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Filtration Systems

Filters & Separators.

Our standard filtration products can be applied to a variety of conditions for the removal of suspended particulate. Custom systems can be engineered to meet specific requirements, including the use of different filter media to enhance filtration.

Puroflux Separators

Puroflux offers a broad spectrum of separators in a range of materials and configurations.

Overview

Puroflux’s complete line of separator and separator packages lend themselves to a wide range of applications for removing suspended particulate. Our standard equipment can handle flow ranges from 5 to 20,000 gpm and operating pressures up to 150 psi. Constructed from carbon steel, these rugged units can be installed in the harshest of environments. Custom separator systems can be designed and fabricated to meet specific requirements.

Description of Operation Hydrocyclone Separator

The basis for solid-liquid separation in the PF-60 series is the centrifugal forces created in the body of the separator. As the pressurized process carrying fluid1 enters tangentially into the entrance chamber of the separator, it starts a downward helical flow. This downward spiral motion causes high centrifugal forces to act on the carrying fluid. The solids in suspension are pushed to the wall of the separator and then move downward to the accumulation chamber (underflow)2 at the bottom of the separator. The clean process fluid then reverses its axial direction and moves upward in a helical flow exiting the separator (overflow)3.

 

Description of Operation Hydrocyclone Separator

There are many factors that can contribute to the success of the solid-liquid separator. It is important to understand and consider several issues when installing a hydrocyclone separator on a process system: system flow, velocity of the process fluid through the separator, pressure loss, specific gravity of the carrying fluid and particulate to be removed, and the purge cycle.

It is vital that the velocity of the carrying fluid be kept high in order to develop centrifugal forces in the body of the separator. Puroflux separators are designed with varying flow rates to insure that the separator selected will perform as expected.

Flow rate versus pressure loss are given for various PF-60 series separators to aid in selection (see individual specification sheets). The ideal operating pressure drop through a Puroflux separator is between 4-10 psi.

It is also important to note that the specific gravity of the solid to be separated from the carrying fluid must be higher than the specific gravity of the carrying fluid. The greater the specific gravity of the contaminate, the higher the removal efficiency of the separator. Puroflux separators can remove particulate as low as 45 micron (nominal) with a specific gravity greater than 1.2 on a recirculating basis.

Purging is necessary to eliminate the high concentration of solids build-up in the separator’s accumulation chamber and can be performed while the separator remains on-line. The level of contaminants in the process system will dictate the purge frequency and may warrant the use of an optional recovery system. If a recovery system is used, the separator will purge constantly at a low flow rate.

Puroflux Permanent Media Filters

Media filters are one of the most common ways to filter water as they are simple, effective, and require very little attention. Water is routed through a sand-filled pressure vessel. Over time, dirt accumulates in the spaces between the sand particles causing the pressure in the vessel to rise as water finds it harder to pass through. This signals you to “backwash” the filter. Simply reverse the water flow and “knock out” the dirt.

Overview

Our standard filtration products can be applied to a variety of conditions for the removal of suspended particulate. Custom systems can be engineered to meet specific requirements, including the use of different filter media to enhance filtration.

Permanent Media Filtration

Permanent media filtration has a distinct advantage over disposable bags, cartridges or hydro cyclone separators. Permanent media filtration is a positive filtering media that is easily backwashed for cleaning. Puroflux filters utilize the finest media. This media can be used individually or combined to optimize filtration efficiency. Puroflux standard media physically removes particulate 10 micron and smaller.

Filtration Cycle

Influent1 is directed through a series of valves into the overdrain of the filter, where it is evenly distributed over the filtration media. It is then forced down through the media bed where the suspended particulate is trapped in the voids formed between the media. The clean effluent2 then passes through the underdrain and is returned to the original source. As the voids in the media are filled, the filter will start to blind off. When the maximum differential pressure is reached, the filter will require a backwash.

 

SAND MEDIA FILTER BASICS (FILTRATION MODE)

Backwash Cycle

The filter is backwashed by reversing the fluid flow through the filter. The backwash fluid is directed into the filter through the underdrain and up through the media. As the backwash fluid moves through the media it causes the bed to lift and separate. The tumbling action of the media causes a scouring effect which releases trapped particulate and suspends it in the backwash flow. The fluid then carries the particulate that is suspended up through the overdrain and out to waste.

SAND MEDIA FILTER BASICS (BACKWASH MODE)

Disc Filters

Its patented design and high quality materials used in manufacturing guarantee an extended life with high resistance.

AZUD HELIX

PF 70
DATA SHEET

Overview

Puroflux’s line of disc filter system permits a wide range of flows and configurations using minimal number of components. They are compact assembled systems for easy transportation and installation.

Advantages

  • Disc Filtration. Maximum safety.
  • AZUD HELIX System
  • Self-cleaning filtering element
  • Modularity, Versatility, Compatibility.
  • Compact assembled systems for easy transportation and installation.
  • Manufactured in plastic materials.
  • Low Maintenance.
  • Water and energy saving.

Can Any Thickness of Plate Be Serviced on PHEs?

Plate and frame heat exchangers (PHEs) are critical for efficient heat transfer in industries like HVAC, food processing, and power generation. Their plates, typically ranging from 0.4mm to 1.0mm in thickness, are prone to fouling and wear, requiring regular servicing.

A common question is: Can any thickness of plate be serviced on PHEs?

Yes, PHE plates of various thicknesses can be serviced, but the process requires careful consideration to avoid damage

Understanding PHE Plate Thickness

PHE plates, often made of stainless steel or titanium, vary in thickness (e.g., 0.4mm for high-efficiency units, 0.7mm or thicker for durability. Thinner plates (0.4mm) are more delicate, while thicker plates withstand higher pressures but may be harder to clean due to complex fouling patterns.

How Are PHE Plates Serviced?

Servicing methods for PHE plates include:

  • Clean-in-Place (CIP):  CIP systems, circulating chemicals like citric acid dissolve scale without disassembly, suitable for all plate thicknesses.
  • Chemical Flushing: Heat Exchanger Ontario uses portable units to circulate mild acid solutions for 6–8 hours, effective for 0.4mm to 1.0mm plates, though hardened scale may require additional methods.
  • High-Pressure Water Jetting: For severe fouling, T.H. Industrial Solutions employs a 10 hp gas pressure washer, but thin plates (0.4mm) risk denting or puncturing if pressure exceeds safe limits.
  • Inspection and Testing: Dye penetrant testing, used by T.H. Industrial Solutions, detects cracks or pinholes, critical for thin plates prone to the “pop can effect” (flexing-induced cracking).

 

Risks and Considerations by Plate Thickness

  • Thin Plates (0.4mm): Highly susceptible to damage from high-pressure jetting or aggressive chemicals Over-tightening during reassembly can deform gasket grooves
  • Thicker Plates (0.7mm–1.0mm): More durable but may retain stubborn fouling, requiring combined chemical and mechanical cleaning
  • Material Compatibility: Chemicals must match plate materials (e.g., titanium or stainless steel) to avoid corrosion
  • Environmental Compliance: Spent chemicals must be neutralized

Effectiveness of Servicing Across Plate Thicknesses

Servicing restores efficiency by removing fouling, which can cause a 20% thermal efficiency loss even at paper-thin levels. CIP is effective for all thicknesses, while high-pressure cleaning suits thicker plates better. Regular servicing every 5–6 years or at 7–10 psi differential pressure prevents severe fouling

Conclusion

PHE plates of any thickness can be serviced using CIP, chemical flushing, or high-pressure jetting, but thinner plates require extra care to avoid damage. Industry leaders like T.H. Industrial Solutions offer tailored services to ensure safe, effective maintenance.

Can Water Hammer or Spiking Damage Plate & Frame Heat Exchangers?

Plate and frame heat exchangers (PHEs) are widely used in industries like HVAC, food processing, and power generation for efficient heat transfer. However, operational issues like water hammer or pressure spiking can pose significant risks.

A common question is: Can water hammer or spiking damage plate & frame heat exchangers?

Yes, water hammer and pressure spiking can damage PHEs, particularly affecting gaskets and plates, as noted by experts like T.H. Industrial Solutions and Alfa Laval. Understanding these risks is crucial for proper maintenance and operation.

What Are Water Hammer and Spiking in PHEs?

Water hammer is a sudden pressure surge caused by rapid valve closure or flow changes, creating shockwaves in the system. Spiking refers to abrupt pressure or temperature fluctuations, often exceeding design limits. Both can stress PHE components, especially thin plates (e.g., 0.4mm) and gaskets

Risks of Water Hammer and Spiking on PHEs

  • Gasket Damage: Water hammer can force gaskets out of plate grooves, causing leaks, particularly in PHEs with 0.4mm plates, which are highly susceptible to deformation
  • Plate Deformation: Pressure spikes can dent or puncture thin plates, compromising heat transfer and risking cross-contamination, as noted by Heat Exchanger Ontario.
  • Seal Failure: Spiking from rapid pressure changes (e.g., >150 psig/min) can break gasket bonds or deform grooves, leading to leaks
  • Reduced Lifespan: Repeated surges accelerate wear on plates and gaskets, shortening PHE lifespan, especially in high-pressure systems, as cautioned by industry standards.

Mitigation Strategies

  • Gradual Valve Operation: Open and close valves slowly during startup to prevent water hammer
  • Install Protective Devices: Use relief valves, pulsation dampers, or arrestors to absorb pressure spikes, per industry best practices.
  • Use Strainers: Upstream filters remove debris that exacerbates pressure issues, protecting PHEs
  • Regular Inspections: Monitor pressure drops (7–10 psi indicates fouling) and perform dye penetrant testing to detect plate damage

When to Service PHEs

Service PHEs every 5–6 years or when differential pressure reaches 7–10 psi, indicating fouling or potential damage from surges. Regular maintenance prevents escalation of water hammer or spiking issues.

Conclusion

Water hammer and pressure spiking can significantly damage plate and frame heat exchangers by affecting gaskets and plates, leading to leaks and reduced efficiency. Industry leaders like T.H. Industrial Solutions offer expert maintenance to mitigate these risks. Trust professionals to protect your PHEs and ensure optimal performance.

T.H. Industrial Solutions Inc. (THS) has been servicing industrial plate and frame heat exchangers as with shell and tube heat exchangers.  Professionally solving process problems across Canada since 2009. THS head office is located in Pickering, Ontario with a 6,000 square foot service center in Hamilton, Ontario.

Today there are fewer qualified people in this industry that know the products and understand the applications. Utilizing hands on experience and knowledge that has been gained by our THS sales and service technicians for over the past 30 years, we will take the time to understand what you require and strive to provide a prompt, educated and accurate response at a competitive price.

Our Heat Exchanger Cleaning Services, along with heat exchanger gasket replacement systems, and knowledge of heat exchanger gasket materials make THS your Industrial Heat Exchanger Service Solution

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HEAD OFFICE

1550 Bayly Street, Unit 15
Pickering, ON L1W 3W1

T 905 831-4963

SERVICE CENTER

76 Harlowe Road, Unit 4 - 7
Hamilton, ON L8W 3R6

T 905 318-0777
F 905-318-8422

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