Structural FRP Tanks

Introducing the optimal solution for both residential and light commercial water treatment systems that seek adaptability. Elevate your water treatment setup with our Structural FRP Vessels. Our tanks are lightweight and simple to install, crafted using standard polyester or a chemical-resistant vinylester construction tailored to meet your specific requirements.

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Advantages and Features

• Constructed from standard polyester or chemical-resistant vinylester materials
• Simple handling and installation process
• 10-year warranty for vessels ranging from 6" to 13" (applicable for softening and filtration purposes)
• 5-year warranty for vessels measuring between 14" to 16" (applicable for softening and filtration purposes)
• 2-year warranty for vinylester-based vessels used in deionization processes

Specifications Overview

Pentair Standards:

• Safety factor rated at 4:1
• Minimum burst pressure of 600 psi
• Proven performance in 250,000 cycles without leakage

NSF Standards:

• Safety factor rated at 4:1
• Minimum burst pressure of 600 psi
• Verified performance in 100,000 cycles without leakage

Residential tanks with diameters of 6" to 16" are NSF 44 Certified. For commercial tanks with diameters from 18" to 63", they hold NSF 61 Certification.

• Maximum operating pressure: 150 psi
• Temperature limits: 120°F for polyester; 150°F for vinylester

Certifications

• Vessels tested and certified by NSF International to NSF/ANSI Standard 61, ensuring stringent material and structural integrity standards.

Available Colors

• Black
• Blue
• Natural

Fibre Reinforced Plastic (FRP) vessels have emerged as an excellent substitute for traditional pressure vessels constructed from MSRL (Mild Steel Rubber Lining) and SS (Stainless Steel). The surging demand for FRP vessels can be attributed to several key factors:

• Lightweight design
• Cost-efficient option
• Zero corrosion potential
• Adequate strength for use in Reverse Osmosis (RO), softening, and demineralization (DM) plants
• Operating pressure capability of up to 10 Bar
• Burst pressure capacity of 40 Bar

Despite these advantages, FRP vessels face a significant limitation regarding their ability to withstand negative suction pressure, commonly known as vacuum. Most manufacturers, globally, limit the vacuum pressure tolerance for these vessels to 5" HG (0.17 Bar). It is perplexing that a vessel capable of enduring high positive pressures of up to 40 Bar can fail under a minor vacuum pressure of 0.17 Bar, leading many system developers to neglect this issue and encounter unforeseen problems.

Understanding the Manufacturing Process of FRP Vessels

To comprehend this limitation, it's crucial to first understand how FRP vessels are manufactured. The core of the FRP vessel comprises a thermo-plastic liner, predominantly made of polyethylene.

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This liner is reinforced by wrapping continuous strands of glass fibre in a cross-lap weave configuration. Special binders and resins are utilized during the winding processes to ensure a robust adherence of glass fibre to the vessel body.

Vacuum-Induced Failure Mechanism

When a vessel operates under vacuum pressure, the inner liner is at risk of being drawn inward, which also pulls the winding. The continuous cycle of this action causes significant wear over time and leads to cracks in the inner liner. Water can infiltrate these cracks, seeping out of the vessel, and an inexperienced operator might misconstrue this as a simple pinhole leak. However, the reality is that it results from a liner breach due to vacuum pressure.

In extreme cases of vacuum pressure, potentially instigated by high-capacity pumps, the liner may rupture, leading to the failure of the outer winding as well.

Vacuum Causes in Reverse Osmosis Systems

Below is a summary of factors that can lead to vacuum pressure in an RO system:

1. If the water source is an underground well or sump, a vertical submersible pump is typically employed to transport the water upward. When the system shuts down, water naturally retreats to a lower elevation source, which may not include a non-return valve. This backward flow can create negative suction pressure, weakening the liner and precipitating failure.
2. A lack of a low-pressure switch could cause the RO system to operate without water in the source, leading the high-pressure pump to run dry and generate harmful vacuum pressure.
3. If a sand filter fails to be backwashed regularly, it might become entirely clogged, subsequently causing the high-pressure pump to run dry, creating further vacuum pressure that damages the vessel.

Mitigating Vacuum-Related Failures

• Ongoing technological advancements are yielding stronger materials for the inner liner, which show better resilience against suction pressure.
• Implementing a fully automated system with multiple control points and pressure switches to cut the system's power when negative pressure is detected can enhance safety.
• The most cost-effective solution is the installation of a vacuum breaker: a basic normally closed valve positioned after the vessel. Under negative pressure, the valve mechanism opens to allow atmospheric air into the line, thus ending the vacuum.

GSE Filter Pvt Ltd stands out as a premier provider of high-quality FRP Tanks under the ATLANTIC PLUS brand.

For further insights, visit GFRP Pipe.