Admiralty Brass Tube Bundle C44300 | ASME SB111 Seamless Tubes | Copper Alloy Heat Exchanger Bundle for Seawater & Marine Cooling – Replacement Tube Bundle
Yuhong Group: Specialized in Heat Exchanger Tubes & Full Bundles
Yuhong Group Co., Ltd. supplies complete thermal systems - shell & tube heat exchangers (TEMA heat exchanger designs), pressure vessels, air coolers - and every critical component: Fin Tube, Furnace Tube, Heat Exchanger Tube, Stainless Steel Seamless Tube, Nickel Alloy Tube, Copper alloy tube, heat exchanger tubesheet, and heat exchanger tube bundle. For seawater and brackish water services, we offer high-performance copper alloy tube bundles manufactured from Admiralty Brass C44300 - a proven material resistant to corrosion, biofouling, and impingement attack.
Product Focus: Admiralty Brass C44300 Tube Bundle - Designed for Marine Cooling
The Admiralty Brass C44300 tube bundle is a heat exchanger tube bundle specifically engineered for shell & tube condensers and coolers operating with seawater, brackish water, or high-chloride cooling water. Each bundle features ASME SB111 C44300 seamless tubes (Admiralty brass with a nominal composition of 70-72% Cu, 28-30% Zn, plus trace tin and arsenic for dezincification resistance). The tubes are rolled into a compatible copper alloy tubesheet (typically naval brass C46400) and assembled with baffles, tie rods, and impingement protection - delivering long service life in aggressive marine environments.
What's Inside a C44300 Tube Bundle - Components & Their Roles
| Component |
Material / Standard |
Role in Equipment Performance |
| Heat Exchanger Tube (C44300) |
ASME SB111 / Admiralty Brass |
Primary heat transfer surface; excellent resistance to seawater corrosion and biofouling. The added tin and arsenic inhibit dezincification. |
| Fin Tube (optional) |
C44300 tube + aluminum or copper fin |
Increases surface area when cooling gas or low-HTC fluids; boosts capacity without enlarging shell. |
| Furnace Tube |
Not typical for C44300 (used in high-temp services) |
For reference: heavy-wall tubes for fired heaters - not applicable here. |
| Stainless Steel Seamless Tube |
Alternative material for same bundle envelope |
Not used in this bundle, but we supply SS seamless tubes separately for other applications. |
| Nickel Alloy Tube |
Alternative for extreme corrosion |
Not in this bundle; available as separate product. |
| Copper alloy tube (C44300) |
Core of this bundle |
Seamless, arsenic-inhibited Admiralty brass. |
| Heat Exchanger Tubesheet |
Naval Brass C46400 or C70600 (Cu-Ni) |
Holds tube ends; material selected for galvanic compatibility with C44300. |
| Baffles |
Naval Brass C46400 or coated carbon steel |
Guide shell-side flow, support tubes, enhance heat transfer. |
| Tie Rods & Spacers |
Naval Brass or silicon bronze |
Maintain baffle spacing; resist corrosion in seawater. |
| Impingement Plate |
C70600 (90/10 Cu-Ni) or C44300 |
Protects tube ends from high-velocity inlet flow erosion. |
Why Admiralty Brass C44300 for Seawater Service?
- Excellent corrosion resistance to clean seawater and brackish water - outperforms carbon steel and many stainless steels.
- Dezincification inhibited - arsenic addition prevents selective zinc leaching, a common failure mode in ordinary brass.
- Good thermal conductivity (approx. 100 W/m*K) - efficient heat transfer.
- Biofouling resistance - copper ions discourage marine growth on tube surfaces.
- Cost-effective - significantly less expensive than titanium or nickel alloys, while offering adequate life for many marine applications (10-15 years).
Technical Highlights of Our Admiralty Brass Bundle
- Tube-to-tubesheet joint: Precision expanded (rolled) connection - no welding required to avoid heat-affected zone corrosion. Grooved tubesheet holes enhance holding strength.
- Impingement protection standard: For inlet water velocity >2 m/s, we install a C70600 impingement plate opposite the nozzle. This simple feature can double tube bundle life.
- Optimized tube layout: Triangular pitch maximizes heat transfer; square pitch available for easier mechanical cleaning.
- Full ASME compliance: Material certifications, hydrostatic testing, and dimensional reports included.
Knowledge Module: Admiralty Brass C44300 vs. Other Copper Alloys - Which Tube Bundle to Choose?
| Alloy |
Best Suited For |
Limitations |
Typical Life in Seawater |
| C44300 (Admiralty Brass) |
Clean seawater, brackish water, moderate velocity (≤2.5 m/s) |
Susceptible to impingement attack at high velocity; not for polluted or stagnant seawater |
10-15 years |
| C70600 (90/10 Cu-Ni) |
Higher velocity seawater (≤3.5 m/s), polluted water, offshore platforms |
More expensive than Admiralty brass |
15-20 years |
| C71500 (70/30 Cu-Ni) |
Very high velocity, solids-laden seawater, naval applications |
Highest cost among copper alloys |
20-30 years |
| Titanium (Grade 2) |
Extreme corrosive conditions, any velocity - but overkill for clean seawater |
Very high cost, difficult to roll into tubesheet |
30+ years |
When to choose C44300:
- Your cooling water is clean seawater (no heavy silt, no pollution).
- Velocity is controlled (typically 1.5-2.5 m/s).
- You need a cost-effective replacement for an existing Admiralty brass bundle.
- Expected bundle life of 10-15 years matches your maintenance cycle.
Common Failure Modes of Admiralty Brass Bundles (And How We Prevent Them)
| Failure |
Cause |
Our Prevention |
| Impingement attack |
High inlet velocity without protection |
Always include impingement plate for liquid inlet >2 m/s. |
| Dezincification |
Poor alloy quality or stagnant water |
Use certified C44300 with arsenic content; avoid stagnant conditions. |
| Ammonia corrosion |
Ammonia in water (e.g., fertilizer plant runoff) |
Not suitable - recommend Cu-Ni or titanium instead. |
| Tube end erosion |
Turbulent flow at tubesheet face |
Provide inlet end bevel and proper tube projection beyond tubesheet. |
Advantages of Replacing Your Old Bundle with Our C44300 Bundle
- Direct fit - manufactured to your original bundle drawing or field measurements.
- Restored performance - replaces corroded, fouled, or leaky tubes.
- Lower cost than buying a complete new heat exchanger.
- Fast turnaround - typical 5-6 weeks for custom bundle.
- Component support - we can also supply only fin tubes, heat exchanger tubesheet, or individual copper alloy tubes for your own assembly.
Typical Applications for C44300 Tube Bundles
- Shipboard coolers - engine jacket water coolers, lube oil coolers (seawater side).
- Coastal power plants - auxiliary cooling water condensers.
- Desalination plants - brine heaters, evaporator condensers.
- Offshore platforms - process coolers (where Cu-Ni is often preferred, but C44300 used for less critical duty).
- Industrial chillers - once-through seawater cooling.
Customization & Component-Only Availability
Need only parts instead of a full bundle? We supply:
- C44300 seamless tubes - cut to length, with or without end finishing.
- Fin tubes - C44300 base tube with aluminum or copper fins for air coolers.
- Heat exchanger tubesheet - drilled and grooved in C46400 or C70600.
- Baffles, tie rods, impingement plates - any copper alloy or coated carbon steel.
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