Suitable pipeline elbow for caliper pigging operations
Suitable pipeline elbow for caliper pigging operations
(OP)
Dear all forum members
My company has a pipeline project of 16" pipe. we are going to change bend into elbow. we will use 90 and 45 elbow. please give me suggestion what is the minimum elbow radius which the caliper pig will be able to pass through?
Thank you
My company has a pipeline project of 16" pipe. we are going to change bend into elbow. we will use 90 and 45 elbow. please give me suggestion what is the minimum elbow radius which the caliper pig will be able to pass through?
Thank you





RE: Suitable pipeline elbow for caliper pigging operations
You are busy changing your PIPELINE into PIPING.
I don't know any instrumented pigs which are happy at less than 3D and most would prefer 5D.
Also you need to avoid multiple bends within certain distances, especially if they change orientation.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Suitable pipeline elbow for caliper pigging operations
RE: Suitable pipeline elbow for caliper pigging operations
"Also you need to avoid multiple bends within certain distances, especially if they change orientation."
I'm trying to understand what you mean by orientation. Is this equivalent to "Also you need to avoid multiple bends within certain distances, especially if they change planes."
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Suitable pipeline elbow for caliper pigging operations
RE: Suitable pipeline elbow for caliper pigging operations
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Suitable pipeline elbow for caliper pigging operations
RE: Suitable pipeline elbow for caliper pigging operations
Go for 3D Hot induction bends. not elbows in your case.
RE: Suitable pipeline elbow for caliper pigging operations
"Bend ha s a smoother curve such as 3D or 5D or more". Not following you there for a 3D hot bend/elbow. Both would perform the same.
3D elbow fittings may be purchased off the shelf and will likely cost you a lot less than any hot bend. They also have the advantage of a full hoop stress pressure rating, as opposed to de-rated hot bends which are typically only rated for 92% of their wall thickness due to the wall thinning that occurs during the hot bend process.
If your pig requires a minimum 5D radius or more, then obviously you'd need to go with hot bends.