Cement Mortar Lined Anti-corrosion Steel Pipe

 

Cement mortar lined anti-corrosion steel pipes refer to steel pipes with an internal lining of cement mortar for anti-corrosion and wear resistance. Due to the concrete filling inside the steel pipes, they can absorb a significant amount of heat energy. Therefore, in the event of a fire, the temperature distribution across the pipe column section becomes very uneven, increasing the fire resistance time of the column and slowing down the heating rate of the steel column. Additionally, once the steel column yields, the concrete can bear most of the axial load, preventing structural collapse.

Cement Mortar Lined Anti-corrosion Steel Pipe Specification

Type	Concrete Coated Pipe, Concrete Weight Coating
Application	Used for natural gas, petroleum, water & sewage, and pipe systems
OD	219mm~2020mm
WT	5mm~25mm
Length	4mtr, 6mtr, 12mtr, 18mtr, 21mtr
Coating Standard	DIN 30670, DIN 30671, DIN 30678, SY/T0413-2002 etc.
End	Plain End/Bevelled End, Burr Removed
Packing	Waterproof Paper wrapped, Steel Strips bundled, two tags on each bundle

Cement Mortar Lined Anti-corrosion Steel Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Preparation Method of Cement Mortar Lined Anti-corrosion Steel Pipes

The metal pipe requiring lining is placed on a centrifugal device and rotated at high speed. Utilizing centrifugal force, the cement mortar poured into the pipe is evenly lined on the inner wall.

1. Materials and Proportions:
Use slag Portland cement of grade 500 or above (with 30% slag) and construction yellow sand (sieved with a 12-14 mesh/in screen, with minimal mud and impurities). The mixing ratio is as follows: cement:sand:water = 1:1.5:(0.33-0.4) by mass.

2. Centrifugal Speed and Time:
The higher the centrifugal speed, the denser the lining. Generally, a linear speed of 1000 m/min is required. For pipes with an inner diameter greater than 400 mm, a linear speed of 900 m/min results in good lining quality. For pipes with an inner diameter of 75-300 mm, a linear speed of only 370 m/min is achieved, leading to less than ideal lining quality. If the speed is increased further, the pipe will jump, necessitating improvements to the rotational tooling.

Centrifugal time:
- For pipes with an inner diameter of 75-300 mm, about 1 minute.
- For pipes with an inner diameter of 400-600 mm, about 7-8 minutes.

3. Lining Thickness and Control Method for Cement Mortar Lined Anti-corrosion Steel Pipes

For pipes with a diameter of 75-300 mm, the lining thickness is about 5 mm; for pipes with a diameter greater than 400 mm, the lining thickness is 8-10 mm. The required amount of cement for each pipe length can be calculated based on the diameter. For example, a pipe with a diameter of 600 mm and a length of 4 meters, with a lining thickness of 8-10 mm, requires approximately 60 kg of cement.

4. Lining Equipment

The lining equipment (commonly known as pipe enameling equipment) is relatively simple and includes drive wheels, driven wheels, variable speed wheels, and variable speed motors. It is best to use a motor with 4-8 speed levels, or alternatively, a variable frequency motor or a DC motor equipped with a silicon-controlled rectifier for stepless speed regulation. A regular motor with mechanical speed regulation can also be used, but it requires a clutch for speed adjustment. The center of the lined pipe should form an equilateral triangle with the centers of the drive wheel axle and the driven wheel axle, with a central angle of 90°-100°. For easy loading, unloading, and transportation, a crane should be installed above the lining equipment.

5. Operation Method for Cement Mortar Lined Anti-corrosion Steel Pipes

Place the pipe that needs lining on the centrifugal device, and calculate the required amount of cement based on the pipe diameter and length. After mixing the cement mortar, evenly pour it into the pipe. Start the centrifugal coating machine, gradually increasing the speed. After the specified time, stop the machine, remove the pipe, and transport it to the curing area for natural curing. In freezing seasons, take anti-freeze measures; in high summer temperatures, cover the pipes with straw bags and sprinkle water for curing. The curing time depends on the temperature: in high temperatures, generally only 2 days are needed, while at an average temperature of around 15°C, the curing period is 7-10 days.

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