Internal corrosion in gas, liquid and multi-phase transmission pipelines is an issue which damages pipelines worldwide, to a great extent. Hydrostatic testing, direct assessment and in-line inspection are a number of, but not all, ways an operator can verify whether the internal corrosion exists in their pipelines. The threat which internal corrosion holds in a pipeline system is expected to remain there until demonstrated by an operator through these methods, making them an essential assessment.
The disadvantage to relying on operators to demonstrate whether this issue is present in their pipelines is down to the current challenges which exist. Operators managing gas pipelines primarily assume that corrosion does not exist in theirs. This can be a result from having recently worked on pipes, consequently assuming no issues were present during work. The great downfall to these assumptions is the fact that this continues to prolong the issues that may be present within pipeline systems around the world. A number of premium companies host hydrostatic testing, which can be a simple method, yet prevent a huge downfall in pipeline systems across the nation.
Hydrostatic testing involves filling a hose assembly with water and taking it to a pre-specified test pressure. The test pressure is always noticeably higher than the operating pressure, to give a factor of safety. Water is commonly used due to it being easily available, cost-effective and harmless to the system being tested. If on certain occasions water isn’t an option, hydraulic fluids and oils may be identified. Whilst under pressure, the hose is monitored and examined to ensure that the pressure is held and its reliability is maintained. This method is most commonly employed to test pipes for a number of issues. The test helps maintain safety standards, which is why it is an important procedure for operators to employ.