RE: [Man.Distr] LTCS pipes in higher dia?

From: <Mahavir>
Date: Wed Feb 11 2004 - 04:51:00 EST

another point that i would like to add about RF vs RTJ Joints is that RF joints are preferred even for higher ratings (Class 900, 1500 & 2500) in case of dissimilar metallurgies. This comes from notes in some of the UOP Specs.

Mahavir

-----Original Message-----
From: Al [mailto:alwynk@shaw.ca]
Sent: 11 February, 2004 14:15
To: <a href="/group/PipingDesign/post?postID=6pH8Te5wVhNMsb25LRhAvOQFOaGfqyYBLC0iy9cdz5f3PkVeyL8S85NHpZrrzFcNQJdbD9fN0XFGD1ChInUiIp0Ukg">PipingDesign@yahoogroups.com</a>
Subject: RE: [Man.Distr][PipingDesign] LTCS pipes in higher dia?

1.A333 Gr6 is generally dual spec these days. the only difference is
generally the cost of paying for the certificate verifying the above. dont
think I'd want ot buy from mill that isnt doing this and should get the
cerrtif to verify material properties. the small savings is not worth
the

risk of getting a substandard product.

2. RTJ is generally used at higher pressures as has better leak resistance
and sealing because of lower possible flange rotation

• Al

-----Original Message-----
From: George Varghese [mailto:george@wsatkins-shj.co.ae]
Sent: Wednesday, February 11, 2004 12:02 AM
To: <a href="/group/PipingDesign/post?postID=6pH8Te5wVhNMsb25LRhAvOQFOaGfqyYBLC0iy9cdz5f3PkVeyL8S85NHpZrrzFcNQJdbD9fN0XFGD1ChInUiIp0Ukg">PipingDesign@yahoogroups.com</a>
Subject: RE: [Man.Distr][PipingDesign] LTCS pipes in higher dia?

1. NACE MR 0175 specifies materials for sour services. Does it
   specify materials according to the size range? The use of A333 Gr.6 pipe
   may
   be because of the following:
   

The minimum piping class temperature may be around zero degree Centigrade.
For sizes above 6" may require higher thickness (greater than 24.5mm) for
CS

at the intended higher pressures, hence will be required to be impact
tested

in accordance with the Code (ref. Fig 323.2.2A ASME B31.3). By using
impacted tested carbon steel like A333 Gr. 6 the design check for the
impact

testing can be avoided. I don't know the price comparison for (a) CS pipe
with impact testing and (b) Impact tested CS A333 Gr. 6. Using A333 Gr. 6
may be cost and time effective.

2. The Flange acing shall be suitable for the intended service and
for the gasket and bolting employed. Code does not prohibit RF flanges in
2500 ratings.

George

-----Original Message-----
From: Sajit Viswan [mailto:sviswan@tebodin.co.om]
Sent: Wednesday, February 11, 2004 7:55 AM
To: <a href="/group/PipingDesign/post?postID=6pH8Te5wVhNMsb25LRhAvOQFOaGfqyYBLC0iy9cdz5f3PkVeyL8S85NHpZrrzFcNQJdbD9fN0XFGD1ChInUiIp0Ukg">PipingDesign@yahoogroups.com</a>
Subject: RE: [Man.Distr][PipingDesign] LTCS pipes in higher dia?

1. Is related to the SOUR service. The NACE MR 175 standard will explain the
   reason.
   
2. Should have been RTJ. Unless if it was to match existing RF flanges.
   Might be an error in the specification. If you find please tell the group.
   

Sajit

-----Original Message-----
From: t.r. vaddi [mailto:vteju2000@yahoo.com]
Sent: Friday, January 30, 2004 8:30 AM
To: <a href="/group/PipingDesign/post?postID=6pH8Te5wVhNMsb25LRhAvOQFOaGfqyYBLC0iy9cdz5f3PkVeyL8S85NHpZrrzFcNQJdbD9fN0XFGD1ChInUiIp0Ukg">PipingDesign@yahoogroups.com</a>
Subject: [Man.Distr][PipingDesign] LTCS pipes in higher dia?

Hi folks!!!!!
In some of the shell piping classes(eg 251440) i
noticed that
1.Upto 6" A106 gr.B is specified .However above 8"
A333Gr.6 (LTCS ) is specified.I wanted know the reason
Why LTCS is required for sizes 8" and above.
2.The flanges are specified as RF (even in 2500#
rating )
instaed of RTJ.Is RF better than RTJ in higher rating
flanges?

rgards
VTRAO

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Received on Wed Feb 11 04:51:00 2004