Boiler Tube: Stainless Steel and Nickel Alloys

stainless steel boiler tube

Stainless Steel and Nickel Alloy boiler tube is installed inside the boiler to heat water to generate steam, the boiler is a closed-pressure vessel designed in varieties of types, water tube boilers and fire tube boilers are the main types. Tubes inside the boiler withstand water and steam pressure, to prevent tube leaks in damage, quality boiler tubes withstand high pressure and heat resistance.

ASTM A213 for the seamless tubes and A249 for the welded tubes are the main specifications for stainless steel boiler tubes. Tubes are processed by cold drawn, heat treated and pickling finishes, cleaning and smooth surfaces inside and outside should be made, quality tubes can stand in high pressure and high-temperature conditions. Boiler tube material selection is important, different grades suit different types of boilers, tubes have to meet complex boiler environments, like Heat Pass location and flow direction, boiler pressure, temperature, steaming rate, and boiler material, etc.

Boiler Tube Specifications

Stainless Steel Grades: 

These stainless steels have high strength and good corrosion resistance in high temperate conditions, good properties result from varieties addition of alloys, and stainless steel boiler tubes can meet high pressure and temperature requirements.

Nickel Alloys

UNS N08825, UNS N06625

Sizes of Boiler Tube

Outside diameter: 12.7, 25.88, 19.05, 25.4m, 31.8, 38.1 mm

Wall thickness: 0.71, 0.89, 1.0,1.2, 1.5, 1.65, 2.11 mm

Quality Assurance

We have the capability and capacity to ensure the boiler tubes are in superior condition, with advanced inspection and testing procedures, standard tests include dimensional examination, visual checking, chemical composition, mechanical properties as well as non-destructive test 100% eddy current test.

American Boiler can retube boilers by all leading manufacturers like Cleaver-Brooks, Hurst, and Johnston Boiler, restoring them to factory specifications. We also offer custom bent tubing, cracked tube sheet repair, and tube sheet replacement. We provide custom welding in-house or on-site and offer a complete inventory of replacement boiler tubes in all sizes, thicknesses, and materials, such as:

Boiler Retubing Process

For each boiler tube, should perform NDT testing as needed. we use dye penetrant testing to expose areas of boiler tube sheet cracking. Old boiler tubes are removed along with the tube ends. Any minor tube sheet cracks are then repaired to the ASME code specifications. New boiler tubes (manufactured to meet or exceed specifications) are installed, rolled, beaded, and sometimes welded (in the hot pass).

Hydro-tests the boiler, witnessed by our authorized inspection agency. The boiler is then closed and prepared to fire using all new gaskets. We visually check scale and fit during this phase. We provide ultrasonic thickness testing, or borescope the inside of water tube boiler tubes as required.

Fire Tube Boiler

Fire-tube boiler is a type of boiler in which hot gas passes from the fire through one or more pipes that pass through a sealed water container. The heat of the gas is transferred through the wall of the tube through heat conduction, heating the water and eventually generating steam. Fire tube boilers are the third of the four historical types of boilers: low-pressure tank or “haystack” boilers, flue boilers with one or two large flues, fire tube boilers and high-pressure boilers with many small tubes

Water Tube Boiler

A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. The fuel is burned in the furnace to produce hot gas, which heats the water in the steam generation tube. In smaller boilers, the additional power generation tubes are separated in the furnace, while larger utility boilers rely on water injection tubes that make up the furnace wall to generate steam. High-pressure water tube boiler: The hot water then rises into the steam drum. Here, saturated steam is drawn away from the top of the drum

Applications

  • Chemical Processing
  • Computer Data and Storage Rooms
  • Food Processing
  • Hospital Air Conditioning
  • Marine Service Cooling
  • Office & High-Rise Building Air Conditioning
  • Petro Chemical Cooling
  • Pharmaceutical Air Conditioning
  • Power Plant Cooling
  • University & College Air Conditioning