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field weld
- sanasa
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16 years 10 months ago - 16 years 10 months ago #8676 by sanasa 
Hi, Iam worked for almost 12 years in design office of two three companies. During my this design experience I have not got any change to have construction experience. Becoz of this I have same lack of knowledge regarding field weld and fit field weld.
generaly we mark field weld and fit field weld on isometric while doing IFC considering container size 40'x8'x8' for size 2" and above and for below 1 .5" we follow 20'x8'x8'.
Still I am not confirm with what we marked.
Can somebody focus on this more like same thumb rule.
field weld was created by sanasa
generaly we mark field weld and fit field weld on isometric while doing IFC considering container size 40'x8'x8' for size 2" and above and for below 1 .5" we follow 20'x8'x8'.
Still I am not confirm with what we marked.
Can somebody focus on this more like same thumb rule.
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- Jop
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16 years 10 months ago - 16 years 10 months ago #4045 by Jop
Do it once and Do it Right
Replied by Jop on topic Field welds
Based on what you described, you are doing it (field welds and fit field welds) just right.
I am not sure what your question is.
Are you asking about the "box" sizes you listed?
or
Are you asking why are there field welds and fit field welds?
The box sizes are determined by a number of reasons:
1. Shipping size. The 8' x 8' x 40' is the largest size normally allowed for over the highway truck that would carry prefabricated piping.
2. The 8' x 8' x 40' results in maximizing the number of less expensive shop welds and reduces the number of more expensive field welds
3. The 8' x 8' x 40' for the larger size piping is because larger piping is more stable for lifting without bending when handled during a crane lift for installation.
4. The 8' x 8' x 20' for the smaller size piping is because the small piping is less stable for lifting and prone to bending when handled during a crane lift for installation.
Why are there Field welds (FW) and why are there fit field welds (FFW)
FW = Piping is normally prefabricated in a pipe fabrication shop that is remote from the job site. Remote is a relative term, the shop may be located 10 miles or 10,000 miles away. The FW is a standard weld to be made in the field for the purpose of installation no extra pipe is included by the shop. The FW's in a given line may be made in any order. The piping designer who creates the isometric is the person who is best able to decide the best location or place to have a field weld.
FFW = The Fit Field Weld (sometimes called Final Fit Weld) is intended to be the last weld made in the installation of a long or complex line where there is the possibility for a dimensional misfit. For this purpose, normally the shop in instructed to leave 6'' to 9" extra pipe on one side of the FFW.
I am not sure what your question is.
Are you asking about the "box" sizes you listed?
or
Are you asking why are there field welds and fit field welds?
The box sizes are determined by a number of reasons:
1. Shipping size. The 8' x 8' x 40' is the largest size normally allowed for over the highway truck that would carry prefabricated piping.
2. The 8' x 8' x 40' results in maximizing the number of less expensive shop welds and reduces the number of more expensive field welds
3. The 8' x 8' x 40' for the larger size piping is because larger piping is more stable for lifting without bending when handled during a crane lift for installation.
4. The 8' x 8' x 20' for the smaller size piping is because the small piping is less stable for lifting and prone to bending when handled during a crane lift for installation.
Why are there Field welds (FW) and why are there fit field welds (FFW)
FW = Piping is normally prefabricated in a pipe fabrication shop that is remote from the job site. Remote is a relative term, the shop may be located 10 miles or 10,000 miles away. The FW is a standard weld to be made in the field for the purpose of installation no extra pipe is included by the shop. The FW's in a given line may be made in any order. The piping designer who creates the isometric is the person who is best able to decide the best location or place to have a field weld.
FFW = The Fit Field Weld (sometimes called Final Fit Weld) is intended to be the last weld made in the installation of a long or complex line where there is the possibility for a dimensional misfit. For this purpose, normally the shop in instructed to leave 6'' to 9" extra pipe on one side of the FFW.
Do it once and Do it Right
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- sanasa
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16 years 10 months ago - 16 years 10 months ago #4047 by sanasa
Replied by sanasa on topic Thank You Jop, I understand about
Thank You Jop,
I understand about Field Weld and Fit field weld,
But sir this doubt rise in mind when one of my superior told me to have defult FW when any size pipe having platform penetration to ease off construction. is it ok.
In view of this I have one doubt,
1) whether grating or chequred plate use maximum for platform.
2) whether piping installed first , then this gatings or chequred plate.
3) where grating or chequred plate installed first tehn piping , if third option is ok then my superior might be right,
Please share your experience.
I understand about Field Weld and Fit field weld,
But sir this doubt rise in mind when one of my superior told me to have defult FW when any size pipe having platform penetration to ease off construction. is it ok.
In view of this I have one doubt,
1) whether grating or chequred plate use maximum for platform.
2) whether piping installed first , then this gatings or chequred plate.
3) where grating or chequred plate installed first tehn piping , if third option is ok then my superior might be right,
Please share your experience.
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16 years 10 months ago - 16 years 10 months ago #4048 by Jop
Do it once and Do it Right
Replied by Jop on topic Field welds
Let's try this.
Go and ask the structural department how they will make the platforms when there is a pipe penatration:
- split for removal and installation?
or
- fixed and not removable?
I think they will say split for removal and installation.
With this in mind I do not recommend a (default) field weld at every platform penatration. It would be unneccessary and would add extra cost to the project.
Go and ask the structural department how they will make the platforms when there is a pipe penatration:
- split for removal and installation?
or
- fixed and not removable?
I think they will say split for removal and installation.
With this in mind I do not recommend a (default) field weld at every platform penatration. It would be unneccessary and would add extra cost to the project.
Do it once and Do it Right
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- sanasa
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16 years 10 months ago - 16 years 10 months ago #4049 by sanasa
Replied by sanasa on topic Thank You, JOP
Thank You, JOP
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- 11echo
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16 years 10 months ago - 16 years 10 months ago #4052 by 11echo
Replied by 11echo on topic There is another aspect of
There is another aspect of Field Welds I'd like to bring up. I work in the field all the time, we normally try to get most of our pipe spools welded up in the shop ...where quality control is much simpler. However there are times when it is next to impossible to get the as-built dimension data, so I have to have "extra" on the lengths for the welders out in the field to do the final fit up. At these places I give my best "guess" as to the correct dimension, and call out to "Field Verify" and to do a field weld. This weld is called the field fit-up weld (FFW) for us here.
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