Epoxy-coated gas pipes tend to be curved in length

You can’t have the same thick walls everywhere, and there are objectively signs of unequal wall thickness in your cross-sections and in your longitudinal tubes. In order to control this unevenness, the allowable target of wall thickness unevenness is regulated in some ms pipe specifications. The general rule of coated plastic steel pipe does not exceed 80% of the wall thickness of the public service (implemented after consultation between the supply and demand sides). In the cross section of plastic coated steel tube, there is a sign of unequal outside diameter, that is, there is a difference between the maximum and minimum outside diameter perpendicular to each other, then the difference between the maximum outside diameter and the minimum outside diameter is ellipticity (or unroundness). In order to control the ellipticity, some steel pipe specifications have the allowable goal of ellipticity, and the general rule is not to exceed 80% of the outer diameter of the service (after consultation between the supply and demand sides). Coated plastic steel pipe in the length of the curve, with a number of its curve that is called bending. The regular bending in the code is generally divided into the following two types: partial bending: measure the maximum bending of the steel pipe with a one-meter ruler, the chord height (mm), PE coated steel pipe is the partial bending value, the unit is mm/m, and the schematic method is 2.5mm/m. This method is also applicable to pipe end bending. The steel-plastic composite pressure pipe is usually referred to. The intermediate layer of this kind of FBE coated pipe is the steel belt layer formed by crimping forming butt welding of high carbon steel belt. The inner and outer layers are high density polyethylene (HDPE). The middle layer of this kind of pipe is steel belt, so the bearing capacity of the pipe is very good. Different from the aluminum belt, the bearing capacity is not high. The maximum diameter of the pipe can only be 63mm, and the maximum diameter of the steel-plastic pipe can be 200mm, or even larger. Because the steel belt of tube material interlayer is airtight, so pipe of besmear model steel has effect of oxygen resistance at the same time so this kind of steel model pipe is used at drinking water project directly, and its inside and outer layer is plastic material, have very good anticorrosive.

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