Grooved pipe connection is often used in the construction and installation of fire fighting pipes. Therefore, it is often necessary to groove fire fighting pipe. If the pipe cracks during grooving, it will be very annoying. Why does fire fighting pipe crack when grooving? The reasons mainly involve pipe material factors and human factors.
I. Material factors
Pipe material is the primary factor. If pipe cracks during grooving, firstly check pipes’ quality issue. Common quality issues that cause pipe cracking mainly include:
(1) The problems of welded pipe itself: the shrinkage stress of welded pipe is too high, uneven heated or unreasonable welding method and sequence will lead to weld cracking
(2) Insufficient pipe thickness: pipes' wall thickness is required when grooving, in general ,only the thickness meets the national standard, pipes can be grooved according to construction requirements. However, in order to save costs, some contractors use thin pipes instead of thick ones, which will cause some problems during grooving.
(3)Pipe is not straight: Pipes may collide during handling and long-distance transportation, resulting in pipe bending. When grooving bending pipe , cracks may occur on one side due to non-homogenous force stresses.
(4) Poor quality of pipes: Good raw materials are needed to produce high-quality galvanized pipes. However, in order to save costs, some manufacturers use wasted materials to make pipes, which will lead to relatively poor quality of pipes, low carbon content and easy to crack when making grooves.
Excluding the pipe material factor, the human factor is the most likely factor. There are many human factors, mainly including grooving force, grooving depth, grooving skills, etc.
1.Grooving force：After starting the roll grooving machine, the handle should be slowly shaken with even and moderate force, no brute force is allowed. Too fast feeding, or excessive force, will be easy to cause pipe cracking during grooving.
2.Grooving depth: The groove depth cannot be too shallow or too deep. If the groove is too shallow, the clamp cannot enter the groove sufficiently , itis easy to loosen; If the groove is too deep, it is easy to damage the galvanized layer, or make the groove broken.
3.Grooving skills: Although it seems easy to groove the pipe, certain experience and skills are also required, especially for thin and small pipes. Therefore, it is better to conduct detailed technical disclosure before construction.
In addition, in order to complete the pipe grooving with high efficiency and high quality, the brand roll grooving machine with quality guarante is preferred. Zhejiang Victaulic Tuwei Piping Equipment Co., Ltd. is a professional manufacturer of pipe tools，we have various models of roll grooving machine, pipe cutting machine, hole cutting machine, pipe threading machine for you to choose. If you have any needs or doubts about pipe tools, welcome to contact us.
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