Handling Flattened Pipe Bends and the Rotational Molding Technique for Medium-Frequency Pipe Bends
During pipe bend construction, it's crucial to avoid having pipes stacked together under heavy loads, as even high-quality pipes require protection. However, in case pipes become flattened due to such stacking, here's what you can do:
1. After creating pipe bends, they are typically regular and often, to save space, large-diameter pipes are placed at the bottom, with smaller-diameter pipes added layer by layer. When the stack height doesn't exceed 2.5 meters, this doesn't damage the pipes or cause flattening. However, if smaller-diameter pipes are placed layer by layer inside larger-diameter pipes, the bottom pipe experiences significant pressure, causing deformation and flattening. This is usually not due to the quality of the pipes but results from improper storage and transportation methods. In most cases, pipe flattening occurs during storage and transportation.
2. Usually, after a pipe bend is flattened, it needs to be assessed and tested to determine the severity of deformation and whether it affects usability. If the pipe has no issues, it can be rectified using a circular corrector, which is more convenient and precise. If a corrector is unavailable, tapping the pipe to restore its original shape may be an emergency measure, but it's not advisable.
Preventing pipe bends from being flattened is essential. Instead of relying on their structural strength to bear heavy loads, proper handling and maintenance should be employed to ensure longevity and avoid flattening.
Rotational Molding Technique for Medium-Frequency Pipe Bends
Ordinarily, pipes are initially produced in a straight form, and medium-frequency pipe bends are manufactured by processing straight pipes. Almost all pipe bend components undergo processing. To enhance construction efficiency and expand the areas of use for these pipes, knowledge of rotational molding techniques is necessary. Here are some key points regarding this technique:
1. Medium-frequency pipe bends are typically manufactured using materials in powdered form, known for their good flowability, environmental stress cracking resistance, toughness, wear resistance, and weather resistance. Pipes produced through this process exhibit good environmental stress cracking resistance, toughness, wear resistance, and weather resistance.
2. Rotational molding for medium-frequency pipe bends creates higher impact strength and warpage. It involves melting and flowing the material during thermal cycling, with a melt index ranging from 3 to 8. Generally, PE and cross-linked polyethylene are used for rotational molding of pipes, employing a medium to wide MWD grade. Post-processing, like in typical blow molding processes, is not required.
Production and processing of medium-frequency pipe bends incorporate various techniques. As the quality of pipelines continues to improve and technologies advance, these processes will become more mature, contributing to the overall quality of pipes. Rotational molding techniques are highly practical in pipe production.
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