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piping loop
- shishirmtech
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10 years 7 months ago - 10 years 7 months ago #8348 by shishirmtech
piping loop was created by shishirmtech
How to calculate and decide loop length? If a question is asked to any layout person, what answer would be given? Please explain with simple example. Suppose we have 200 ft length
Pipe on the rack. So where do we provide the loop and how to calculate???
Pipe on the rack. So where do we provide the loop and how to calculate???
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- Jop
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10 years 7 months ago - 10 years 7 months ago #6906 by Jop
Do it once and Do it Right
Replied by Jop on topic Re: piping loop
Below is the answer to a similar question asked 4 years ago. Do a search on this web site using "Loop" as the key word and you will see other information.
Now, the question is not how much pipe should you have between expansion loops but what size an expansion loop should be for a given distance between anchor points of a line.
The answer to this question is really simpler than would first appear. Let’s say you are doing layout for a “Unit†which branches (west) off the main north/south offsite interconnection pipeway. The line under consideration is a medium pressure steam line with 8†schedule 40 pipes and a temperature of 450 degrees F. There are battery limits block valves at the interconnecting pipeway end and the line dead-ends at the other end of the unit.
Your pipeway (or sleeper way) has a specific spacing and width. We will use 10 pipe supports at a spacing of 25 feet each and a width of 25 feet. Number the supports from right to left as PS #1 through PS # 10. You know you need one or more loops. You also know that the loops need to be supported. You also recognize that you can use option 1 (above) for some of the header. So, start out by placing your first anchor two pipe supports in from the dead-end of the unit at PS # 8. You will let the last 55 feet (+/-) of header to “free expand.†Next move to the battery limits end of the pipeway and place an anchor at PS #1 nearest to the battery limits block valve.
Now look at the distance between the two anchors. Is this distance less than 200 feet? If it is less then you should need only one loop. This loop should be as near to the halfway point between the two anchors as practical. Our distance between PS #1 and PS # 8 is 175 feet. The halfway point is between PS # 4 and PS # 5.
The line will run in the first pipeway berth at the far south side of the unit pipeway. The loop will rest on a support beam on the north side of the unit pipeway and cantilever out about 5 to 6 feet. This makes the loop with dimensions as follows: a vertical rise up 2’ – 6â€, a leg north of 23 feet, a flat turn and a leg west of 20’ – 0â€, then a flat turn south of 23 feet and a vertical drop of 2’ – 6†back into the lines assigned berth.
You have already placed an anchor at PS # 1 and at PS # 8 so the next thing is to place guides. The guides need to be one pipe support away from the loop. So the guides are placed at PS # 3 and PS # 6.
This is what I mean by being simpler than would first appear. 90% of the time you can use the “natural landscape†to help to do the loop design instead if worrying about a lot of calculations.
Please note: this being a steam system it will still need to have a proper check and/or analysis by a qualified Pipe Stress Engineer.
Now, the question is not how much pipe should you have between expansion loops but what size an expansion loop should be for a given distance between anchor points of a line.
The answer to this question is really simpler than would first appear. Let’s say you are doing layout for a “Unit†which branches (west) off the main north/south offsite interconnection pipeway. The line under consideration is a medium pressure steam line with 8†schedule 40 pipes and a temperature of 450 degrees F. There are battery limits block valves at the interconnecting pipeway end and the line dead-ends at the other end of the unit.
Your pipeway (or sleeper way) has a specific spacing and width. We will use 10 pipe supports at a spacing of 25 feet each and a width of 25 feet. Number the supports from right to left as PS #1 through PS # 10. You know you need one or more loops. You also know that the loops need to be supported. You also recognize that you can use option 1 (above) for some of the header. So, start out by placing your first anchor two pipe supports in from the dead-end of the unit at PS # 8. You will let the last 55 feet (+/-) of header to “free expand.†Next move to the battery limits end of the pipeway and place an anchor at PS #1 nearest to the battery limits block valve.
Now look at the distance between the two anchors. Is this distance less than 200 feet? If it is less then you should need only one loop. This loop should be as near to the halfway point between the two anchors as practical. Our distance between PS #1 and PS # 8 is 175 feet. The halfway point is between PS # 4 and PS # 5.
The line will run in the first pipeway berth at the far south side of the unit pipeway. The loop will rest on a support beam on the north side of the unit pipeway and cantilever out about 5 to 6 feet. This makes the loop with dimensions as follows: a vertical rise up 2’ – 6â€, a leg north of 23 feet, a flat turn and a leg west of 20’ – 0â€, then a flat turn south of 23 feet and a vertical drop of 2’ – 6†back into the lines assigned berth.
You have already placed an anchor at PS # 1 and at PS # 8 so the next thing is to place guides. The guides need to be one pipe support away from the loop. So the guides are placed at PS # 3 and PS # 6.
This is what I mean by being simpler than would first appear. 90% of the time you can use the “natural landscape†to help to do the loop design instead if worrying about a lot of calculations.
Please note: this being a steam system it will still need to have a proper check and/or analysis by a qualified Pipe Stress Engineer.
Do it once and Do it Right
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