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Problems needing attention in the installation of grooved pipe fittings

2023-12-11


Groove pipe fittings using groove type pipe joint connection in various types of construction installation gradually popular, its fast and reliable characteristics of the installation industry colleagues recognized, Shanxi groove pipe fittings in fire engineering construction has also been widely used.

Groove pipe fittings using groove type pipe joint connection in various types of construction installation gradually popular, its fast and reliable characteristics of the installation industry colleagues recognized, Shanxi groove pipe fittings in fire engineering construction has also been widely used. However, what problems should be paid attention to when connecting rigid clamps and flexible clamps with different connection methods are not introduced much in the existing design and construction standards. Many provisions of clamp industry standards published in China's existing product standards are also related to manufacturing standards. So, let's learn about the problems that should be paid attention to when installing Shanxi grooved pipe fittings!

In the actual construction, the problems encountered in the connection of Shanxi groove pipe fittings with splints and their solutions are put forward.

Install the 1. rigid clamp on the DN250 pipeline according to the product manual provided by the manufacturer. Generally, satisfactory results can be obtained.

Please note the following installation details when 2. to make flexible clamp connections to DN300 lines.

1. Quality of Shanxi trench pipe fittings:

The outer diameter of Shanxi groove pipe fittings, the uniformity of wall thickness, and the roundness tolerance of pipe openings at both ends of the pipe shall not exceed the national standards. When loading and unloading steel pipes, please avoid nozzle deformation.

2. Measurement and appearance inspection before nozzle pressure groove:

Before applying pressure to the nozzle, please check whether the end face of the nozzle is perpendicular to the center line of the pipe, whether the tolerance of the nozzle fillet exceeds the standard, and whether the burrs around the nozzle have been removed and polished. For example, if the roundness of the nozzle exceeds the standard or is deformed, it must be cut off.

3. Stamping processing of Shanxi groove pipe fittings:

For long steel pipe pressure groove, in order to reduce the rotational fluctuation of the pipeline when pressing the groove, it is necessary to set the bracket, and install the ball bearing support point on the bracket. Strict pressure groove depth, pressure groove depth must meet the requirements of the product manufacturer instructions. During operation, pay attention to the speed at which the groove depth gradually reaches, and the mold that exceeds the service life must be replaced in time. After pushing the tank, remove the stripped galvanized thin skin from the nozzle and carry out anti-corrosion treatment. When handling, lifting, loading and unloading the pipeline of the completed tank, please pay attention to protect the nozzle groove from deformation.

4. Appearance quality of Shanxi groove pipe fittings:

Since the large-diameter steel strip is manufactured by ball mill cast iron sand mold, the manufacturing accuracy is affected by various factors. Therefore, a sampling inspection of the appearance is carried out, and the inspection contents include the following items.

4.1 the flexible band is rolled into a flat plate with a diameter that is too large or too small is unacceptable. Usually, when the inner diameter of the two belts and the outer diameter of the steel pipe are set, the gap between the two belts is about 2mm, and the roundness must not exceed the standard. Otherwise, please trim before wearing.

4.2 The flange height and thickness of each clamp in the pressure groove must meet the manufacturer's enterprise standards.

4.3 the radial deformation of each clamp must not exceed the standard.

5. Precautions for installation of Shanxi groove pipe clamp:

5.1 splint installation, especially flexible splint installation quality is good or bad, in addition to depending on the above points, according to the pipe material, dimensions, nozzle deformation size, pressure groove quality and splint itself quality, size of the size of the difference.

5.2 Please pay attention when installing large-diameter flexible belts above dn300.

5.2.1 Material and appearance inspection of rubber pad:

Each manufacturer's rubber pad according to the use of different media, manufacturing materials and formulations are also different, the installation unit should be to the production unit for the same product quality commitment and rubber pad physical and mechanical performance test report. The appearance inspection shall be free of damage and deformation, and the rubber sealing surface shall be free of bubbles, impurities, cracks and uneven defects.

5.2.2 Installation of Shanxi Groove Pipe Fitting Groove Pipe:

a. Touch the groove and hole by hand, or observe with eyes for 1 week, leaving no burr, damage or crack. In addition, remove the dirt around the nozzle.

B. After applying lubricant around the rubber pad, hook both ends of the steel pipe with your hands. At this point, make sure that the tension applied around the rubber seal is approximately the same.

c. Two grooved pipes shall be set, and the bolts shall be tightened symmetrically on both sides to make the gap between the grooves basically equal. When it is still not sufficiently tight with the rubber pad after being fastened, push the grooved tube with both hands to make the whole tube contact with the filler evenly at first, observe that each piece of the grooved tube enters the groove, and tighten the bolts symmetrically and successively. When tightening, if there are wrinkled protrusions on the packing, replace the packing.

5.2.3 After the flange of the grooved pipeline is stuck in the groove, the bolts shall be fastened symmetrically on both sides. The "snap edge" refers to a protrusion of about 2mm on the flange of the groove pipe with the same height as the depth of the pipe groove, which is flush with the concave insert appearing after pressing the nozzle groove. The flange of the finished belt may be too thick, too deformed, and the plane may be too distorted. If it can be repaired on site, repair it; if it cannot be repaired, throw it away and install it again. Therefore, the on-site staff need to observe and inspect one by one, and can reinstall after basically meeting the requirements to avoid rework.

5.2.4 When Shanxi groove pipe fittings adopt imported groove pipe fittings and domestic pipe fittings, it is necessary to know in advance what standards the products adopted by various manufacturers follow, and pipe fittings matching with groove pipe fittings must be adopted. Otherwise, due to different standards, a large area of pressure test is prone to fail, resulting in great losses.

Key words:

Masteel

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