We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
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In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
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The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Hydrostatic Testing Process for LSAW Steel Pipe
During hydrostatic testing, an LSAW (Longitudinal Submerged Arc Welding) steel pipe undergoes a series of steps to ensure it can withstand the required internal pressure. The testing process is as follows:
- Sealing and Filling:
First, both ends of the LSAW steel pipe are sealed. Low-pressure water is then injected, filling the pipe while allowing any air to escape through exhaust valves. After the pipe is fully filled at low pressure, a high-pressure water injection device increases the internal pressure until the desired test level is reached.
- Pressure Hold and Inspection:
Once the target pressure is reached, it is held for a specified dwell time. During this time, the pipe is observed for any leaks, deformations, or other defects. If any issues are detected, the pressure is gradually released to ensure safety. After releasing the pressure, the end seals are removed, and low-pressure water is drained. The pipe is then moved to a visual inspection station for further examination of any suspicious areas.
- Recording:
An automatic recording device captures the pressure testing curve throughout the process, documenting the pressure changes as per standards.
Pressure Testing Requirements for LSAW Steel Pipe
- Test Pressure:
The hydrostatic test pressure must be at least 0.8 MPa. If the pipe’s working pressure is below 0.8 MPa, then 0.8 MPa is used as the test pressure. Substituting or reducing the test pressure is not permitted.
- Leakage Inspection:
After filling, all connection points, including those with attachments, should be checked for leaks. Any observed leakage should be corrected before proceeding.
- Testing Lengths:
The maximum test length for each LSAW pipe section is 1,000 meters. Intermediate segments should not exceed 500 meters. For systems with varying material properties, each segment should be tested separately.
- End Securing:
During testing, the pipe ends should be securely fixed to prevent movement. Supports must be stable and should not loosen or detach during the test. Valves cannot be used as sealing plates.
- Pressure Measurement:
A calibrated mechanical pressure gauge with an accuracy of at least 1.5% (with a maximum permissible error not exceeding 1.5% of full scale) should be used. The gauge range should be 1.3 to 1.5 times the test pressure, and the dial diameter must be at least 150 mm for accurate readings.
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