Carbon steel clamp pipe fittings for fire protection

The clamping type pipe fitting is a kind of connector that connects the pipe with a socket pipe fitting with a special sealing ring, and uses a special tool to compress the pipe mouth to seal and fix it. According to the end clamping connection method, it is divided into D type and S type. Two types. It has the characteristics of anti-pulling, anti-rotation, simple and convenient installation, small operating space required, earthquake resistance, and maintenance-free after installation.

Carbon steel clamping pipe fittings for fire protection - thin-walled carbon steel pipes

Nowadays, the wall thickness of pipes for water delivery or fire protection is generally 3 mm. Since it is a malleable steel threaded connection, threads need to be processed. Generally, the thread height of pipes below DN50 is 1.5mm. In other words, the remaining thickness of the steel pipe after processing the threads is 1.5mm. , at the construction site, after the malleable steel parts are screwed into the steel pipe, there will be a section of thread left on the pipe that has not been screwed in. This section of thread becomes the weak part of the pipeline system. Since there is no anti-corrosion layer, there is also a stress concentration problem. Construction workers Everyone has the experience that this part is easy to break, and the steel pipe with an overall wall thickness of 1.5mm does not have any parts that are not anti-corrosion, and there is no stress concentration defect. Therefore, the piping system connected by thin-walled carbon steel pipes uses steel pipes with a wall thickness of 1.5 The overall service life will not be lower than that of the piping system connected by Malle Steel.

What details should be paid attention to when installing clamping pipe fittings?

Crimping precautions and leakage analysis:

1. Precautions for crimping

Electric crimping tools should be operated strictly in accordance with the operating instructions.
When cutting pipes, make sure the end face of the cut is perpendicular to the axial direction of the pipe. The cut pipe should be deburred to prevent burrs from scratching the sealing ring.
Before inserting the pipe into the pipe fitting, it is necessary to check whether the fittings inside the pipe fitting are intact and the plug-in socket is in place and must not be skewed.
When crimping pipe systems of different diameters, use jaws and ring dies that are the same as the pipe diameters.
It is strictly prohibited to put wire on the inner and outer walls of the pipe.

2. Possible reasons for leakage

The sealing ring of the pipe fitting is scratched and damaged. For example, the cutting section of the pipe is not deburred or is not deburred well, and there is foreign matter in the pipe fitting.
The socket depth is not enough, and the pipe is not fully inserted into the pipe fitting step.
The outer coating of the pipe is damaged and the pipe is deformed due to being dragged or knocked during on-site transportation.
Failure to use the correct pipe materials and fittings when connecting pipe networks
Ring die or jaw clamping misalignment
Not using jaws or ring dies of the same diameter as the fitting
Use damaged and deformed jaws, ring dies, and scissor heads
The jaws and ring dies are not maintained according to regulations, causing rust and resistance in the jaws and ring dies, affecting the crimping effect.
The pipe network is not installed and fixed according to regulations. For example: the pipe network is not installed horizontally, and the bracket is U-shaped and fixed at the pipe fittings.

How fast is the construction of clamp pipe fittings?

Under normal circumstances, after a little training or working for two or three days, workers can master the installation skills and reach the speed of 50 sprinkler heads per day for two people. However, Malle Iron and Steel generally requires four people and 1.5 days to install 50 sprinkler heads. A sprinkler head also requires a skilled silk cutting and hemp wrapping master.

A general fire protection design requires about 1,000 sprinkler heads for a building area of 10,000 square meters. If the total building area and the number of workers are known, the construction period can be roughly calculated based on the above construction speed.

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