If it is installation, my answer is as follows:

1. What should be paid attention to in installation: First, you must buy regular gas from regular gas companies, ensure that the gas cylinders are qualified, ensure the quality of pressure regulating valves (buy from 20 yuan or above), and ensure the quality of special rubber hoses. Remember to install the card code to fix the connector;

2. What are the special requirements for pipeline materials? If you are talking about installation, and the installation distance is not more than two meters (according to the relevant regulations, the gas pipeline should not be less than 0.5 meters and not longer than 2 meters, and it should be replaced every two years), just buy a special gas hose (Ding Qing hose). If it is more than two meters, it is recommended to use seamless steel pipe and ask professionals to make it;

3. Whether to add protection and how to add it: If the special hose does not go through the wall, it is not necessary to add it. If you must go through the wall (generally, special hoses are not allowed), it is best to put an iron pipe around the wall. Always check when using, especially pay attention to whether the wall is worn or not, whether there are mouse bite marks, etc.

4. Do you need two independent pipes, or can you connect two pipes in series? If it is installed (not concealed), you can buy a double-headed pressure reducing valve, one end connected to the gas stove and the other end connected to the water heater.

If you're talking about concealed fittings, which are installed in the wall like water and electricity, you can't use special hoses. You should ask professionals to weld with seamless steel pipes. The answer is as follows:

1, what are the precautions for installation: not everyone can install this, so you have to hire a professional. For example, in a place like Shenzhen, if you install pipelines privately, the pipeline gas company will not supply you with gas. What you are saying here is that bottled gas does not have this problem, but it is still safety first;

2. What are the special requirements for pipeline materials? If it is hidden, you have to buy seamless steel pipes and special gas valves for gas;

3, whether to add protection: this depends on where you use it. Generally, anti-rust paint is painted on seamless steel pipes, and then yellow paint is painted. If you are still worried, do another anti-corrosion (professionals understand);

4. Do you need independent pipes, or can two pipes be connected in series: one pipe is used for the section coming out of the liquefied gas cylinder, and one pipe can be connected to the water heater by tee. Remember to add a special gas valve in front of the gas stove and water heater, and remember to close the valve after use.

I hope the above answers are helpful to you. If you have any other questions, please feel free to ask.