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Plate & Gaskets | Data Sheets

Alfa Laval T20B.

Alfa Laval T20B

DATA SHEET

Alfa Laval T20B

Plate heat exchanger

General heating and cooling duties.

Typical capacities

Liquid flow rate
Up to 225 kg/s (3600 gpm), depending on media, permitted pressure drop and temperature program.

Plate types
T20B plates

Frame types
FM, FG and FS

Standard Materials

Frame plate
Mild steel, Epoxy painted

Nozzles
Carbon steel
Metal-Lined: Stainless steel, Titanium

Plates
Stainless steel Alloy 304, Stainless steel Alloy 316, Alloy C-276 or Titanium

Gaskets
Nitrile or EPDM

Technical Data

Mechanical design pressure (g) / temperature
FM pvcALS™ 1.0 MPa / 180°C
FG pvcALS™ 1.6 MPa / 180°C
FG PED 1.6 MPa / 180°C
FG ASME 150 psig / 350°F
FS PED 3.0 MPa / 160°C
FS ASME 400 psig / 320°F

Connections

FM pvcALS™ Size 200 mm DIN PN10/JIS 10K
Size 8" ASME Cl. 150
FG pvcALS™ Size 200 mm DIN PN16/JIS 16K
Size 8" ASME Cl. 150
FG PED Size 200 mm DIN PN10/16
FG ASME Size 8” ASME Cl. 150
FS PED Size 200 mm DIN PN25/40
FS ASME Size 8” ASME Cl. 300/400

Maximum heat transfer surface
630 m² (17000 sq. ft)

Measurements mm (inch)
Type H W h
T20-FM 2145 (84 ½") 780 (30 11/16") 285 (11 7/32)
T20-FG 2145 (84 ½") 780 (30 11/16") 285 (11 7/32)
T20-FS 2183 (84 ½") 780 (30 11/16") 323 (12 11/16)

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WHEN SHOULD A PLATE & FRAME HEAT EXCHANGER BE SERVICED?

As a heat exchanger becomes fouled with dirt, debris or scale, often the modulating valve provides additional hot or cold liquid to help compensate for the loss of efficiency of the heat exchanger.

Over time the control valve will continue to open fully. Unfortunately, on the hottest or coldest days, even with the valve fully open the heat exchanger cannot meet the thermal transfer requirements and the situation becomes critical.

Monitoring just the operating temperature provides a false sense of security. Recording the difference in the outlet and inlet pressures provides a more accurate result of the amount of fouling.

Fouling equal to the thickness of a piece of paper represents a 20% loss of thermal efficiency. In addition, the energy cost for pumps increases since the pump must work harder to overcome the increased pressure resistance through the PHE

Can Double Wall Plate & Frame PHEs Be Cleaned or Serviced?

Double wall plate and frame heat exchangers (PHEs) are specialized systems designed to prevent cross-contamination, making them ideal for applications like potable water, food processing, and pharmaceuticals.

A common question is: Can double wall plate & frame PHEs be cleaned or serviced?

Yes, double wall PHEs can be effectively cleaned and serviced using methods like Clean-in-Place (CIP), chemical flushing, or mechanical cleaning, ensuring efficiency and compliance with safety standards.

What Are Double Wall PHEs?

Double wall PHEs feature two plates between fluid channels, providing a failsafe against leaks and cross-contamination, as highlighted by T.H. Industrial Solutions. If a plate develops a pinhole or crack, the double wall design prevents fluid mixing, making them critical for potable water systems under municipal codes, as noted in industry standards.

How Are Double Wall PHEs Cleaned and Serviced?

Cleaning and servicing double wall PHEs involve tailored methods to maintain their integrity:

Clean-in-Place (CIP): Alfa Laval and Hofmann Heat Exchanger endorse CIP systems, circulating cleaning solutions like citric acid or sodium hydroxide to remove scale or organic deposits without disassembly, ideal for routine maintenance.
Chemical Flushing: Heat Exchanger Ontario uses portable units with pumps and filters to circulate mild acid or citrus-based solutions for 6–8 hours, effectively clearing debris, though less effective for hardened scale.
Mechanical Cleaning: For severe fouling, plates are disassembled and cleaned with high-pressure water or soft brushes, ensuring no damage to plates or gaskets.
Inspection and Testing: Post-cleaning, dye penetrant testing, used by T.H. Industrial Solutions, detects cracks or pinholes to ensure reliability.

Effectiveness of Cleaning Double Wall PHEs

Restores Efficiency: Cleaning removes scale and biofilms, reducing pressure drops (7–10 psi indicates service need) and improving heat transfer.
Ensures Safety: Servicing maintains the double wall’s protective barrier, critical for potable water.
Prolongs Lifespan: Regular maintenance, prevents corrosion and gasket wear, ensuring compliance with regulations.

Limitations and Considerations

Material Compatibility: Cleaning agents must suit plate and gasket materials to avoid corrosion.
Severe Fouling: Hardened scale may require disassembly and mechanical cleaning, increasing labor compared to CIP, per industry standards.
Environmental Compliance: Spent chemicals must be neutralized.
Expertise Required: Services from T.H. Industrial Solutions ensure safe cleaning and proper flow rates (e.g., 1 ft/sec).

When to Clean or Service Double Wall PHEs

Service is recommended every 5–6 years or when differential pressure reaches 7–10 psi, indicating fouling. Double wall PHEs in potable water systems require regular maintenance to meet municipal codes, ensuring no cross-contamination risks.

Conclusion

Double wall plate and frame PHEs can be effectively cleaned and serviced using CIP, chemical flushing, or mechanical methods, maintaining efficiency and safety. Industry leaders like T.H. Industrial Solutions provide expert services tailored to double wall PHEs. Trust professionals to ensure compliance and 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

Contact THS SERVICE

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