INDUSTRIAL SAFETY

Welded Plate Heat Exchanger Pressure Testing Guide

Welded plate heat exchanger pressure testing is essential for ensuring safe and reliable operation. These heat exchangers are widely used in chemical processing, power generation, pharmaceuticals, and food industries due to their high efficiency, strong sealing performance, and pressure resistance.

Published · 2026 / 04 / 20

Safety Assurance

Technical Guide

Welded plate heat exchangers combine high efficiency, superior sealing, and high-pressure capability — making them ideal for demanding industrial environments.

However, a critical engineering question remains: how is pressure testing performed on welded plate heat exchangers with six-side removable covers?

1. Understanding the Structural Design

The welded plate pack is fully sealed to ensure maximum pressure resistance and zero internal leakage risk.

The six-side removable cover design allows full access for inspection, cleaning, and maintenance without compromising structural integrity.

Key Engineering Value: High-pressure integrity + field serviceability in one system design

2. Pressure Testing Preparation

Test Medium & Pressure

Water (hydro test) or nitrogen (pneumatic test)
1.25–1.5 × design pressure

System Isolation

Blind all unused nozzles
Ensure single-side pressurization accuracy

Air Removal

Vent air for hydro testing
Slow pressurization for pneumatic testing

Safety Control

Controlled pressure ramp-up
Avoid hydraulic shock or sudden load

3. Pressure Testing Procedure

Step 1 — Independent Side Testing
Each flow channel is tested separately.

Step 2 — Holding Pressure
Maintain pressure for at least 30 minutes.

Step 3 — Leakage Inspection
Check sealing surfaces, welded joints, and nozzles.

Acceptance Criteria
Hydro test: zero leakage, zero pressure drop
Pneumatic test: soap solution micro-leak detection

4. Engineering Advantages

✔ Easy disassembly during testing

✔ Rapid sealing replacement

✔ Local repair instead of full replacement

✔ Reduced downtime and maintenance cost

5. Tershion Engineering Support

Tershion provides full lifecycle engineering support including pressure testing solutions, ASME / GB-T compliance guidance, installation supervision, and commissioning assistance.

Need a Reliable Pressure Testing Solution?

Contact Tershion engineering team for customized welded plate heat exchanger solutions and technical support.

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