When ordering the equipment, is it required to have matching flanges? What are the advantages and disadvantages of having them or not?
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When ordering the equipment, is it required to have matching flanges? What are the advantages and disadvantages of having them or not?
Advantages of using it: 1. Saves money, as there is no need to purchase flange bolts, gaskets, etc； Disadvantages: 1. The quality of the flange is uncontrollable. Advantages: 1. The quality of the flange is controllable, and the wall thickness remains consistent when welding it directly to the pipe. Disadvantages: 1. It costs more money
How can the quality of those with mating flanges be uncontrollable? The flange class only needs to be the same as another corresponding class; it has nothing to do with the pipeline
Flanges may seem simple, but their processing has specific requirements. It’s fine for low-pressure applications, but for high-pressure flanges, chamfering is required; some companies fail to carry out this step. You haven’t experienced the safety hazards that can arise when flanges aren’t chamfered as required – cracks can form, and since the pipeline contains high-pressure hydrogen, it’s fortunate that the issue was detected in time; otherwise, the consequences could have been severe
Furthermore, what if the material is different from that of the pipeline? As for welding of dissimilar steels, it is best to avoid such welding in engineering practice. In current turnkey projects carried out by design firms, pump manufacturers are no longer required to provide matching flanges
What the first floor considers to be cost savings, I believe, results in additional costs in the end; it’s not possible to truly save money. After all, the addition of matching flanges incurs expenses, and those costs must be borne by the owners. As for the advantages, I think it helps avoid difficulties in construction that can arise when the flanges on the equipment don’t match those on the pipes. If the standards and specifications for the flanges are established in advance, there are generally no problems
Agree with that, unless one’s own procurement department wants to get involved. . .
It's better to have it, but if not, you need to get one by yourself
The key is to establish clear standards; the flanges produced by equipment manufacturers should generally be made from a material that is consistent with the main material of the equipment’s pipes. If the material of the process pipes is the same as well, there should be no problems. If the installation company is responsible for the installation work, it is advisable to purchase flanges uniformly, as this reduces costs and makes it easier to ensure consistent quality.
For large-diameter pumps, those with a diameter of 300 mm or more, the pump outlet flange may be non-standard, in which case matching flanges are required. For diameters of 300 or less, paired flanges are not required.