If the fire sprinkler pipe is in the ceiling, it does not need to be painted.

Regardless of whether it is in the ceiling or not, the fire hydrant system generally uses welded steel pipes, and the surface needs to be anti-corrosion, and at the same time, there must be color marking, so all are generally painted with red paint; One anti-rust paint, 2 red topcoats;

The spray system is generally made of hot-dip galvanized steel pipe, which is connected by grooves, so it generally does not need to be painted, and only serves as a functional identification of the pipeline.

This design does not require a drawing brush, just do the pipe color ring.

No, Article 1 of the Technical Specification for Fire Water Supply and Fire Hydrant Systems (GB50974-2014).

If it is a galvanized pipe, you don't need to brush it, it is generally galvanized.

There should be no need to paint.

It is best to brush down the anti-rust paint, brush it when the fire pipe is installed, rarely do not see the brush, do not brush will rust, the regulations do not see,

Generally, it is painted with ordinary iron red paint.

Anti-rust twice on the red side.

You can check the construction specifications and drawing instructions.