Hydraulic Surge Vessel (Air Chamber) Sizing Calculator
Estimate total air cushion volume, liquid retention volume, and polytropic gas expansion (PĀ·V^1.2 = C) to suppress pipeline pump trip downsurge.
Pipeline & Pumping Initial State
Surge Vessel Sizing Output
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Frequently Asked Questions
How does an air vessel (surge tank) protect pumping stations from water hammer?
When pumps suddenly trip on power failure, forward fluid inertia pulls a severe negative downsurge. The pressurized gas cushion in the surge vessel immediately expands, injecting water into the pipeline to prevent column separation and cavitation vacuum.
Why is the polytropic exponent n set to 1.2 rather than 1.4 or 1.0?
Rapid compression and expansion cycles in water hammer vessels are neither purely isothermal (n=1.0) nor purely adiabatic (n=1.4) due to heat transfer with water droplets and vessel walls. Empirical transient standards specify n = 1.2.
What is the difference between bladder surge vessels and compressor-fed vessels?
Bladder vessels isolate the compressed nitrogen cushion inside a resilient elastomeric bladder, preventing gas from dissolving into the pumped liquid and eliminating the need for permanent auxiliary air compressors.