Armstrong International 30B3 Steam Trap 30 psi 3-7/8 in L - 30B3
The Armstrong International 30B3 Steam Trap is designed for steam systems requiring a maximum operating pressure of 30 psi and a temperature of up to 353 degrees Fahrenheit at 125 psig. Made from cast iron, this steam trap ensures durability and reliability in various industrial applications.
The Armstrong International 30B3 is engineered for efficient steam and condensate management in industrial settings. Its robust cast iron body and horizontal trap position make it suitable for high-demand applications.
- Maximum operating pressure: 30 psi
- Temperature: 353 degrees Fahrenheit at 125 psig
- Connections: 3/4 inch NPT
Specifications
| Max. Operating PSI |
30 psi |
| Max. Temperature |
353 °F at 125 psig |
| Connection Type |
(F)NPT |
| Connection Size |
3/4 inch |
| End to End Length |
3-7/8 inches |
| Condensate Capacity |
1,400 lbs/hr |
| Trap Position |
Horizontal |
| Country of Origin |
United States |
What our Experts Think
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Durable construction: Cast-iron body provides ruggedness and long service life in steam systems.
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Float & thermostatic operation: Float mechanism handles heavy condensate loads, while the thermostatic element efficiently vents air and non-condensables.
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Pressure-rated: Suitable for operating pressures up to 30 psi, ideal for low- to moderate-pressure steam applications.
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Compact design: 3/4″ NPT inlet/outlet with a 3‑7/8″ face-to-face length allows space-efficient installation.
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Air-venting capability: Thermostatic vent removes air across a wide pressure range to maintain system efficiency.
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Capacity: Handles condensate loads up to approximately 1,450 lb/hr, suitable for moderate-duty applications.
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Limitations: Not recommended for systems prone to freezing or extreme hydraulic/thermal shock due to cast-iron construction.
Q&A
Q: What is the Armstrong 30B3 steam trap?
A: A float-and-thermostatic steam trap designed for steam-service systems.
Q: What is its maximum operating pressure?
A: 30 psi.
Q: What is the body material?
A: Cast iron.
Q: What is the connection size?
A: ¾″ NPT (female).
Q: What is its condensate capacity?
A: Up to approximately 1,400 lb/hr.
Q: What is its end-to-end (face-to-face) length?
A: 3‑7/8 inches.
Q: What is the maximum temperature rating?
A: Up to ~353°F.
Q: What type of steam trap is it?
A: Float & Thermostatic – uses a float to trap condensate and a thermostatic vent to purge air and non-condensable gases.
Q: What applications is it best suited for?
A: Steam mains, heat exchangers, and other processes requiring reliable condensate removal and effective air venting at low to moderate pressures.
Maintenance Tips
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Install a strainer upstream of the trap and blow it down regularly to prevent debris from entering.
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Keep the discharge line short and pitched downward to allow gravity drainage.
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Use isolation valves before and after the trap to allow maintenance without shutting down the system.
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Test the trap routinely to confirm proper cycling and discharge.
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Inspect for air or water locking, especially during startup, as poor venting can affect performance.
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Avoid oversizing the trap relative to the condensate load to prevent short cycling and steam loss.
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Check for high back-pressure in the return line, which can disrupt trap function.
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Keep the trap accessible and install it below the drip point when possible.
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Maintain a log of trap tests, cleanouts, and any repairs or replacements.
