No standard applies to vent pipes on cased pipelines. You can use the local structural steel design standard to design the vent pipe and the pipeline's casing pipe too. API 1102 only applies to pressure containing pipe, so the casing and vent are excluded.
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Jacketed pipe = larger diameter pipe that protects pipes of smaller diameter the same one that is of the transport process of crude, since it uses caps and collars of TDW "is used in crossings of asphalted vias", one must leave a vent between The jacket tube and the tube containing the process fluid.
Now that you learned what one is, learn how to eliminate using casings and vents. They have been on their way out for more than 25 years now. Stop using them. They are more dangerous than using no casing.
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Naw! But maybe. I can't read that dwg scale. If that 3 pipes true, something is very, very strange. But that makes for even more reason to stop using it.
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PREVIOUSLY, A 12 "PIPE FOR PROTECTION OF A FUTURE PIPE WAS REQUIRED TO USE A TUNER FOR THE SPECIAL CROSSING, HOWEVER, THANKS TO THE 12" PIPE EXISTING IT COULD AVOID THE WORK TO USE TUNER, NOW IN STOCK WE HAD NO TDW CAPS 12 "x 6" we only had 10 "x 6" caps, so in the diagram you can see that there is a double pipe to protect the 6 "pipe, it should be made clear that the only pipe that has fluid is the pipe. 6 ", the 10" and 12 "pipes only serve as protection, however to avoid corrosion and for possible accumulation of gases is designed venting!
That is the strangest crossing design I've ever seen.
You do realize that if, as shown, you weld the 10" pipe to the 6" pipe as shown then have differential temperatures and expansion you will generate some very big forces on the 6" pipe in particular.
You have no seals shown on the 10" to 12" pipe so this will just fill with water
The vents are not designed per se - there is virtually no flow and no pressure so just use some nice thick pipe to resist bending loads, say 2" sch 80?
That drain line you show won't work - there is no driving force to flow water uphill so it's purpose is unclear.
You don't need this 10" pipe to "protect" the outer one. why is it there?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
The pipes of 12 were placed under the asphalt so it served to cross the asphalt road there, is a piece of 12 "pipe 20 meters long, the pipe of 12 is not filled with water because it is buried, The 12 "pipe served to avoid an excavation in the existing road because according to the design the Pipeline must cross the asphalted road, in addition this pipe of 12 also serves to protect the 6" pipe from the stresses and loads generated by The weight of the landfill and the weight of the heavy traffic.
The 10 "pipe was placed as a protection of the 6" pipe because we did not have the caps of T.D. Williamson 12 "x6" only 10 "x 6", which seals the 6 "pipe, however a venting is performed for possible gases present in the 6" and 10 "pipe space, that venting does not serve For nothing else, it is a very common practice at intersections in my country due to the conditions of the terrain.
Attached is the catalog of the caps and collars of TD Williamson and the link:Link
Your country seems to be the only one doing such things, but why not if it works like you want. Casing inside casing seems like a lot of trouble for seemingly nothing much gained except for the potential shielding of your corrosion protection current.
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Here is an engineering guideline of the pipeline crossing with a casing pipe, which is conformed with the AREMA. It states that the vent pipes is to be 2 inches minimum and 4 ft above grade.
Nice, but they are not a pipeline company, nor are they specialist pipeline engineers.
Many that don't know better think that casings are the only way that these crossings should be installed, however the practice has been going out of favor for at least 35 years. Casings are not required by B31.4 or B31.8, only by railroads and other enemies of pipeines, so you know something isn't right.
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Nix the casing, increase burial depth and use heavier wall pipe at the crossing, this is the way it is done now for reasons BI alludes to, you will save the poor suckers in integrity and operations a lot of headaches and maintenance costs in the future.
