Galvanized steel pipe is better. Wear flat galvanized steel pipe plant Zhuang Teng hold off coupons platinum sly fire pipeline is used more widely.
Coated steel pipe galvanized steel pipe is a new fire after. Now the national standard GB / T5135.20-2010 sprinkler systems Part 20: coated steel pipe. Also made clear that the fire should be used in coated steel. National standards set forth in the fire to use coated steel. It has been clear coated steel pipe and galvanized steel pipe performance is certainly not a hierarchy.
Second, the price is based on coated steel on steel. Inside and outside wall coating. Forming a protective layer. That is not to protect the pipeline from corrosion. Letting pipeline without fouling, clogging. So the price of galvanized coated steel is certainly better than some of the high steel.