External pipe coating: long-term corrosion protection
Steel pipes used in demanding onshore and offshore environments require a reliable external coating process to protect against corrosion, mechanical impact and harsh operating conditions.
Bauhuis supplies turnkey systems for three-layer external pipe coating, combining surface preparation, heating, FBE application, adhesive application, PE or PP extrusion, quenching, end-cleaning and inspection in one integrated production line.
Turnkey external pipe coating plants
Bauhuis designs and delivers turnkey external pipe coating plants for pipes ranging from 4” to 120” in diameter. Each plant is engineered around the required output, available space and coating specification.
A complete Bauhuis external coating plant can include all essential process stages:
Pre-washing
Pre-heating
External blasting
Phosphoric acid and chromate treatment
Induction heating
FBE application
Adhesive application
PE or PP extrusion
Quenching
End-cleaning
Inspection
Coating systems for different applications
The Bauhuis external pipe coating line is designed for three-layer anti-corrosion coating systems. This system starts with a fusion bonded epoxy layer, followed by an adhesive copolymer or intermediate bonding layer, and finished with an outer layer of polyethylene or polypropylene.
Depending on the project requirements, Bauhuis can design the system for:
Three-layer PE or PP coating
FBE and adhesive application
PE or PP extrusion
Full inspection of coating integrity
Compliance with international standards, including CAN/CSA-Z245.21, NFA 49-710, DIN 30670–30678 and EN 10285
Safe and efficient pipe handling
Efficient pipe handling is essential for a reliable external coating process. Bauhuis pipe handling systems enable controlled movement of pipes between washing, heating, blasting, coating, cooling and inspection stages.
The systems combine robust mechanical construction with power and control technology, supporting safe, efficient and automated pipe movement throughout the coating line.
Reliable surface preparation
Surface preparation is a critical step in achieving strong coating adhesion. The Bauhuis external pipe blasting system is a fully enclosed unit designed to clean the outer surface of steel pipes with precision and consistency.
Each blasting machine uses turbine wheels powered by electric motors and is equipped with a hardened steel lining to reduce wear and maintenance. An integrated blast media reclaim system cleans and recycles abrasive material for continuous operation.
Bauhuis blasting systems achieve SIS SA 3 / ISO 8501-1 / SSPC-SP-5 surface cleanliness levels and are designed in line with international standards including API 5L, ISO 8501-1, ISO 8502-3 and ASTM D4940.
