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Guys, I'll have to take issue here. I have worked for and currently work for, one of the six or sever suppliers of this type of equipment. We all, in one way or another, make efforts to ensure compatability to some extent. There is a DNV study performed several years ago for a North Sea...

Take a look into B31.3, but pay attention to Chapter 9, High Pressure Piping. It pretty much covers most high pressure piping systems and designs.

AS a guide, use the information given by one or more of the gasket manufacturers - Flexitallic, Lamons, etc. I've used them for years, and they seem to be conservative enough for most applications.

Most knowlegible person I know would be Tom Goin at US Bolt in Houston.

API has specific material strengths for WN flanges. Please verify that your A105N is compliant before testing.

Plastic deformation of the flange can and does occur, hence the reason there are 'low stress' gaskets from most of the manufacturers,and especially in CL150 and CL300 flanges. It's not the individual bolt torque you should consider but the total resultant bolt load (clamping force) generated...

CWEng, If the damage is on the flat face of the hub, and does create a raised or depressed area further than the first 1/8" or so of the seal surface, you could probably get the supplier to inspect and recommend/comment on the need for rework. Take a look at the intended seal ring - what I...

If your application is a bolted/gasketed flange, try looking at Lamon's Bolted Joint Handbook. I've got all the others, but it serves very well for everyday use/references.

Standard pressures for all normal high load cylinders from Enerpac/PowerTeam, etc. is 10,000 psi. If you drop the pressure to 5K, you will need 2X the cylinder ID to produce 150 Tons, thereby greatly increasing the OD of the cylinder and piston. You might want to reconsider a cheap version as...

CWEng, There should be a small amount of rework material available, but that would depend on the origianl thickness of the hub face to 25° backface (clamp engagement) area. Depending on material/costs/circumstances, you may want to contact one of the field service companies, they pretty much...

No good reason for differences, but conventional practice has been to use somewhat reduced bolt preloads for SO Flanges due to the fact that without the reinforcement of the flange BackFace, these tend to rotatate/deform at lower loads.

have you looked at/into/for A182-F11 or F22 forged equivalents?

A694-F65 flanges are very common in sizes from 1" thru 12" for Offshore Production systems. I am not familiar with requests for supporting design calc's, I think because as Big Inch says, the dimensions are identical, and it's just an issue of using a higher strength material than is normally...

Depending on temperature, use a seal type which is elastically deformed, and mounted as close to the ID of the vessel as possible. There are may possible designs available, but I would be cautious about the closure mechanism(s)- threaded/breech lock styles will warp/deform, bolted joints will...

I have to be careful not to solicit your business, but I have worked for the original manufacturer of the Grayloc, and several clones. I now work for another - and it's not the one in my sign-on name. I will try to answer your questions as I see them here. I list the four majors manufacturers...

Mitulmech, Too often, 6A flanges are used as an easy out, but one thing most people tend to forget is that the title of the spec is for "Wellhead and Christmas Trees". Transition flanges traditionally attach to the production piping immediately downstream of the choke/flow restriction device...

Pattimelt, Check either Lamon's or Flexitallic's website to download their Gasketed Joint handbooks. Rubber gaskets in a flange with 4" bolts??? Something doesn't sound right. The 'm' and 'y' values have to be miniscule for that size of joint. Rick

No NPT above 10K per API. Refer to API 6A for high pressure threaded connections, they resemble the autoclave style of connections and are available from at least three sources. Rick

Spiral wound gaskets compress under bolt loads and flange rotation. All bolts/studs will experience load loss due to thread embedment and relaxation. Once this occurs, especially if the sealing surface is closer to a 125 finish than a 500, a leak can happen during a second pressurization...

Krausen, I'm no longer in that business, but there are hydraulic torque wrenches available thru 30,000 and 60,000 ft/lbs capacity. While not as inherently accurate as tensioners, they do produce a reasonable preload, and can be used successfully for applications such as yours. Stud tensioners...