Plate Heat Exchangers: Complete Guide to Types, Selection & Applications

Quick Answer

A plate heat exchanger (PHE) transfers heat between two fluids using corrugated metal plates stacked together to create alternating thin channels — achieving thermal efficiency up to 95% in a footprint 3-5× smaller than an equivalent shell and tube heat exchanger. Four main types exist: gasketed (most common, easy maintenance), brazed (compact and pressure-rated, no gaskets), welded (handles aggressive fluids and high pressures), and semi-welded (one side welded, one side gasketed — for aggressive-on-one-side applications like ammonia refrigeration). Standard materials are stainless 304/316L for most duties, titanium for seawater and chloride applications, with NBR/EPDM/Viton gaskets selected by temperature and fluid compatibility. Plate heat exchangers dominate food/beverage (pasteurization, dairy), HVAC, district heating, marine cooling, refrigeration, and pharmaceutical applications where their compact size, high efficiency, and easy cleaning outweigh their pressure and temperature limits compared to shell and tube designs.

A plate heat exchanger occupies 1 cubic meter where an equivalent shell and tube exchanger needs 4. It achieves 92-95% thermal efficiency where shell and tube reaches 60-70%. It can be opened, inspected, and the plates manually cleaned within a single shift — where shell and tube requires bundle pulling, mechanical cleaning, and 2-3 days of downtime. It uses 30-50% less heat transfer area for the same duty. It costs 30-40% less for the same throughput at moderate pressure.

For applications matching its design envelope — moderate pressures (under 25 bar typically), moderate temperatures (under 180°C for gasketed), clean fluids without large particulates — the plate heat exchanger is the right choice every time. Dairy plants pasteurizing milk, breweries handling wort and beer, HVAC systems exchanging heat between chiller loops and AHU coils, district heating networks serving thousands of homes, marine vessels cooling engine coolant with seawater, refrigeration systems exchanging refrigerant with secondary fluid — all of these are dominated by plate heat exchangers because the technology is genuinely better for the duty.

But plate heat exchangers are not interchangeable with shell and tube. Specifying a gasketed plate exchanger for refinery service at Class 600 (~100 bar) is impossible — the gaskets cannot seal at that pressure. Specifying any plate exchanger for fluids with significant particulates risks plugging the narrow channels within weeks. The selection between plate and shell and tube — and within plate, the selection between gasketed, brazed, welded, and semi-welded — requires understanding what each type does well and where it fails.

This guide covers all four major plate heat exchanger types, the materials and gaskets that define their performance envelope, sizing and selection methodology, applications across industries that use PHEs at scale, and specification details for procurement.

For complete coverage of all heat exchanger types and how plate fits among them, see our Heat Exchangers Pillar Guide. For the head-to-head comparison framework, see Shell & Tube vs Plate Heat Exchanger. For the shell and tube alternative when pressure/temperature exceeds PHE limits, see Shell & Tube Heat Exchangers: TEMA Types.

How a Plate Heat Exchanger Works

A plate heat exchanger consists of multiple thin corrugated metal plates stacked between a fixed frame plate and a movable pressure plate, compressed by tie bolts. The plates are pressed from sheet metal — typically 0.4-1.0mm thick — with corrugation patterns (chevron, herringbone) that simultaneously create flow channels and induce turbulence.

The complete heat transfer process:

1. Plate stacking. Plates are arranged alternately oriented (one plate "right-side up," the next "upside-down"), creating an alternating sequence of channels for the hot and cold fluids.

2. Gasket sealing (gasketed type) or welding/brazing. Between each plate, a gasket or weld/braze seals the periphery and directs flow into the correct channel.

3. Counter-flow operation. Hot fluid enters at the top of its channels and exits at the bottom; cold fluid enters at the bottom of its channels and exits at the top. The flows are countercurrent across the plate face.

4. Heat transfer through plates. Heat conducts through the thin plate metal from hot fluid to cold fluid. The corrugation patterns create turbulence that dramatically increases heat transfer coefficient compared to smooth surfaces.

5. Outlet. Each fluid exits through its own port, separated by gaskets or welds.

The key efficiency advantage: every plate surface is heat transfer area. In a shell and tube exchanger, the shell surface is structural — not heat transfer. In a plate exchanger, nearly 100% of the metal contributes to thermal duty.

Why Plate Exchangers Are More Efficient

Three physical mechanisms make plate exchangers more efficient than shell and tube:

1. True counter-flow. Plate exchangers achieve nearly pure countercurrent flow patterns. Shell and tube exchangers (especially multi-pass configurations) approximate countercurrent but include cross-flow components that reduce effectiveness.

2. Turbulence at low velocity. Corrugation patterns create turbulent flow at much lower fluid velocities than would be needed in tubes. Turbulent flow has dramatically higher heat transfer coefficient than laminar flow. The result: high heat transfer at modest pressure drop.

3. Thin metal barriers. Plate exchangers use 0.4-1.0mm plates; shell and tube uses tube walls of 1.5-3mm minimum. Thinner barriers = less thermal resistance.

The combined effect: typical overall heat transfer coefficient (U) of 3,000-7,000 W/m²·K for plate exchangers versus 500-2,000 W/m²·K for shell and tube. Three to five times higher U-value means three to five times less heat transfer area for the same duty.

The Four Main Plate Heat Exchanger Types

1. Gasketed Plate Heat Exchanger (GPHE)

The most common configuration. Plates are sealed by elastomeric gaskets, compressed by tie bolts between fixed and movable end frames.

Configuration:

• Plates: 10-700+ plates typical, depending on duty

• Gaskets: Glued or clip-on, around plate perimeter and ports

• Frame: Fixed plate, movable plate, tie bolts (4-6 bolts typical)

• Plate material: Typically 0.4-0.6mm pressed sheet

Operating range:

• Pressure: Up to 25 bar typical (some designs up to 30 bar)

• Temperature: -25°C to +180°C (limited by gasket material)

• Maximum size: Up to 4,000 m² heat transfer area per unit

Strengths:

• Easy maintenance — can be opened in hours for inspection, cleaning, plate replacement

• Expandable capacity — add or remove plates to adjust duty as process needs change

• Low fouling sensitivity — turbulent flow + smooth surfaces resist deposit buildup

• High efficiency — typical 90-95% thermal effectiveness

• Compact footprint — 3-5× smaller than equivalent shell and tube

• Lower fluid inventory — small channels mean less fluid contained (important for hazardous fluids)

Limitations:

• Pressure limit — gaskets restrict to ~25 bar (vs Class 600+ for shell and tube)

• Temperature limit — gasket materials top out around 180°C

• Gasket compatibility — must match every process fluid (cost and complexity)

• Cannot handle particulates — narrow channels (typically 3-5mm) plug with solids

• Periodic gasket replacement — typically every 5-10 years

Best for: Food/beverage, dairy, HVAC, district heating, marine cooling, light chemical processing, pharmaceutical (with sanitary gaskets), refrigeration secondary loops.

2. Brazed Plate Heat Exchanger (BPHE)

Compact, all-metal construction. Plates are vacuum brazed together using copper or nickel filler, with no gaskets and no removable plates.

Configuration:

• Plates: Typically 10-200 plates

• Brazing: Copper brazed (standard) or nickel brazed (for ammonia, chlorides, fresh water service)

• No gaskets, no tie bolts, no frame plates

• Fully sealed unit

Operating range:

• Pressure: Up to 45 bar typical, some to 65 bar

• Temperature: -195°C to +225°C (limited by braze material)

• Maximum size: Up to 250 kW typical duty

Strengths:

• Most compact — typically 50% smaller than equivalent gasketed PHE

• Higher pressure — no gasket pressure limit

• No gaskets — eliminates gasket replacement and compatibility issues

• Lower cost at small sizes — manufacturing economics favor BPHE under ~100 kW duty

• Hermetically sealed — no external leak path

• Suitable for refrigerants — preferred for refrigeration evaporators and condensers

Limitations:

• Cannot be opened — no maintenance access, must be replaced if fouled or damaged

• Limited size range — most BPHEs are smaller than 50 m² heat transfer area

• Brazing material compatibility — copper braze incompatible with ammonia, seawater, some chemicals (nickel braze required for these)

• No expandability — sized at manufacture, cannot adjust capacity

Best for: Refrigeration evaporators and condensers, heat pumps, oil cooling, district heating substations (smaller residential/commercial), chiller plate exchangers, hydraulic oil coolers.

3. Welded (Fully Welded) Plate Heat Exchanger

All-welded construction with no gaskets. Plates are laser-welded together to form the complete plate pack, then mounted in a frame for support.

Configuration:

• Plates: 20-500+ plates

• Welding: Laser welds around perimeter and ports

• Frame: Structural support, not pressure-bearing

• Some designs allow shell removal for limited access

Operating range:

• Pressure: Up to 100 bar (Class 600 equivalent)

• Temperature: Up to 350°C (varies with materials)

• Materials: Any weldable metal

Strengths:

• High pressure capability — handles refinery and petrochemical service

• High temperature capability — exceeds gasketed PHE range

• Aggressive fluid compatibility — no gasket limitations

• Combines efficiency of plate design with shell-and-tube pressure capability

Limitations:

• Cannot be opened for cleaning (some designs have limited access)

• Higher cost than gasketed at equivalent size

• Repair complexity — welded plates difficult to replace

• Specialized manufacturing — fewer suppliers offer welded PHEs

Best for: Oil and gas processing (refinery cooling), chemical processing with aggressive fluids, high-pressure steam condensation, applications where shell and tube would work but plate efficiency is needed.

4. Semi-Welded Plate Heat Exchanger

Hybrid design with one side welded and one side gasketed. The welded side handles aggressive or high-pressure fluid; the gasketed side handles cleaner fluid that may need maintenance access.

Configuration:

• Pairs of plates welded together (forming "cassettes")

• Cassettes assembled like a gasketed PHE

• One fluid passes through welded channels (aggressive side)

• Other fluid passes through gasketed channels (service side)

Operating range:

• Pressure: Up to 40 bar typical

• Temperature: Up to 200°C (limited by gaskets on one side)

Strengths:

• Handles one aggressive fluid without gasket compatibility issues

• Maintenance access to the gasketed side

• Suitable for ammonia refrigeration (welded ammonia channels + gasketed brine/water channels)

• Compromise between gasketed and welded — combines benefits of each

Limitations:

• More complex than pure gasketed

• Higher cost than gasketed

• Limited to specific applications where the one-aggressive-fluid pattern fits

Best for: Ammonia refrigeration (NH₃ is incompatible with most gasket materials), chemical processing with one corrosive stream, refrigeration secondary loops where one side is aggressive refrigerant and the other is water/brine.

Quick Comparison Table

Plate Materials

The plate material is selected based on fluid compatibility, temperature, and chloride content:

Stainless Steel 304 (SUS304)

The default material for general service.

Use for:

• Water-to-water duties

• Mild process fluids

• Air conditioning and refrigeration secondary loops

• General HVAC

Limitations:

• Chloride sensitivity (stress corrosion cracking above 50 ppm chlorides at 60°C+)

• Not for seawater

• Limited resistance to most acids

Stainless Steel 316L (SUS316L)

The standard material for food, pharma, and most industrial applications.

Use for:

• Food and beverage applications (pasteurization, dairy, brewing)

• Pharmaceutical manufacturing

• General industrial duties

• Light chemical service

• Higher chloride water (up to ~500 ppm)

Advantages over 304: Added molybdenum (~2-3%) provides better chloride resistance and weldability.

For complete coverage of stainless steel material selection, see Stainless Steel Plate: Grades 304, 316, 321.

Titanium

Premium material for seawater and high-chloride applications.

Use for:

• Seawater heat exchangers (marine, offshore)

• Brackish water cooling

• High-chloride chemical service

• Pulp and paper bleaching

• Pharmaceutical chloride-bearing solutions

Advantages: Effectively immune to chloride corrosion at any concentration. Long service life in seawater (30+ years).

Limitation: 4-6× the cost of 316L.

Nickel Alloys (Hastelloy, Inconel)

Specialty materials for severe chemical service.

Use for:

• Severe corrosive chemicals

• Oxidizing environments

• High-temperature aggressive fluids

• Sulfuric acid, hydrochloric acid (specific grades)

Cost: 8-15× of 316L. Used only where corrosion mandates.

SMO 254 / 904L (Super Austenitic)

Intermediate between 316L and titanium.

Use for:

• Moderate chloride service (500-3000 ppm)

• Light seawater duties (cooler temperatures)

• Some chemical service

Cost: 2-3× of 316L.

Gasket Materials (For Gasketed Plate Exchangers)

The gasket material must match the fluid chemistry AND the temperature range:

Gasket Selection Critical Points

Gasket attachment methods:

• Glued — bonded to the plate; reliable seal but more difficult to replace

• Clip-on — mechanical attachment; faster replacement but slightly less robust

FDA approval: For food applications, gaskets must be FDA-approved compounds (specific NBR, EPDM grades).

Steam compatibility: EPDM for steam service; NOT NBR (degrades).

Refrigerant compatibility: HNBR or specific compounds for HFC, HFO refrigerants; nitrile for some older refrigerants.

Applications by Industry

Food & Beverage

Most common application for plate heat exchangers globally. Reasons:

• Sanitary stainless construction

• Easy opening and cleaning (CIP, COP procedures)

• High thermal efficiency (energy savings)

• Compact (food plant space is at a premium)

• FDA-approved materials available

Typical applications:

• Pasteurization (milk, juice, beer) — heat to 72-85°C, regenerate energy with countercurrent cold inlet

• Dairy cooling and heating — chilled water heat exchange with milk, cream

• Brewery wort cooling — 95°C wort cooled to 8-15°C with cold water or glycol

• Hot water generation — process water heating from steam

• CIP heating — cleaning solution heating

• Beverage carbonation cooling — chilled beverages before bottling

Standard configuration: Gasketed PHE with 316L plates and EPDM (food-grade) gaskets, sanitary connections.

HVAC and District Heating

Plate exchangers dominate hydronic HVAC systems.

Typical applications:

• Chiller plate exchangers — refrigerant-to-water heat exchange

• District heating substations — primary network hot water heated by central plant, secondary heats building loops

• Hot water heating — steam-to-water heating for building heating systems

• Heat recovery — building exhaust air to fresh air heat exchange

• Pool heating — solar or boiler heating of swimming pool water

• Cooling tower heat exchange — process water vs cooling tower loop

Why plate dominates: Energy efficiency (lower utility cost), space efficiency (smaller mechanical rooms), modular sizing (different building sizes), serviceability.

Standard configuration: Gasketed PHE with 316L plates and EPDM gaskets, or brazed PHE for smaller residential/commercial substations.

Refrigeration

Brazed PHEs dominate refrigeration applications.

Typical applications:

• Evaporators — refrigerant-to-water heat exchange (chillers)

• Condensers — refrigerant-to-water heat exchange

• Economizers — refrigerant subcooling/desuperheating

• Oil coolers — compressor oil cooling

• Cascade refrigeration — heat transfer between refrigeration loops

Standard configuration: Copper-brazed BPHE for HFC/HFO refrigerants; nickel-brazed for ammonia (NH₃ is incompatible with copper).

Ammonia Refrigeration (Special Case)

Ammonia refrigeration uses NH₃ which is highly aggressive to copper-brazed BPHEs.

Solution: Either nickel-brazed BPHE, or semi-welded PHE where ammonia flows through welded channels and water/brine through gasketed channels.

Marine Applications

Seawater cooling on ships requires titanium plates.

Typical applications:

• Main engine cooling (seawater to fresh water heat exchange)

• Auxiliary cooling

• HVAC cooling (large vessels)

• Lubricating oil cooling

Standard configuration: Gasketed PHE with titanium plates and EPDM/Viton gaskets for seawater service.

Chemical Processing

Plate exchangers handle chemical duties where pressure and temperature stay within their envelope.

Typical applications:

• Process fluid cooling/heating below 200°C

• Solvent recovery (with appropriate gaskets)

• Acid duties (with corrosion-resistant materials)

• Polymer manufacturing intermediates

Material selection: Often 904L, SMO 254, or Hastelloy for aggressive chemicals; titanium for chloride.

Pharmaceutical

Sanitary plate exchangers for pharmaceutical manufacturing.

Typical applications:

• WFI (Water for Injection) cooling

• Process water heating/cooling

• Clean steam condensation

• Buffer solution temperature control

Standard configuration: Sanitary plate exchanger with 316L plates, FDA-approved gaskets (typically EPDM), polished plates (Ra <0.5 μm), drainable design.

Oil & Gas (When Plate Is Appropriate)

Most oil and gas service requires shell and tube due to high pressures and harsh fluids. Plate exchangers are used selectively for:

Typical applications:

• Compressor oil cooling (welded PHE)

• Glycol heating systems

• Some downstream processing duties

• Closed-loop cooling water

Configuration: Welded plate heat exchanger for higher pressure/temperature; shell and tube for refinery process service.

For the alternative when plate exchangers don't fit the operating envelope, see Shell & Tube Heat Exchangers: TEMA Types.

Sizing a Plate Heat Exchanger

Sizing a plate heat exchanger follows the standard heat exchanger design equation:

Q = U × A × LMTD × F

Where:

• Q = heat duty (kW)

• U = overall heat transfer coefficient (W/m²·K)

• A = heat transfer area (m²)

• LMTD = log mean temperature difference (°C)

• F = correction factor (typically 0.95-1.0 for plate exchangers due to near-pure counter-flow)

Step 1: Define Process Conditions

Required:

• Hot fluid: type, flow rate, inlet temperature, outlet temperature, properties

• Cold fluid: type, flow rate, inlet temperature, outlet temperature, properties

• Operating pressure (both sides)

• Design pressure (both sides)

• Maximum allowable pressure drop

• Fluid fouling tendency

Step 2: Calculate Heat Duty

Q = m × Cp × ΔT

Where:

• m = mass flow rate (kg/s)

• Cp = specific heat capacity (J/kg·K)

• ΔT = temperature change

Heat duty calculated from hot side or cold side should match (energy balance).

Step 3: Determine LMTD

LMTD = (ΔT_max - ΔT_min) / ln(ΔT_max / ΔT_min)

For nearly pure counter-flow plate exchangers, F-factor is typically 0.95-1.0.

Step 4: Estimate U (Iterative Sizing)

Typical U-values for plate heat exchangers:

Step 5: Calculate Required Area

A = Q / (U × LMTD × F)

This gives the required heat transfer area, which determines the number of plates needed.

Step 6: Select Plate Pattern and Pressure Drop Optimization

Plate corrugation patterns affect both U-value and pressure drop:

• Low-theta plates — deeper corrugation, higher turbulence, higher U, higher pressure drop

• High-theta plates — shallower corrugation, less turbulence, lower U, lower pressure drop

• Mixed plates — different patterns in same exchanger

For most applications, a mix of plate types optimizes the design for the specific pressure drop and U-value targets.

Complete Sizing Example

Application: Dairy plant milk pasteurization, 50,000 L/hr milk heated from 4°C to 75°C using hot water at 90°C cooling to 8°C (regenerative section achieves preheat to 65°C, this duty is the final heating from 65°C to 75°C).

Equipment recommendation: Gasketed PHE, 316L plates, EPDM food-grade gaskets, sanitary connections, drainable frame, 20-plate frame (allowing future expansion).

Specification Template

PROJECT: [Project Name]
APPLICATION: Plate heat exchanger
LOCATION: [Country, Facility]

PROCESS DETAILS:
- Hot fluid: [Type, source]
- Hot inlet temperature: [°C]
- Hot outlet temperature: [°C]
- Hot fluid flow rate: [kg/s or m³/h]
- Hot side fouling resistance: [m²·K/W]

- Cold fluid: [Type, source]
- Cold inlet temperature: [°C]
- Cold outlet temperature: [°C]
- Cold fluid flow rate: [kg/s or m³/h]
- Cold side fouling resistance: [m²·K/W]

DESIGN CONDITIONS:
- Operating pressure (hot side): [bar]
- Operating pressure (cold side): [bar]
- Design pressure (hot side): [bar]
- Design pressure (cold side): [bar]
- Maximum allowable pressure drop (each side): [kPa]

EQUIPMENT TYPE:
- Configuration: [Gasketed / Brazed / Welded / Semi-welded]
- Required heat duty: [kW]
- Required heat transfer area: [m²]
- Number of plates: [estimated]

MATERIALS:
- Plate material: [304 / 316L / Titanium / 904L / SMO 254 / Hastelloy]
- Plate thickness: [0.4 / 0.5 / 0.6mm]
- Gasket material (if gasketed): [NBR / EPDM / HNBR / Viton / FFKM]
- Frame material: [Carbon steel painted / 304 / 316]
- Connection material: [Match frame or specify]

CONNECTIONS:
- Type: [Flanged / Threaded / Sanitary]
- Size: [DN]
- Pressure class: [PN / ASME]
- Material: [Match plate or specify]

INDUSTRY-SPECIFIC:
- Food/pharma: [FDA-approved gaskets, polished plates]
- Marine: [Titanium plates, marine certifications]
- Refrigeration: [Specific refrigerant compatibility]

CODE COMPLIANCE:
- Pressure vessel code: [ASME Section VIII Div 1 / PED / Other]
- Material certificates required: [Yes/No]
- Hydrostatic test: [Required - to what pressure]

CONFIGURATION OPTIONS:
- Drainable frame: [Yes/No]
- Inspection ports: [Required]
- Insulation: [Required - thickness, material]
- Spare plates included: [Quantity]
- Spare gaskets included: [Quantity]

DOCUMENTATION REQUIRED:
- General arrangement drawing
- Thermal calculation sheet
- Pressure drop calculation
- Material test certificates (EN 10204 Type 3.1)
- ASME data sheets (if applicable)
- Welding procedure qualifications (for welded designs)
- Hydrostatic test certificate
- Final assembly drawings
- Spare parts list with current pricing
- Operation and maintenance manual

DELIVERY:
- Required date: [Date]
- Shipping terms: [FOB / CIF / DDP]
- Delivery location: [Full address]

Common Specification Mistakes

After 15+ years supplying heat exchanger equipment to industrial and process customers:

Mistake 1: Plate PHE for Application Beyond Pressure Envelope

Buyer specifies gasketed PHE for application at 35 bar operating pressure. Gaskets cannot reliably seal above 25 bar in extended service; the gaskets fail repeatedly, the unit leaks, and gasket replacement frequency exceeds normal maintenance windows.

Prevention: For pressures above 25 bar, specify welded PHE (up to ~100 bar) or shell and tube (no practical limit). Never push gasketed PHE beyond its envelope.

Mistake 2: Wrong Gasket Material

Buyer specifies NBR gaskets for steam service. NBR degrades rapidly above 100°C in steam; gaskets harden, lose elasticity, and begin leaking within months.

Prevention: Match gasket to fluid and temperature precisely. EPDM for steam and food water; Viton for chemicals and hot oils; HNBR for refrigerants. Reference fluid Material Safety Data Sheet when specifying.

Mistake 3: Ignoring Fouling Sensitivity

Buyer specifies plate exchanger for fluid with significant particulates (e.g., process water with 200 ppm suspended solids). Particulates accumulate in the narrow channels; pressure drop climbs; channels eventually plug; cleaning becomes constant.

Prevention: For fouling fluids or fluids with particulates, either: (1) install upstream filtration to remove particulates, (2) specify wide-gap plate exchanger designed for fouling service, (3) consider shell and tube instead.

Mistake 4: Specifying SS304 for Chloride Application

Buyer specifies 304 plates for application with 100+ ppm chlorides at elevated temperature. Within 1-2 years, stress corrosion cracking appears at plate corrugations; plates fail and require replacement.

Prevention: Above 50 ppm chlorides at >60°C, specify 316L minimum. Above 500 ppm, specify titanium or SMO 254. For seawater, titanium is mandatory regardless of pressure/temperature.

Mistake 5: No Allowance for Future Expansion

Buyer specifies gasketed PHE with frame exactly sized for current duty. Process changes increase capacity by 30%; the existing frame cannot accept additional plates; complete replacement required.

Prevention: For gasketed PHE applications, specify frame sized 20-30% larger than current need. The additional cost is minimal; the future flexibility is significant.

Mistake 6: Wrong Brazing Material for Refrigerant

Buyer specifies copper-brazed BPHE for ammonia refrigeration. Copper is rapidly attacked by ammonia; the brazed joints fail; the exchanger leaks ammonia (which is toxic).

Prevention: For ammonia refrigeration, specify nickel-brazed BPHE or semi-welded PHE (with ammonia on welded side). Never copper-brazed for ammonia service. Verify brazing material with manufacturer specifications.

Mistake 7: Ignoring Pressure Drop Budget

Buyer specifies PHE with minimum heat transfer area to reduce cost. Resulting pressure drop is 80 kPa, but pump can only deliver 50 kPa across the exchanger. System cannot operate at design flow rate.

Prevention: Verify pressure drop on both sides matches available pump head. For gasketed PHE, use lower-theta plates if pressure drop is constrained. Verify the specification against pump curves.

Supply from Kasko Makine

Kasko Makine supplies plate heat exchangers for food/beverage, HVAC, district heating, refrigeration, marine, pharmaceutical, chemical processing, and oil & gas applications:

Equipment configurations:

• Gasketed Plate Heat Exchangers — General industrial, food, HVAC, district heating

• Brazed Plate Heat Exchangers — Refrigeration, heat pumps, smaller HVAC

• Welded Plate Heat Exchangers — Aggressive fluids, high pressure/temperature

• Semi-Welded Plate Heat Exchangers — Ammonia refrigeration, specific aggressive applications

Sizing range:

• Gasketed: 1-4,000 m² heat transfer area

• Brazed: Up to 50 m² (small to medium duties)

• Welded: 5-1,000 m²

• Semi-welded: 10-1,000 m²

Materials:

• Plates: SS304, SS316L, Titanium, SMO 254, 904L, Hastelloy (specific applications)

• Plate thickness: 0.4mm, 0.5mm, 0.6mm

• Gaskets: NBR, EPDM (including FDA-approved), HNBR, Viton/FKM, FFKM

• Frames: Carbon steel (painted), 304 SS, 316 SS

Industries served:

• Food/beverage — Dairy, brewery, beverage, juice processing

• HVAC — Chilled water systems, hot water heating

• District heating — Primary and secondary loop heat exchange

• Refrigeration — Evaporators, condensers, oil coolers

• Marine — Engine cooling, seawater-to-fresh water

• Pharmaceutical — WFI cooling, sanitary applications

• Chemical processing — Various aggressive fluids

• Power generation — Auxiliary cooling, lube oil cooling

Documentation per shipment:

• Thermal design calculation

• General arrangement drawings

• Material test certificates (EN 10204 Type 3.1)

• Hydrostatic test certificate

• ASME data sheets (where applicable)

• PED compliance documentation (for European projects)

• Welding procedure qualifications (for welded designs)

• Plate and gasket specifications

• Operation and maintenance manual

• Spare parts list with pricing

Engineering services:

• Thermal and hydraulic design

• Material selection per fluid chemistry

• Gasket selection per fluid and temperature

• Plate pattern optimization (low-theta vs high-theta)

• Sanitary design for food/pharma applications

• Marine certifications coordination

• ATEX certification (for hazardous areas)

Spare parts and aftermarket support:

• Spare plates (matching original specification)

• Spare gaskets (compatible with installed equipment)

• Replacement bolts and frame components

• On-site service for installation and maintenance training

• Plate refurbishment (for specific damaged plates)

Need a plate heat exchanger? Send us your duty (kW), fluid types, flow rates, inlet/outlet temperatures, operating pressures, fluid fouling tendencies, and any sanitary or special requirements to info@kaskomakine.com or WhatsApp +90 (537) 521 1399. Our thermal design team will recommend the optimal configuration, materials, and gasket selection, and provide a complete quotation within 48 hours. We deliver to projects across Africa, the Middle East, Central Asia, and beyond.

Continue Reading: Heat Exchanger Series

This plate heat exchanger guide is part of our comprehensive heat exchanger series:

• Heat Exchangers: 6 Types, Working Principles & Selection Guide — The master pillar covering all heat exchanger types

• Shell & Tube vs Plate Heat Exchanger — Head-to-head comparison guide for choosing between the two main types

• Shell & Tube Heat Exchangers: TEMA Types — Shell and tube deep-dive (the alternative for high-pressure/aggressive service)

• Expansion Joints: Types, Materials & Applications — Critical accessory for piping systems

• Stainless Steel Plate: Grades 304, 316, 321 — Materials for corrosion-resistant heat exchanger plates

FAQ SCHEMA

Q: What is a plate heat exchanger and how does it work?
A: A plate heat exchanger (PHE) is a heat transfer device that uses corrugated metal plates stacked together to create alternating channels for two fluids. Heat conducts through the thin plates from the hot fluid to the cold fluid. The corrugation patterns create turbulence at low velocities, dramatically increasing heat transfer coefficient (typically 3,000-7,000 W/m²·K, three to five times higher than shell and tube). The plates achieve nearly true countercurrent flow, providing thermal efficiency up to 95%. The compact stack design produces heat transfer equipment 3-5× smaller than equivalent shell and tube exchangers.

Q: What are the main types of plate heat exchangers?
A: Four main types of plate heat exchangers exist. Gasketed plate heat exchangers (GPHE) use elastomeric gaskets between plates — easy maintenance, expandable, suitable for pressures up to 25 bar and temperatures up to 180°C. Brazed plate heat exchangers (BPHE) are permanently brazed with copper or nickel — compact, sealed, suitable for 45 bar and 225°C, no maintenance access. Welded plate heat exchangers are laser-welded for high pressure (up to 100 bar) and temperature (up to 350°C) — used for aggressive fluids. Semi-welded plate heat exchangers combine welded channels for aggressive fluid with gasketed channels for serviceability — common in ammonia refrigeration.

Q: When should I use a plate heat exchanger vs a shell and tube heat exchanger?
A: Plate heat exchangers are preferred when: (1) Pressure is below 25 bar (gasketed) or 100 bar (welded), (2) Temperature is below 180-200°C (gasketed) or 350°C (welded), (3) Fluids are relatively clean (no large particulates), (4) Compact size matters (food plants, ships, building plant rooms), (5) High thermal efficiency is needed, (6) Easy maintenance is required (food, pharma cleaning). Shell and tube heat exchangers are preferred for refinery process service, very high pressures, very high temperatures, fluids with significant particulates, or where 30+ year service life with minimal capital investment matters.

Q: What materials are used in plate heat exchangers?
A: Plate materials are selected based on fluid chemistry and chloride content. Stainless 304 is used for general water service and mild duties. Stainless 316L is the standard for food, pharmaceutical, and most industrial applications (handles up to ~500 ppm chlorides). Titanium is mandatory for seawater and high-chloride applications (effectively immune to chloride corrosion). SMO 254 or 904L handle moderate chloride service. Hastelloy and Inconel are used for severe chemical service. Gasket materials include NBR (general water/oil to 135°C), EPDM (water/steam/food to 160°C), HNBR (refrigerants), Viton/FKM (chemicals to 200°C), and FFKM (severe service).

Q: What is the typical efficiency of a plate heat exchanger?
A: Plate heat exchangers achieve thermal efficiency typically 90-95% — significantly higher than the 60-70% typical of shell and tube exchangers. This high efficiency results from three physical mechanisms: (1) Nearly pure countercurrent flow patterns achieved by the plate-stack design, (2) Turbulence created by corrugation patterns at low fluid velocities, (3) Thin metal plates (0.4-1.0mm) providing minimal thermal resistance compared to thicker tube walls. The combined effect produces overall heat transfer coefficients (U) of 3,000-7,000 W/m²·K versus 500-2,000 W/m²·K for shell and tube — three to five times higher.

Q: Can plate heat exchangers handle high pressures?
A: Pressure capability varies by plate heat exchanger type. Gasketed plate heat exchangers are limited to approximately 25 bar (some designs up to 30 bar) due to gasket sealing limits. Brazed plate heat exchangers handle up to 45 bar with some designs reaching 65 bar. Welded plate heat exchangers can operate up to 100 bar (Class 600 equivalent). For applications above 100 bar — refinery process, hydrogen service, high-pressure gas processing — shell and tube heat exchangers are typically the appropriate choice. The pressure capability is the primary differentiator between plate and shell and tube technologies.

Q: How long do plate heat exchanger gaskets last?
A: Plate heat exchanger gaskets typically last 5-10 years in standard service, depending on fluid chemistry, temperature, and operating conditions. Gasket life is shortest in harsh chemical service (1-3 years for aggressive duty) and longest in clean water service (10+ years). EPDM gaskets in food and beverage applications typically last 5-7 years with regular CIP cleaning cycles. Viton/FKM gaskets in chemical service typically last 3-5 years. When specifying a gasketed plate heat exchanger, plan for periodic gasket replacement and verify the manufacturer can supply replacement gaskets through the equipment's full service life (typically 20-30 years).