Fixed & Sliding Saddles on Pressure Vessels
Fixed & Sliding Saddles on Pressure Vessels
(OP)
We are currently designing a horizontal pressure vessel 20’ diameter X 191’ long. We are designing this vessel to rest on two saddle supports. A fixed, and a sliding saddle.
On the sliding saddle side, we are contemplating if we are to allow for slotted holes for thermal expansion or should we just have the sliding saddle rest on the concrete plinth without any guiding anchors?
I would appreciate your assistance,
On the sliding saddle side, we are contemplating if we are to allow for slotted holes for thermal expansion or should we just have the sliding saddle rest on the concrete plinth without any guiding anchors?
I would appreciate your assistance,





RE: Fixed & Sliding Saddles on Pressure Vessels
did you mean 20 feet dia. by 191 inches (16 feet) not 191 feet.
What Seismic (earthquake) location if in a zone 3 and 4 you may need FEA ANALYSIS of your saddle support design
Leonard
RE: Fixed & Sliding Saddles on Pressure Vessels
Seismic Zone Factor for Saudi Arabia is Zero.
RE: Fixed & Sliding Saddles on Pressure Vessels
RE: same as SHGUM 1 GOSP 1977. southern area production ABQUA.
RE: Fixed & Sliding Saddles on Pressure Vessels
RE: Fixed & Sliding Saddles on Pressure Vessels
I join isthill in his last questions: to completely define a solution at least pressure and temperature conditions need be known. Suppose the design pressure is quite high, otherwise wall thickness is likely to be determined by far by the support system. Is a multiple saddle support (one fixed, the others sliding) a viable alternative?
prex
http://www.xcalcs.com
Online tools for structural design
RE: Fixed & Sliding Saddles on Pressure Vessels
So, what saddle design do you use elsewhere? How have they worked? What sorts of problems have your engineering or Operations people seeen?
RE: Fixed & Sliding Saddles on Pressure Vessels
SHEDGUM GOSP in the Eastern Province of Saudi Arabia is very well known to me. I am currently building those vessels in WATIF NORTH if you know where that is, and naturally (you should know for who).
RE: Fixed & Sliding Saddles on Pressure Vessels
SHEDGUM GOSP in the Eastern Province of Saudi Arabia is very well known to me. I am currently building those vessels in QATIF NORTH if you know where that is, and naturally (you should know for who).
RE: Fixed & Sliding Saddles on Pressure Vessels
I have just sent the design temp at pressure. Naturally we do use those SS liners you mention with the PTFE pads.
Appreciate any input including what you refer to as the bolt with shoulders. I am not sure I understand you there.
Thanks in advance for your assistance.
RE: Fixed & Sliding Saddles on Pressure Vessels
I do not know what saddle design people use elsewhere. But we tend to (on long vessels such as those) have only two saddles (fixed and sliding) with the necessary liners on the sliding part of the saddle.
We are manufacturers and as such I do not know what the operations personnel may have been facing in terms of problems with saddles. I do not know of any, as if there any existent, we would certainly be the first to know.
Where about have you been working in Saudi if you don't mind me asking?
RE: Fixed & Sliding Saddles on Pressure Vessels
For the Pipeline Project PLNT 256 vessel were 5m dia by 40m long the piping set the fix end with no problems.
L. S. Thill
RE: Fixed & Sliding Saddles on Pressure Vessels
RE: Fixed & Sliding Saddles on Pressure Vessels
-suppose the anchor bolt coming out of concrete is M24 and the sliding plate thickness is 20 mm
-on the anchor bolt put a piece of pipe (preferably stainless steel) with ID 25 mm and OD say 30 mm
-length of this piece of pipe is 21 mm
-width of the slots in the saddle is 32 mm
-now when you tighten the nut (with washer) you don't compress the saddle plate against the foundation and it stays free to move.
prex
http://www.xcalcs.com
Online tools for structural design
RE: Fixed & Sliding Saddles on Pressure Vessels
These historic papers in pressure vessel design are offered for your information:
• "A Proposed Method for Finding Stress and Allowable Pressure in Cylinders with Radial Nozzles," PVP Vol. 399
• The L P Zick paper for horizontal vessels on saddles
• The Boardman paper on cone-to-cylinder juncture stresses
• "Vibrations of Vertical Pressure Vessels" by C E Freese
• "The Design of Vertical Pressure Vessels Subjected to Applied Forces" by E O Bergman
• "Evaluation of Percent Critical Damping of Process Towers" by Karamchandani, Gupta, and Pattbiraman
• "Stresses in a Pressure Vessel With a Conical Head" by G W Watts and H A Lang
All papers are self-expanding zipped or Adobe pdf files.
RE: Fixed & Sliding Saddles on Pressure Vessels
RE: Fixed & Sliding Saddles on Pressure Vessels
RE: Fixed & Sliding Saddles on Pressure Vessels
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Leonard S. Thill
RE: Fixed & Sliding Saddles on Pressure Vessels
Companion Guide to the ASME Boiler & Pressure Vessel Coad
by: K. R. Rao
ISBN: 0791801640
A comprehensive two volume set discussing a multitude of topics related to pressure vessels and piping.
Guidebook for the Design of ASME Section VIII Pressure Vessels
by: Farr & Jawad
ISBN: 0791800555
A good book for insight into the ASME vessel code. The text includes many sample calculations on the application of the code.
Pressure Vessel Design Handbook
by: Henry Bednar
ISBN: 08946403X
A more advanced vessel text with derivations of equations from basic theory.
Pressure Vessel Handbook
by: Eugene F. Megyesy
A basic text showing the major equations used. Includes many tables, sketches, and examples.
Pressure Vessel Design Manual
by: Dennis R. Moss
ISBN: 0884156478
A basic text showing the major equations used. Includes many tables, sketches, and examples.
Process Equipment Design
by: Brownell & Young
ISBN: 0471113190
An excellent text covering all aspects of pressure vessel design. Also includes chapters on aboveground storage tanks, high pressure vessels, and multilayer vessels.
Structural Analysis and Design of Process Equipment
by: Jawad & Farr
ISBN: 0471624713
A comprehensive text convering the theory behind the design of pressure vessels and tanks.
Theory and Design of Pressure Vessels
by: John F. Harvey
ISBN: 0412986515
A comprehensive text on the stresses in pressure vessels. Topics also include fracture, discontinuity stresses, design/construction consequences, and buckling.
RE: Fixed & Sliding Saddles on Pressure Vessels
PLEASE CHECK THIS OUT
http://www.codeware.com/docs/TrainingFEPipe.pdf
Leonard
RE: Fixed & Sliding Saddles on Pressure Vessels
PAST SEMINAR NOTEBOOKS AVAILABLE
Available at $75.00 per set are:
1994 ASME B31.3 Piping Code Seminar
2001 Piping Design & Pipe Stress Analysis Seminar
2001 Pressure Vessel Seminar - Sec. VIII - Div. 1, 2, 3
Order your seminar notebook from KATHY SMITH at 713-523-4565 or FAX 713-523-6767
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RE: Fixed & Sliding Saddles on Pressure Vessels
You have been of great help.
RE: Fixed & Sliding Saddles on Pressure Vessels
Regarding the seminars notes is there any bank details so we can send money by DD or TT instead of mail.mail takes long time.
shahin71
RE: Fixed & Sliding Saddles on Pressure Vessels
Boiler Pressure Vessel prep course.
The best source of information concerning the course is our website at http://ccs.goivytech.net/boiler_pressure/index.html .
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RE: Fixed & Sliding Saddles on Pressure Vessels
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Leonard