Construction of pipelines, Pipe waste.
Construction of pipelines, Pipe waste.
(OP)
Engineers
Morning.
How much is pipe lost in the construccion of pipelines to estimate waste of pipe?
We are estimating 1.5 % for prefabrication and 1 % for pipeline construccion.
Thanks
hfpolo
Morning.
How much is pipe lost in the construccion of pipelines to estimate waste of pipe?
We are estimating 1.5 % for prefabrication and 1 % for pipeline construccion.
Thanks
hfpolo





RE: Construction of pipelines, Pipe waste.
You need to give us more information, such as the length of the pipeline, the size of the pipe and the material.
- There is a big difference between 2.5% of 500 feet and 2.5% of 500 miles when considering the amount of stock needed for welder qualification, damage during installation, etc.
- There is a big difference between the potential for wastage between the short pipeline and the very long pipeline.
- There is a big difference in damage and pilferage depending on where the project is located.
prognosis: Lead or Lag
RE: Construction of pipelines, Pipe waste.
Fabrications tend to be a bit fussier about lengths and stuff. I did a job last year to build 4 launchers/receivers. The throat section needed to be about 1/4 the length of a joint of pipe, more or less. So I called out 1/4 joint on the drawings. I had a great fabricator the took that to mean that he needed to cut the double random joint into 4 equal pieces--zero waste. By not being very fussy about things that don't matter, my waste on that project was much less than your 1%. I've worked for companies that act like they are building a precision instrument on pipeline fabrications and specified everything to the 1/8 inch, and had their inspector verify every measurement. Waste on those sorts of projects is probably closer to 5%.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Construction of pipelines, Pipe waste.
I deliver more information about project:
Pipe of pipeline, 16 inches, sch - std carbon stell, 12 miles. In cross country
pipe of prefabricaction 16 inches, sch - std, carbon stell, 2.81 miles. in cluster.
what standard or rule of thumb should be applied?
hfpolo
RE: Construction of pipelines, Pipe waste.
For the fabrication you really have to ask how fussy you are going to be in the design. Are you going to pay welders to build up pups into useful lengths? How close are you going to hold the fabricator to his labor estimate (if you had doing this as hard dollar, then he's not going to want to waste time looking for the right length pup)? Is the fabricator going to acquire the materials as part of his bit? Are your dimensions exact or "more or less"? All of those things have a big impact on waste.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Construction of pipelines, Pipe waste.
RE: Construction of pipelines, Pipe waste.
The 48”-diameter pipeline will comprise line pipe formed of continuously welded, high-grade API 5L Grade X70 carbon steel with an outside diameter of 48 inches (1219mm) and a nominal 16.7mm wall thickness where the route crosses agricultural land.
The wall thickness of the pipe is determined by operating pressure considerations while applying the specified 0.72 design factor. In areas of particular environmental or social risk, where an increase safety factor applies, the wall thickness will increase from 16.7mm for a design factor of 0.72 to 20.1mm for a design factor of 0.6, and increasing up to a maximum of 24.1mm for a design factor of 0.5.
20 tonnes waste metal from construction is estimated.
http://www.bpgeorgia.ge/external/content/document/...
Pipe weight 509.15kg/m. Total pipe weight = 450km * 509.15kg/m = 229,119 tonnes of pipe.
For this example, the amount of waste metal is nil, substantially less than .01%.
The answer to your question depends on the length of pipeline, diameter, contractor quality, weather, speed of project construction, availability of materials, project location, etc.
RE: Construction of pipelines, Pipe waste.
Bimr - if you think the 20 tonnes is pipe I think you're incorrect. Extra pipe becomes "spare pipe" stored for future repairs and replacements, not "waste"....
zdas04 - I hate to be picky, but there's something wrong with your maths on the 50 mile pipe example - it's a lot more than 880 joints. My estimate is about 6400. I totally agree with the theory though
As for fabrications - harder to judge without seeing the total lengths and what lengths they are cut in - however you say pre-fabrication? do you mean river crossings etc? Should be no waste on those as you tie-into them when they're installed
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Construction of pipelines, Pipe waste.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Construction of pipelines, Pipe waste.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Construction of pipelines, Pipe waste.
SRL, single random lengths, 18' to 25', 5% of order can be supplied at 16-18' lengths seldom exceed 22'
DRL, double random lengths, usually 38'-40', but can go to 44'
Learn from the mistakes of others. You don't have time to make them all yourself.
RE: Construction of pipelines, Pipe waste.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Construction of pipelines, Pipe waste.