High Pressure Brass Compression Fittings

FAQ

• Q: How do you achieve a high pressure rating in a brass compression fitting?
• A: We use hot forging to maximize brass density, apply a specialized ferrule material for a superior bite, and design the body with thicker walls and precise conical geometry to withstand greater hoop stress.

• Q: Can these fittings be used with standard wall copper tubing?
• A: No. High pressure fittings must be used with thick-walled (heavy gauge) copper, steel, or specialty alloy tubing, as standard soft copper tubing will likely burst at these high pressures.

• Q: Are the high-pressure brass fittings typically single or double ferrule?
• A: They can be either. High-pressure ratings are often achieved with a single ferrule design optimized for strength and bite, though we offer double ferrule versions for maximum vibration resistance in instrumentation.

• Q: What is the recommended torque procedure for a high-pressure fitting?
• A: High-pressure fittings require a specific "turn-of-the-nut" procedure (e.g., hand-tight plus $1 \frac{1}{4}$ turns) that is clearly specified on the technical drawing. A torque wrench is highly recommended to prevent over- or under-tightening.

• Q: Do you offer these fittings in sizes larger than 1 inch OD?
• A: Yes, but the compression principle becomes less effective and the required torque is massive. For high-pressure lines over 1 inch, we typically recommend specialized flange or thread-welded connections.

• Q: What is the primary cause of failure in high-pressure compression fittings?
• A: The primary cause is improper installation, specifically failure to achieve the correct initial tube bite or using tubing that is not rated for the system's working pressure.

• Q: Can these fittings be nickel-plated for corrosive environments?
• A: Yes. Nickel plating is a common option that enhances the external corrosion resistance of the brass, especially when the fitting is exposed to moisture or chemical fumes.

• Q: Are the ferrules in high-pressure fittings usually reusable?
• A: No. Due to the extreme deformation required to achieve a high-pressure seal, the ferrule is considered a single-use component and must be replaced upon every disconnection and reconnection.

• Q: Are your high-pressure fittings interchangeable with industrial standards like Swagelok/Parker?
• A: Yes, our high-pressure compression fittings are designed to be dimensionally and functionally interchangeable with the leading global instrumentation brands to facilitate system maintenance.

• Q: Do you conduct pressure testing on every single fitting?
• A: No, we perform batch-wise destructive burst pressure testing on a statistical sampling rate and then perform a 100% pneumatic leak test on all finished fittings before final packaging.