Thanks Steve,
I appreciate your time and for offering your expert advice. I have most of the information to proceed with revisions to certain spreadsheets. It is my goal to eventually include all material data for B31.1 and B31.3, plus weight data and data from some manufacturers of special...
Hello Korichnevijqiqant,
Thanks for your reply. I was wondering if there are errors in the Code. The Y table is more conservative, then I probably should use it and not the general notes. Still, it would be good not to confuse others with calculations we make.
Best regards, Ben
Which is correct in B31.1 -2010:
(1) Table 104.1.2(A) Values of Y, general note (a) which states: "For cast iron and non-ferrous materials, Y = 0."
or
(2) Table A-_ (material tables) general notes which have Y = 0.4 (except for some nickel alloys)
I realize Y = 0 is most conservative...
Hi Steve,
Thank you very much. You answered all of my questions. Those "Notes" are the fine print I was needing to see. I do have B31.1, and missed looking up the notes section for non-ferrous materials, etc.
Best Regards, Ben Nottingham
I have questions pertaining to the metal groups noted in ASME B31.3, Table 304.1.1 Values of Coefficient Y?:
Ferritic steels: Are they only the 400 series SS, duplex, and super duplex austenitic-ferritic SS?
Austenitic stainless steels: Are they 300 series SS and super SS (904L SS)...
Uploaded file shows how I use a drop-down control to show a different detail in the same space on a sheet. Detail groups each have filled backgrounds. The groups are placed one over the other. A graphic is displayed by bringing to the front...
Victaulic Pressfit is 2" and smaller sch 5 in carbon steel electrogalvanized. Also 304 and 316 SS are available. Pressures to 300 psig. My former workplace used it a lot. The SS was preferred for IA service (but not at coastal sites).
Ben N.
I cannot remember who developed this formula initially. Some changes were made by me, but I cannot explain how it works. The formula is used in a spreadsheet to calculate summations. Separate rows and columns contain dimensions in (+ or -) metric, feet, inches, fractions. These are summed and...
Example calculation per B31.1 for required thickness of titanium NPS 4, with P= 740 psig, SE = 12.1 psi, A = 0 :
when y = 0.0, tm = 0.1376
when y = 0.4, tm = 0.1343
So, I see there is little difference, and y = 0 is more conservative. Non-ferrous metals (aluminum, nickel alloys, copper, and...
Hi, B31.1 was changed in the 2005 version to show coefficient y=0 for cast iron and non-ferrous materials. The previous version had y=0.4.
Will B31.3 have a similar change?
B31.3 shows only cast iron having y=0. I assume the non-ferrous materials fall in the "other ductile metals" category.
Do internet search with keywords such as: piping calculations software spreadsheets. You will find some simple calcs and some real big time savers. Some required many hours minutes to develop.
Software for general calcs for branch reinforcement, allowable pressures, mitered elbows, SIF's, line blanks, etc., are available too. Mine are in 23 Excel spreadsheets and shown at http://www.pipingoffice.us .
Very few piping mechanics will agree to use torque wrenches in normal applications. Per Process Industries Practices piping team (PIP), ASME B16.5 flange joints w/ sp-wd gaskets should have bolts torqued until the flange faces just touch all around. Per old API doc (601?), the maximum torque to...
Using ASME B31 Piping Codes, the design wall thickness is normally determined by: t = nominal wall thickness - mill tolerance on thickness - corrosion allowance - erosion allowance - mechanical allowances, such as threading or grooving. Pipe may be ordered with a minimum wall thickness, in...
