CNG cylinder hydrostatic testing, a cylinder rotating vise (sometimes called a rotating clamp or roller-vise) is a support/holding device used while inspecting and testing the cylinder. Its functions are pretty practical and safety-critical:
1. Secure holding of the cylinder
It grips and supports the CNG cylinder firmly during testing operations.
Prevents rolling, slipping, or sudden movement when the cylinder is pressurized with water.
2. Smooth rotation for inspection
Allows the cylinder to rotate 360° around its longitudinal axis.
This makes visual inspection easy—especially for checking:
External corrosion
Dents, bulges, cuts, or heat damage
Weld seams and base areas
3. Uniform testing and measurement
During hydro testing, rotation helps ensure even stress distribution and proper alignment.
Important when checking permanent expansion, elastic expansion, or volumetric changes.
4. Operator safety
Keeps the cylinder controlled and stable while under very high pressure.
Reduces the

• High pressure capacity
• Heavy-duty industrial design
• Reliable & accurate testing
• Custom-built solutions available

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