When should I switch from gasketed to fully welded?

Whenever the medium attacks elastomers (hydrocarbons, refrigerants, some solvents), the operating temperature exceeds gasket limits (~180 °C), or the design pressure exceeds gasketed-frame ratings.

Yes — by CIP (clean-in-place) with chemistry matched to the fouling. Mechanical cleaning is not possible.

Is it cheaper than a shell-and-tube exchanger?

For the same duty and area, the welded plate unit is usually more compact and lighter, and at moderate areas it is cost-competitive. Above very large areas or with very dirty fluids, shell-and-tube becomes more economic.

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Industrial Heat Exchanger

Fully Welded Plate Heat Exchanger

Laser-welded plate cassettes eliminate elastomer limitations, enabling service with hydrocarbons, refrigerants and high-temperature process fluids.

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Fully Welded Plate Heat Exchanger / 全焊接板式换热器

Typical applications

Hydrocarbon processing
Refrigerants
High-temperature duties

Specified per duty

· Plate / tube material
· Design pressure & temperature
· Connection type and size
· Code and certification

Overview

A Fully Welded Plate Heat Exchanger replaces the elastomer gaskets of a gasketed unit with laser-welded plate cassettes, removing the temperature, pressure and chemical compatibility limits imposed by rubber. The plate pack remains a compact corrugated geometry, so the high U-value characteristic of plate technology is preserved.

Common configurations include block-type welded exchangers (used for hydrocarbons, refrigerants and aggressive chemicals), plate-and-shell exchangers (welded plate pack inside a cylindrical pressure shell), and welded-cassette plate exchangers where alternate channels are welded and the rest remain gasketed for inspection access.

Welded plate units are typically selected when a gasketed unit cannot meet the temperature, pressure or chemical compatibility of the service, but the customer still wants the compactness and efficiency of plate technology rather than the size and cost of a shell-and-tube exchanger.

Operating Conditions

Design pressure	Up to 6.3 MPa (63 bar), higher on plate-and-shell variants
Design temperature	−50 °C to +350 °C (depending on construction)
Heat transfer area	Up to 1,500 m² per unit
Typical duties	Liquid/liquid, gas/liquid, condensation, vaporization

Materials of Construction

Plates	AISI 316L, 904L, 254 SMO, titanium, SAF 2205/2507 duplex, nickel alloys
Shell / frame	Carbon steel, stainless, low-temperature carbon steel
Welds	Laser-welded plate edges, TIG-welded shell components, full radiographic inspection on pressure boundary

Selection Parameters

Information our engineering team uses to size and quote this unit.

Full medium specification on both sides, including impurities
Operating and design temperatures, including transients
Operating and design pressures
Required duty, including any phase change and inlet vapor fraction
Code requirements (PED, ASME, GB) and inspection class
Cleaning strategy (CIP chemistry and frequency)

RFQ Data Checklist

Send the items below with your inquiry for the fastest accurate quotation.

Process description and PFD / P&ID if available
Stream compositions on both sides
Operating and design conditions (T, P, flow, duty)
Phase change details (inlet/outlet vapor fraction, latent heat)
Materials of construction preferred or required

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Industry Cases

Hydrocarbon interchanger

Crude pre-heat train interchanger in a small refinery — replaced a shell-and-tube exchanger with a much smaller footprint.

Refrigerant condenser

Block-welded condenser on an industrial refrigeration plant using ammonia / CO₂ cascade.

Aggressive chemical cooler

254 SMO welded plate cooler on a chloride-containing process stream where stainless gasketed units would have failed.

Fully Welded vs Gasketed Plate Heat Exchanger

When the duty exceeds gasket limits — hydrocarbons, refrigerants, high temperature, high pressure — the welded plate exchanger keeps the compactness and U-value of plate technology while removing the elastomer.

	Fully Welded Plate	Gasketed Plate
Pressure boundary	Laser-welded plate cassettes — no elastomer	Elastomer gaskets between every plate pair
Max design pressure	Up to 63 bar (higher on plate-and-shell)	Typically up to 25 bar
Max design temperature	−50 °C to +350 °C	≈ +180 °C, gasket-limited
Compatible media	Hydrocarbons, refrigerants, solvents, aggressive chemicals	Water, glycols, oils, mildly aggressive chemicals (gasket-dependent)
Phase change	Suited to condensers, vaporizers, reboilers	Liquid/liquid only — limited vaporization capability
Cleaning	CIP only — not openable	Fully openable for mechanical cleaning and gasket replacement
Repair	Shop welding by qualified personnel	Field-replaceable plates and gaskets
Best-fit duties	Refinery, petrochemical, refrigeration condensers, high-T process	District heating, dairy/food, HVAC, clean process cooling