【Haichuan Pipeline Construction】Are the large and small ends of water pipes fabricated on-site, which results in higher or lower costs?
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Is this cheaper or does it cost more?
It must be cheaper to produce it on-site. But if there is certain pressure, it is not allowed to do so. However, if the diameter of the variable size is too large, it may not be available on the market, unless special processing is done. For such situations, it is best to consult the design firm and obtain written approval to avoid future problems. For reference.
It doesn’t seem cheap, unless your welders and plumbers are idle – after all, salaries still need to be paid, and you have a roll forming machine
When working with materials of such large diameter and thickness, there must be roll formers and hydraulic forming machines on site, right?:) Otherwise, if special materials are to be prepared for this purpose, they are either custom-made or not available in the market. So there’s no comparison:)
Don’t be fooled by those 30-inch sizes; the manufacturing costs on-site could be several thousand
The requirements for water pipes are not high, so it’s cost-effective to handle it yourself on site. With these three joints requiring 500 each, a welder who works at 350 per day cannot complete the work in one day; it is necessary to assign a plumber and an assistant for half a day as well. The cost of working on these three custom-made fittings amounts to 1200, which is significantly less than the cost of purchasing them externally. (Major outsourced items require consideration of the procurement cycle)
First, the cost of materials is not taken into account; of course, used materials are available at no cost. Second, the time required to cut these three different-sized fittings is not considered, and this task alone can take up half a day. Third, the time needed to roll these fittings into the desired shape, as well as the associated machinery costs, are not taken into account. Fourth, the time required for welding the longitudinal seams on the fittings themselves, along with the efficiency associated with that process, is not considered
The original poster has thought very carefully; impressive. Do we also need to take into account the time lost in case the rolling machine breaks down, as well as the time wasted dealing with defective welds?:lol,,,,
Abnormal factors can be ignored; on-site production is used only when items cannot be ordered or when time is insufficient
First of all, such a situation must have prerequisites; otherwise, a general discussion is meaningless. The prerequisites are: the operating conditions permit it, the manufacturing process permits it (given the on-site conditions), the quantity is acceptable (not too large), and the process performance is satisfactory (in terms of pressure loss, erosion, corrosion), ... These refer only to elbow fittings; it’s quite common to manufacture bends on-site (commonly known as “shrimp waists”). What managers focus on is finding the balance among factors such as cost, efficiency, and quality, rather than emphasizing any one of them in isolation.
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