What is the proportion of pipes of different lengths?
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For the project renovation, a batch of steel-lined pipes is required, with a total length of around 500 meters and approximately 30 bends. I would like to ask for your advice on what proportion of pipes should be of lengths of 100 mm, 200 mm, 500 mm, and other different sizes To ensure the smooth progress of piping work, are there any relevant empirical data? I would appreciate your advice.
Estimating it out of thin air seems unlikely. I think it’s possible to proceed with normal piping first, and then, based on the lengths of the straight sections, as well as the quantities of elbows, tees, reducers, valves, etc. indicated in the drawings, consider both the maximum and minimum lengths required for manufacturing the lined straight pipes, along with the flange connections for the lined fittings. This calculation cannot be 100% accurate; it’s best to confirm everything with the supplier before making a purchase, by sending them the drawings in advance. The installation of many lined pipes is carried out by the suppliers themselves.
The diagram should be drawn first, focusing on the overall length, with only individual parts requiring adjustments to that length.
We plan to use 4-meter pipes for the main pipelines, accounting for about 70% of the total length. What should be the distribution for the remaining 30%, for example, 10% for 2-meter pipes and 5% for 1-meter pipes – are there any approximate proportions?
Yes, the length of each pipeline is generally known. During actual construction, it is necessary to use short connectors to adjust the length due to the need to avoid existing pipelines, valves, etc. I’m wondering how many short connectors of different lengths are required
I actually drew this type of piping diagram 20 years ago; the required special lengths were specified in the diagram and calculated based on it.
Can’t it be cut on-site? Why must a length be fixed?
For lining, it is usually done by the manufacturer, with all connections made using flanges on site.
In our place, it’s absolutely not allowed to make random guesses based on experience; otherwise, you’ll get scolded by the boss. If the details on the drawings are unclear, it is necessary to go to the site for measurements; otherwise, too much material will be purchased and end up unused, while too little material will cause delays in the project timeline.
Then why can’t steel pipes be pre-connected on site and then the pipelines taken outside for plastic lining?
Since such a complicated process is involved, why not first complete the design drawings and hand them over to the lining manufacturer to carry out the remaining work? Generally, manufacturers will carry out a secondary design.