Alloy 20 Basket Strainers

The Falcon Alloy 20 series represents a premium solution for liquid filtration in highly corrosive environments. Engineered specifically for applications where standard stainless steel is prone to pitting and stress corrosion, these basket strainers offer a robust mechanical design paired with superior metallurgical stability.

• Body Material: Alloy 20 (CN7M Cast Grade), a columbium-stabilized austenitic silver-gray alloy.

• Pressure Classes: Available in ASME Class 150 and Class 300 ratings.

• Size Range: 1/2" (DN15) through 12" (DN300) as standard.

• End Connections: * Flanged: Raised Face (RF) per ASME B16.5.

  • Threaded: NPT per ASME B1.20.1.

• Filtration Media: Heavy-duty Alloy 20 baskets available in various perforations or fine mesh linings.

The Falcon design prioritizes flow efficiency and structural integrity:

1. High-Capacity Geometry: The internal chamber is designed to provide a large open-area ratio. This ensures a low pressure drop ($\Delta P$) and extends the time between cleaning cycles.

2. Seating Integrity: The basket rests on a precision-machined seat to eliminate "bypass," ensuring 100% of the media passes through the filtration element.

3. Cover Configurations: * Bolted Cover: For high-pressure safety and secure sealing.

   • Quick-Opening: Features specialized knobs or clamps for tool-free maintenance in lower-pressure systems.

4. Blow-Down Port: A NPT drain plug is included at the bottom of the body for easy removal of accumulated solids without removing the basket.

Falcon Alloy 20 strainers are the preferred choice for industries dealing with aggressive chemical profiles:

• Sulfuric Acid Handling: Specifically designed to resist corrosion in sulfuric acid environments, including mixing and pickling lines.

• Chemical Processing: Ideal for phosphoric and nitric acid production.

• Brine & Chlorides: Superior resistance to pitting in high-chloride environments compared to 316 Stainless Steel.

• Food & Pharma: Used in processes requiring high-level sanitization and resistance to acidic cleaning agents.

Every Falcon strainer is manufactured under a strict quality management system to ensure reliability in critical infrastructure:

• Pressure Testing: Each unit undergoes hydrostatic shell and seat testing in accordance with API 598.

• Wall Thickness: Built to ASME B16.34 standards to provide a generous corrosion allowance and long service life.

• Casting Quality: Castings are inspected to ensure uniform grain structure and the absence of porosity, critical for maintaining the chemical resistance of Alloy 20.

• Traceability: Heat numbers are etched into each body for full material traceability.

That is exactly right. The standout feature of Alloy 20 (often called "Sulfuric Acid Steel") is its exceptional performance in sulfuric acid environments. While other metals quickly succumb to thinning and pitting, Falcon Alloy 20 strainers are specifically formulated to handle these harsh conditions.

Sulfuric acid ($H_{2}SO_{4}$) is one of the most challenging chemicals to transport and filter. Standard stainless steels often fail due to the acid's highly oxidative nature. Falcon Alloy 20 basket strainers solve this problem through a precise chemical balance.

Alloy 20 was originally developed specifically to resist sulfuric acid. Its unique composition provides a "safety net" across varying concentrations:

• Nickel (32-38%): Prevents chloride-induced stress corrosion cracking.

• Chromium (19-21%): Provides resistance to oxidizing media like nitric acid.

• Copper (2-3%): This is the "secret ingredient" that protects the strainer against sulfuric acid specifically.

• Molybdenum (2-3%): Prevents localized pitting and crevice corrosion.