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In industrial pipeline systems, secure and leak-proof hose connections are crucial for maintaining operational reliability. Among various clamping solutions, the Double Bolt Clamp—also known as the Double Bolt Hose Clamp—has emerged as a preferred choice for high-pressure applications. Known for its strength, stability, and long service life, this component plays an essential role in connecting hoses and pipelines carrying air, water, oil, slurry, or other industrial media.
Manufactured mainly from ductile iron, these clamps combine mechanical robustness with flexibility, making them suitable for a wide range of industries such as mining, construction, agriculture, petrochemicals, and fluid transport.
A Double Bolt Clamp is a mechanical fastener designed to secure hoses to fittings or couplings. It features two bolts that tighten the clamp band around the hose, ensuring uniform compression and preventing slippage or leakage under pressure. Compared to single-bolt clamps, the double-bolt design provides higher clamping force and a more even pressure distribution, which is ideal for heavy-duty applications.
The Double Bolt Hose Clamp is typically composed of:
Clamp Body – made of ductile iron for durability and corrosion resistance.
Bolts and Nuts – usually zinc-plated or stainless steel to prevent rust.
Inner Surface – precision-machined to provide strong grip without damaging the hose.
The Double Bolt Clamp provides several engineering advantages over other types of hose clamps:
Two bolts allow for uniform tightening, creating a secure seal even under vibration or high-pressure conditions.
Ductile iron offers excellent tensile strength and elasticity, outperforming traditional gray cast iron. It can withstand repeated mechanical stress and resists cracking under torque.
The clamp can be easily removed and reused multiple times without significant loss of performance.
In environments where hoses are exposed to constant motion or vibration, the double bolt configuration prevents loosening and leakage.
Available in a range of sizes and configurations, the Double Bolt Hose Clamp can fit rubber hoses, PVC pipes, and composite tubing.
| Industry | Application | Media Handled |
|---|---|---|
| Mining | Slurry hose connections | Sand, water, gravel |
| Agriculture | Irrigation systems | Water and fertilizers |
| Construction | Concrete pumping hoses | Cement, mortar |
| Petrochemical | Fuel and oil transport | Hydrocarbons |
| Water Treatment | Pipe coupling and repair | Clean and waste water |
| Marine | Pump connections | Seawater and oil |
These clamps are highly valued in sectors that demand reliability and minimal downtime.
The Double Bolt Clamp made by OMEJA utilizes ductile iron (also known as nodular cast iron or spheroidal graphite iron) as its core material. Below are the key material properties:
| Property | Ductile Iron (EN-GJS-400-15) | Gray Cast Iron |
|---|---|---|
| Tensile Strength | 400 MPa | 200 MPa |
| Elongation | 15% | 0.5% |
| Impact Resistance | High | Low |
| Corrosion Resistance | Good | Moderate |
| Reusability | Excellent | Limited |
This makes ductile iron a superior choice for high-performance hose clamps.
Double Bolt Hose Clamps are typically categorized by their hose outer diameter and band width. Standard ranges include:
| Model | Hose OD (mm) | Bolt Size | Material |
|---|---|---|---|
| BU14 | 50–65 | M10 | Ductile Iron |
| BU24 | 65–90 | M12 | Ductile Iron |
| SL34 | 90–115 | M12 | Ductile Iron |
| SL525 | 115–140 | M14 | Ductile Iron |
These models ensure compatibility with most industrial hose types.
Correct installation of the Double Bolt Clamp is essential for optimal performance. Follow these steps:
Inspect the hose and fitting for wear or damage before installation.
Position the clamp evenly over the hose and fitting connection.
Tighten the bolts alternately to ensure even pressure distribution.
Do not overtighten, as excessive torque can deform the hose or fitting.
Recheck the torque after several hours of operation, especially in high-vibration environments.
Ductile iron, compared to other materials like carbon steel or stainless steel, offers a unique balance of strength, cost-effectiveness, and machinability. Its microstructure contains spherical graphite nodules that prevent crack propagation, allowing the clamp to absorb mechanical stress without failure.
Additionally, the anti-rust coating applied to ductile iron clamps enhances corrosion resistance, making them suitable for both indoor and outdoor applications, even in humid or marine environments.
| Feature | Double Bolt Clamp | Single Bolt Clamp |
|---|---|---|
| Clamping Force | High and uniform | Moderate |
| Pressure Range | Up to 20 bar | Up to 10 bar |
| Reusability | Excellent | Limited |
| Maintenance | Low | Moderate |
| Application Type | Heavy-duty | Light to medium duty |
This comparison clearly shows that Double Bolt Hose Clamps are ideal for demanding conditions requiring strong and stable sealing.
At OMEJA, each Double Bolt Clamp undergoes strict quality inspection procedures including:
Dimensional accuracy verification
Surface coating thickness testing
Torque resistance testing
Corrosion resistance simulation (salt spray test)
Mechanical stress and fatigue testing
All clamps are manufactured under ISO-certified foundry conditions to ensure consistency and reliability.
To maximize the lifespan of Double Bolt Hose Clamps:
Store in a dry, ventilated area to prevent rust.
Avoid prolonged exposure to corrosive chemicals.
Lubricate bolts lightly before reassembly.
Replace bolts and nuts showing wear or corrosion.
Proper care ensures the clamps can be reused safely for years.
Q1. What materials are used for Double Bolt Hose Clamps?
Most industrial-grade clamps are made of ductile iron, known for its durability and high strength. The bolts and nuts may be made of zinc-plated steel or stainless steel.
Q2. Can these clamps be used for high-pressure applications?
Yes. The double-bolt design and ductile iron structure make them ideal for medium to high-pressure pipelines.
Q3. How do I choose the right size?
Measure the outer diameter of your hose and select the clamp model that matches your measurement range. Refer to the manufacturer’s size chart for precision.
Q4. Are these clamps resistant to corrosion?
Yes. Ductile iron clamps are coated with anti-corrosive paint or galvanization for enhanced surface protection.
Q5. Can I reuse the clamps?
Absolutely. As long as the bolts and clamp body are not damaged, Double Bolt Hose Clamps can be reused after proper inspection.
In a slurry pumping system used in a mining operation, hoses experience constant pressure surges and vibration. Standard single-bolt clamps often failed within months, causing leakage and downtime. After replacing them with OMEJA Double Bolt Hose Clamps made from ductile iron, the system achieved over 12 months of continuous operation without leakage or retightening, reducing maintenance costs significantly.
The Double Bolt Clamp and Double Bolt Hose Clamp are indispensable components in modern industrial fluid systems. With their strong clamping power, durable ductile iron construction, and reliable performance under pressure, they ensure secure and leak-free connections even in harsh environments.
By understanding their design, material properties, and proper installation, industries can significantly improve system reliability and reduce maintenance frequency.
For inquiries or technical consultation about ductile iron Double Bolt Hose Clamps, contact OMEJA — a trusted manufacturer of high-performance cast fittings and clamps.
Phone: +86-15243599988
Email: whp@omj-casting.com
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