1. ground surface and underground engineering
2. Platform for ship building
3. marine/ petroleum,water, supplies for coal gas/ natural gas, electric power, industrial production, Wastewater Treatment, and maintenance, etc.
4. Application of pipe line: crude oil pipeline, coal gas pipeline, natural gas pipeline, Water Supply and Drainage pipeline, fuel pipeline, aviation and automobile only pipeline, lubricating oil pipeline, sludge pipeline, suction pipeline , water flush power pipeline, Cable Protection pipeline, Seawater/Fresh Water pipeline, Turbine pipeline, air conditioning pipeline, fire control pipeline , vent pipe pipeline, compressed air pipeline.