What are the requirements when grooving galvanized steel pipes? How to groove galvanized steel pipe?



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Galvanized steel pipe is a kind of pipe based on welded pipe and plated with a layer of zinc to prevent rust and corrosion, which is widely used in water supply and drainage, gas, steam and others. Today, let‘s talk about how to groove galvanized steel pipe.

1. Quality requirements for galvanized steel pipes


Since the grooved fittings are engaged with the outer wall of the pipe, the deviation of the pipe OD will make the pipe and the coupling unmatched, which will cause water leaking . In addition, unqualified material, unstable galvanized layer, insufficient wall thickness, may cause pipe broken, the zinc coating falling off or the high-frequency weld cracking, which eventually leads to water seepage or fracture of the joint. Therefore, it is very important to strictly control the quality of pipes.



2.Grooving requirements for galvanized steel pipes 


(1)Smooth surface, flat pipe end 

(2)The center of the groove is concentric with the pipe wall, and the width and depth of the groove meet the requirements. 

(3)Grooving should not damage the galvanized layer of the pipe.

3.How to groove galvanized steel pipe

(1)Check the workpiece: Cut the pipe to the required length with pipe cutting machine , the pipe end should be flat without burrs, and the welded pipes inner weld should be smoothed; 

(2)Inspect the equipment: Check whether the power supply meets the requirements to prevent motor from damage. Check whether the hydraulic oil is sufficient, notice the machine will not work properly if there is not enough oil inside.



(3) Place the pipe: Put one end of the pipe on the lower roll of the machine, and the other end on the pipe support, the pipe support should be placed at 2/3 of the total length of the pipe. then adjust the height of pipe support to horizontal or 1 degree lower.

(4)Adjust groove depth: Tighten the relief valve, shake the oil pump handle, make the upper roller downward and touch the pipe surface. Then turn the limit nut down, let it contact the oil pump surface, check the groove depth on the nameplate table, and rotate limit nut to the appropriate scale, then fix it with fastening nut.

(5)Grooving operation: Plug the power, start the roll grooving machine, and slowly shake the handle of the oil pump to start grooving. When the limit nut contacts the oil pump surface, allow the pipe to rotate additional one or two turns to make sure groove is completed, then turn off the switch.

(6)Measure groove depth: Release the relief valve, remove the pipe, and measure the groove depth with a PI ruler.

Grooving galvanized steel pipe, not only need to master the correct grooving method, but also should use a good grooving machine. Victualic-Tuwei company has been deeply involved in the pipe tools industry.  Roll grooving machines, pipe cutting machines, hole cutting machines, pipe threading machines and other products developed by Victaulic-Tuwei receive a good reputation because of its high quality and good performance. If you have any pipe tools needs or doubts, welcome to contact us at any time.


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