Both Lamons and Flexitallic's Gasket Handbooks have pretty descriptive explanations of 'm', 'y', and even 'Sg'. These are all pretty much design inputs for the minimum loads required to seat and seal a gasket under design operating conditions. If you are Sec.8 Div. 1, take a look at Appendix...
LIttleInch
True that to both points.
Standard charts come from published data of the four companies who manufacture CF's (yes that stands for Compact Flanges).
You are correct, sir, Standard L-005 does stop at 24", but others have made a modified design in CL2500 for larger sizes.
LittleInch,
Don't have 26" in my standard charts, but do have 24" and 30", so the 26" would be someplace in between:
NPS # Bolts Size Bolts
24" CL2500 CF 18 2-3/4"
30" CL2500 CF 24 3-1/2"
Weights, clearances would be much less than...
You can source a special flange design in this size/class from several of the hub/clamp manufacturers. I work for one so I cannot solicit on this site. Look up GC-LOK.
pogoGo,
Not over-thoinking, but here are some of the issues/comments from the dim recesses of my poor memory:
1. The extra stud length is not detrimental, it actually increases the effective length of the stud, adding to the effective elongation of the stud. This helps especially for...
rony1992,
There are no hard and fast rules, so just about anything you want to weld to it, provided you observe the basic dimensions shown in API6A. You can transition up or down in size, if you comply with the requirements shown for Welding Neck Flanges.
Materials are another matter...
If allowed by your client, take a look at hub/clamp connectors and/or compact flange designs using the same style of metal-to-metal seals. Both have been used successfully in Div. 2 vessels for years.
I work for one of the manufacturers, so I am not supposed to solicit but you may want to...
Hanson,
Seat details are normally not distributed unless under license from one of the manufacturers. I have to be very careful here as I still am employed by one of these. Usually, if a manufacturer wants to use a hub/seal design on an integral product of their manufacture, a license can be...
This is called by many names, the original Grayloc circa 1954. That design has been used from hard vacuum thru 60Ksi, and temps as high as 1800°F. Per code and actual installation measurements, seating stresses are nominally less than 5% of available joint bolt load capacity.
Why re-invent...
Matt,
Consider one of the coarser Acme thread, but relieve/wipe the first two or three threads so that your pin(male) threaded post bottoms out in the mating (female) component.
Good Luck
Rick
I may be the odd guy out, but have you considered machining a 1-1/2" Flange surface/gasket surface/drill & Tap bolt holes in the blind? Blind thickness would have to be looked at, but you save at least one if not two welds.
Good luck
Rick
Stephen,
Same design of seals, just different materials? From a practical viewpoint, you will/should trash the hydrotest seals after testing, so this shouldn't present a problem, but your client may have other ideas.
Good Luck
Rick
Use a pair of removeable air tuggers/come-alongs to lift the blind up to the point of stud engagement on the back side of the blind, they run it up with impact, then tighten to plant spec's.
Good luck
rick
