one to request it from other sources? KST

Watch what stress level you torque these bolts up to. The ambient yield stress on A193-B8 Class 1 bolts is only 30ksi and decreases with temperature. You can easily yield Class 1 bolts on the initial bolt-up and not know it. The joint will stay tight as the system heats up (bolt temperature...

Does anyone know of a published method for determining reinforcement of openings in vessels of noncircular crossection per 13-4(j)(2) of ASME VIII-1, Appendix 13? References to any such methods would be greatly appreciated. KST

Thanks, Mutt! This is exactly what I was looking for.

Does anyone know how to automatically select and display a bitmap image based on a cell value in XL? I have bitmap images of several different configurations of a design. I want to display a specific bitmap image in the spreadsheet based on a user selection from a menu. Currently I have to...

Try API-602 for small pattern valves, both sockweld and thread end.

Read the forward of the document. PCC = Post Construction Committee. This is the first document from a group that has been working to establish ASME standards for post-construction (i.e. after original fabrication) repair, alteration, and rerating of pressure vessels & piping after they have...

Check out Table 7 in ASME B16.5. This table is titled Reducing Threaded and Slip-On Flanges for Classes 150 to 2500. The table gives the smallest size of reducing outlet from the "blind" flange that requires a hub for each pipe size through 24" NPS. Threaded and slip-on...

General industry practice is to limit socketweld piping to 2" NPS. Piping 3" NPS and larger is usually buttwelded.

Check out thread378-18541. Good luck...

Use a structural Code like IBC (e.g. International Building Code, the old UBC) or ASCE 7 for determining external loads on structures due to wind, seismic, snow, ice, etc. Your local jurisdiction may specify which Code they require for this type of structure.

See thread794-18393 or do a keyword search of "air coolers" in these forums.

Check API-598 for the allowable leakage rates in either bubbles per minute or drops per minute for testing with gas (i.e. air or nitrogen) or water respectively.

Following is the basic practice I use. Other more specific criteria have been developed and shared on the COADE (Caesar II) discussion forum (www.coade.com). A. All piping connected to rotating equipment nozzles require computer analysis. Period. No exceptions. B. For all other...

What are the design and operating conditions for your hydrogen piping? What is the hydrogen partial pressure for your service? Depending on the temperature and hydrogen partial pressure you may not be able to use regular carbon steel materials. Check out API-941 (www.api.org), Steels for...

Try Forged Vessel Connections in Houston (www.forgedvesselconn.com) or Texas Metal Works (www.texmet.com) in Beaumont, both in Texas.