Latest posts
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Purging, packing and blanketing: three different nitrogen jobs
Purging, packing and blanketing use the same gas for different purposes. What each achieves, how success is measured, and where operators conflate them.
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Nitrogen inventory, and doing the gas law properly
How much nitrogen a job actually needs. Using PV = ZnRT with the right compressibility, and why ideal-gas estimates run short at pressure.
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Dew point criteria and the soak test rebound
Drying is accepted on outlet dew point plus a soak test. Why rebounds happen, what a diminishing rebound proves, and what final acceptance requires.
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Minimum purge velocity and the onset of stratification
Purging depends on velocity, not just volume. Below a threshold velocity the gases stratify by density and the purge stops sweeping.
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Four methods of pipeline drying compared
Hot air, dry air, vacuum and nitrogen drying each suit different lines. How they compare on time, cost, achievable dew point and practical constraints.