Hydro Tester Machine: A Key Inspection Step in ERW Tube Mills

Feb . 10, 2026 16:32

Reliable Hydrostatic Pressure Testing for Welded Steel Pipes

What Is a Hydro Tester Machine?

A Hydro Tester Machine, also known as a Hydrostatic Pressure Testing Machine, is used to test the pressure resistance and leak-tightness of welded steel pipes by filling the pipe with water and applying internal pressure.

In an ERW tube mill line, the hydro tester is a critical quality inspection machine. It ensures that each finished pipe meets international standards before delivery, helping manufacturers avoid leakage risks in real applications.

Position in ERW Tube Mill Line

In a typical ERW pipe production line, the hydro tester is installed after pipe cutting and end finishing, and before inspection, marking, or bundling.

🚀Typical process position:
Forming & Welding → Sizing → Cutting → Hydro Testing → Inspection → Marking & Packing

This position allows pressure testing to be carried out on individual finished pipes, ensuring accurate and reliable test results.

Main Functions

• Detect weld seam leakage and micro cracks
• Verify pipe strength under internal pressure
• Ensure compliance with API, ASTM, EN and other standards
• Improve overall pipe quality and customer confidence

Typical Technical Parameters (Reference)

📝Parameters can be customized according to pipe size and standard requirements.

Item	Range
Pipe Outer Diameter	21 mm – 630 mm
Pipe Length	3 – 12 m
Test Pressure	Up to 100 MPa
Pressure Holding Time	5 – 60 seconds (adjustable)
Test Medium	Clean water
Control Mode	PLC automatic control
Sealing Type	Axial or radial sealing

Why Hydro Testing Is Essential for ERW Pipes

ERW pipes are widely used in oil & gas, water supply, construction, and structural applications, where internal pressure safety is critical.
Hydrostatic testing is often a mandatory inspection step, required by end users and international standards.

A reliable hydro tester machine helps pipe manufacturers:

• Reduce rejection rates
• Avoid after-sales quality disputes
• Enhance brand credibility in global markets

FAQ – Hydro Tester Machine

1. Where is the hydro tester installed in an ERW tube mill❓

It is installed after pipe cutting and finishing, and before final inspection, marking, and packing.

2. What pressure range can a hydro tester machine provide❓

Typical hydro tester machines can generate test pressure up to 100 MPa, depending on pipe size and testing standards.

3. Is hydrostatic testing mandatory for ERW pipes❓

Yes. Hydrostatic testing is often required by API, ASTM, EN and other international standards for pressure-bearing pipes.

4. Can the hydro tester machine be customized❓

Yes. Pipe diameter, length, test pressure, sealing type and control system can be customized to match production requirements.

💬Need technical details or a customized solution?
Contact our engineers to discuss your pipe size, pressure requirements, and testing standards.

👉 Talk to our technical team

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