What ASTM B111 Covers
ASTM B111 (and its metric companion B111M) covers seamless copper and copper-alloy tube for condensers, evaporators, and heat exchangers, in straight lengths with outside diameters generally up to about 3 inches. The standard sets composition limits, tempers, dimensions and tolerances, mechanical requirements, and the test methods used to verify the finished tube. It is one of the most widely cited specifications in power-plant, refinery, and marine heat-transfer work.
Alloy Groups in B111
| Alloy | Type | Typical Cooling-Water Service |
|---|---|---|
| C19200 / C19400 | Copper-iron | General condenser and heat exchanger tube |
| C23000 | Red brass | Fresh water, low-to-moderate velocity |
| C44300 / C44400 / C44500 | Inhibited admiralty brass | Fresh and brackish water, refinery service |
| C68700 | Aluminum brass | Clean seawater at moderate velocity |
| C61300 / C61400 | Aluminum bronze | Corrosive and erosive service |
| C70600 | 90-10 cupronickel | Seawater, high velocity, polluted water |
| C71500 | 70-30 cupronickel | Severe seawater, high velocity, brackish and sulfide water |
| C72200 | Cupronickel-chromium | Turbulent flow, chemical service |
Each alloy group is selected by balancing corrosion resistance, strength, thermal conductivity, and cost against the cooling-water chemistry and velocity.
Manufacture and Tempers
B111 tube is seamless, produced by piercing and drawing or by extrusion and drawing, and is normally supplied in annealed (O) or light-drawn (H55) temper. The annealed condition gives the ductility needed for rolling or expanding the tube ends into tube sheets, while light-drawn tube offers a smoother surface and tighter dimensions where installation allows.
Testing and Verification
The standard requires chemical analysis, tensile testing, and dimensional inspection, and permits several additional verification methods. The most important for heat-transfer service are:
Hydrostatic testing, which proves the tube holds pressure
Eddy-current examination, which detects cracks, pinholes, and wall-thickness anomalies
Flattening and flaring tests, which verify ductility for installation
Ultrasonic testing where specified
A mill test certificate reporting composition, mechanical results, and test results should accompany every order.
Selection Guidance
Match the alloy to the cooling-water quality: fresh water allows brass-based alloys; brackish water calls for inhibited brasses or cupronickels; and clean or polluted seawater at high velocity demands C70600, C71500, or C72200. Wall thickness is selected from the standard's schedule, and tube length, fins, and surface condition are specified on the order. Where biofouling is a concern, the cupronickel family offers natural resistance.
Applications
Surface condensers in thermal power plants
Feed-water heaters and moisture-separator reheaters
Refinery and chemical-plant heat exchangers
Marine condensers and evaporators
Desalination plant heat-transfer sections
Compressor intercoolers and aftercoolers
Frequently Asked Questions
Q: What does ASTM B111 cover?
A: Seamless copper and copper-alloy tube for condensers, evaporators, and heat exchangers, in straight lengths with diameters generally up to 3 inches.
Q: Which alloy should I choose for seawater?
A: Cupronickels are the standard seawater alloys: C70600 (90-10) for most service and C71500 (70-30) for high velocity or aggressive water. C72200 suits turbulent flow.
Q: What is the difference between B111 and B171?
A: B111 covers tube for condensers and heat exchangers; B171 covers plate and sheet for tube sheets and baffles used in the same equipment.
Q: How is B111 tube tested?
A:By chemical analysis, tensile testing, and dimensional inspection, plus hydrostatic, eddy-current, flattening, flaring, or ultrasonic tests as specified.
Q: Can B111 tube be bent or flared?
A: Yes. Annealed tube is ductile enough for rolling, expanding, and flaring, and light-drawn tube bends with proper tooling.
Q: What tempers are available?
A: Annealed (O) and light-drawn (H55) are the standard tempers for B111 condenser and heat exchanger tube.
Q: Is a mill test certificate required?
A: Yes, for engineered service the certificate reporting composition, mechanical properties, and test results should be supplied with the material.
