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Feb . 10, 2026 16:32
Reliable Hydrostatic Pressure Testing for Welded Steel Pipes
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.




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.
• 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
📝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 |
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

It is installed after pipe cutting and finishing, and before final inspection, marking, and packing.
Typical hydro tester machines can generate test pressure up to 100 MPa, depending on pipe size and testing standards.
Yes. Hydrostatic testing is often required by API, ASTM, EN and other international standards for pressure-bearing pipes.
Yes. Pipe diameter, length, test pressure, sealing type and control system can be customized to match production requirements.
đź’¬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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