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the rule of thumb in inches was "pi spacing, rounded up to the next multiple of 4" [i.e., 16 bolts on a 16" bolt circle; 20 bolts on an 18" BCD] so ~ 3-1/8" [80mm} between bolts

the ABS has design rules for high speed craft: http://www.eagle.org/eagleExternalPortalWEB/appmanager/absEagle/absEagleDesktop?_nfpb=true&_pageLabel=abs_eagle_portal_rules_guides_download_page&nodePath=%2FBEA+Repository%2FRules%26Guides%2FCurrent%2F61_HighSpeedCraft

sometimes they'll scribe a line 1" back on the pipe from the fitting end @ full insertion depth, so that after it's welded they can verify the gap from the outside

is it possible to have a link or stabiliser tie rod from one end to a base plate or foundation to prevent moments? Or does attachment to the compressor accomplish this?

Look in the old Taylor Forge Bolt Data Chart - it gives edge didtances & other dims by bolt size. for 3/4 bolts, they have 13/16" cL-edge. If you're really tight on space, check out Graylocs: http://www.grayloc.com/grayloc/

Could you just stand it up when complete, seal the bottom & fill with water? that would give you ~880x the pressure from the column of air. just made sure it can take the "Full of Water" weight

Hydro before PWHT would tend to relieve the favorable stresses induced by the hydrotest at concentrated stress areas, so you'd want to do it again afterwards anyway

these guys make 'em: http://www.pressureproducts.com/index.htm

WRC 107 & 297 http://www.forengineers.org/wrc/index.html

Teflon will decompose into toxic fumes that hot you can get "Fluoropolymer Fever"

Look up A.E.Blach, "Bolted Flanged Connections for Non-Circular Pressure Vessels," There were some Rectangular Flange articles ~20 years back in the ASME Transactions or the PVP booklets

AWS has a whole bunch of approved weld procedures in its B2.1 series, but it looks like this isn't one of them. https://www.awspubs.com/

could you glue it in with this stuff? http://www.cotronics.com/vo/cotr/ca_1.htm {like high temp ceramic loctite)

Blodgett's books are the best $15 you'll ever spend!!! https://ssl.lincolnelectric.com/foundation/store.asp?PID=16&cat=8

Blodgett's Design of Weldments & Design of Welded Structures have a nice analysis method for rectangular tanks

Did you guys see that Ladish has the Good Old #55 Fittings book on their Website: http://www.hackneyladish.com/Catalog.aspx [Mucho megabytes, but they don’t make ‘em like this any more! - From 1954]

try Troitsky's "Tubular Steel Structures" & AWS D1.1 for "K" joints

Harvey"s "Pressure Component Construction" ch.6.15 has info on Thermal Sleeves

Look in ASME PCC-1 "Guidelines for Pressure Boundary Bolted Flange Joint Assembly"

How about using Weldolets: http://www.bonneyforge.com/