Not much more, you guys covered most of it. I've seen RTJ's almost exclusively in the oil refinery industry. Also, almost always extremely high pressure applications.
Hi Gordon
What are the disadvantages of the RTJ?
I had heard over the years:
Fussy to align (e.g. cold spring).
Difficult to repair sealing face damage.
Extreme cleanliness required during assembly.
Joint arrangement needs careful design to permit dismantling, e.g. removal
of valves.
Joints requiring frequent dismantling can be troublesome.
I have only used them on tubestill oil heaters for fire prevention reasons. They worked well, but I do remember a number of fitters grizzling about the general use of RTJs.
Perhaps you could offer a more informed opinion than mine, as mine is based only on hearsay and not personal experience. Davis may have something useful to add - if he can get some time off from the car sales lot.
Cheers
Steve
-----Original Message-----
From: Gordon.Reddek@Alcan.com [mailto:Gordon.Reddek@Alcan.com]
Sent: Monday, February 16, 2004 11:53 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Current Interesting Link - SPO Compact
Flange
Suresh,
Most flanges have a fairly soft gasket between them to form the seal that
prevents the fluid escaping from the flanged joint. Common gaskets are
made from a sheet of fibrous material bound in a cement type compound, or
rubber. They can also be a layer of corrugated steel or a complicated
layer made up from a spiral of stainless steel and fibrous material. Just
about any idea you can think of to form a seal between the faces of the
flanges has already been developed and are in use. A seal ring is simply
a hard ring placed between the flanges to form a seal like a gasket. It
always sits in a groove machined into the face of each flange. The
grooves in the flanges and the seal rings have to be carefully machined to
match each other well. Here too there are a number of possible designs
but the most common is called a RING TIGHT JOINT which is commonly
abbreviated to RTJ.
The following is a site you can visit which shows details of RTJ flanges.
Click on the RTJ flange section.
http://www.texasflange.com/Dimensioncutsheet.htm You will notice that the
flanges all have grooves into which the seal ring fits.
This system has a number of advantages. The ring aligns the joint exactly
so the flange is always perfectly aligned when assembled. The seal ring
is wedged into the groove and contacts the groove along two lines of
contact in each groove. When you tighten up the flange all the force
goes into pressing the ring into the groove and the contact force along
those lines of contact are very high indeed, and that is what makes it an
effective sealing device. These rings seal so well that they are the most
commonly used sealing method in large high pressure installations.
Surf the web using the terms "RTJ" and "Flange" in the search engine. You
will find heaps if very interesting information on this type of joint.
Jagarlamudi.Suresh@ril.com
14/02/2004 12:57 PM
Please respond to PipingDesign
To: PipingDesign@yahoogroups.com
cc:
Subject: Re: [PipingDesign] Current Interesting Link - SPO
Compact Flange
Dear friends,
What is the meaing of sealring?
I know a little bit of information about flange design,But I did not hear
sealring?
please explain what it means?
from
suresh.J
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[Non-text portions of this message have been removed] Received on Sun Feb 15 20:09:00 2004
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