Anchor
Anchor
(OP)
Hello and good day to all respected members.
I am new to this excellent forum and I hope the more knowledgeable members don't mind my asking what must be a very basic question.
I've been doing a lot of previous work in Structures, highways, and moved over to pipelines a while back. I started designing HDDs, underground pipes and stress analysis in ASME 31.4 and API 1102 for buried mainline pipes (which generally don't require restraints since they are not on the surface. I'm now tackling surface systems .... now wish to design anchor and guides for a surface system of pipes which will of course require restraints. Generally in my previous designs to ASME, I don't usually need to look up many things as I'm given most parameters including SMYS, e.t.c
I'm aware that there are tables to relate NPS to OD, Wall Thickness /Schedule but I'm not sure if these tables also give the SMYS with the NPS
My question(s) are:
1. Given a pipe of 18 O.D , a Wall Thickness of 0.57" wall thickness and pressure rating of 300#, pls how do I obtain obtain the SMYS? Would this be 300 or do I need to look it up on a table and if so, what table can I use to relate the SMYS to the data given?
2. What code do I need to reference to design the expansion barrels?
3. What codes do I need to design the Anchors and guides?
Your answers will be very much appreciated
Thank you very much....
I am new to this excellent forum and I hope the more knowledgeable members don't mind my asking what must be a very basic question.
I've been doing a lot of previous work in Structures, highways, and moved over to pipelines a while back. I started designing HDDs, underground pipes and stress analysis in ASME 31.4 and API 1102 for buried mainline pipes (which generally don't require restraints since they are not on the surface. I'm now tackling surface systems .... now wish to design anchor and guides for a surface system of pipes which will of course require restraints. Generally in my previous designs to ASME, I don't usually need to look up many things as I'm given most parameters including SMYS, e.t.c
I'm aware that there are tables to relate NPS to OD, Wall Thickness /Schedule but I'm not sure if these tables also give the SMYS with the NPS
My question(s) are:
1. Given a pipe of 18 O.D , a Wall Thickness of 0.57" wall thickness and pressure rating of 300#, pls how do I obtain obtain the SMYS? Would this be 300 or do I need to look it up on a table and if so, what table can I use to relate the SMYS to the data given?
2. What code do I need to reference to design the expansion barrels?
3. What codes do I need to design the Anchors and guides?
Your answers will be very much appreciated
Thank you very much....





RE: Anchor
Have you read the code?
For the 2009 Revision,look at table 403.2.1-1 for SMYS.
RE: Anchor
I don't have the complete code (31.4), I only extracted the portions I had been using in the past to respect copy right issues. I will have to obtain the complete code since I'm now doing more of stress analysis and piping. I've been a generalist doing so many other things, but it looks like I will be focusing on this now
I imagined the 31.3 would have its own tables which would be different from the tables in 31.4.
Please is there a typical spacing for anchors? And if I wanted to calculate the frictional forces, would I have to take the weight of the entire pipe between anchors?
I'm also wondering if I need to look up the catalogue of expansion join manufacturers to obtain forces necessary to deflect their expansion joints or if there are values in the ASMEs.
I obviously have a lot of reading to do
Sorry for the bother...
RE: Anchor
Its an 18" line , .57 WT, with design pressure of about 550 psi to operate with temperature changes of about -40 to 40 degrees.
I'm thinking of trying as a start,anchoring about 250 meters(800 Ft approx) intervals with guides in between, calculating the forces on this arrangement and adjusting if need be.
Does this sound reasonable?
Thanks again..
RE: Anchor
RE: Anchor
RE: Anchor
I meant expansion joints for the above grade pipeline because of space constraints.
I did some calculations taking into consideration natural flexibility and observed that the offset lengths between anchors locations I was thinking about were just not sufficient, that was why I mentioned expansion joints.
Also, I'm not working on this alone, I'm just doing some very preliminary calculations for now and doing my homework along.
RE: Anchor
I was thinking more of the other types like the fully articulated ones which eliminate thrust pressures because they are restrained
RE: Anchor
Expansion joints should only be used inside stations where there is constant inspection and easy maintenance possibility AND there is expensive, critical equipment that cannot be protected any other way.
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus
RE: Anchor
I kind of realize expansion joints come in various shapes and forms and that the axial ones are not desirable. So I indeed relied first on natural flexibility as CRG mentioned. I calculated the required loop or offset and when this is not sufficient, I was wondering what the solution would be. Perhaps my use of terminology was wrong but what would be the difference between slip joints , expansion barrels and other expansion containing devices?
It would be nice if there was a kind of rough guide for spacing of anchors and guides but I realize this would be based on the forces one is willing to design and put up with on the anchors and guides