Waterhammer Solutions - Background
When water flow is started or stopped faster than the system can respond acoustically, a pressure surge commonly referred to as a waterhammer event will occur. This same principle is also applicable when the flowing medium is steam rather than water. In the case of steam, the pressure surge is known as a steam hammer event. Both water and steam hammer events have the potential to cause catastrophic damage.
Waterhammer events are transmitted through the system at the speed of sound of the water-pipe combination. For water in a steel pipe, this is essentially the speed of sound in water (~4600 ft/s or 1400 m/s which is close to 1 mile/s). With this high transmission velocity, pipe segments are loaded in a highly transient manner causing them to shake. As a consequence, significant dynamic loads can be transmitted to the piping supports as well as the system components, i.e. valves, instrumentation, etc.
A structured approach to addressing waterhammer solutions provides an efficient and cost effective and safe solution to address your waterhammer issues.
Our expert team of engineers has extensive experience addressing and resolving various types of waterhammer issues utilizing the following:
Our experimental facilities are designed to conduct noncondensable gas-water or steam-water waterhammer tests simulating conditions of interest in plants including those situations where a noncondensable gas volume is formed in the pump discharge piping. Waterhammer pressures are measured during the experiments and translated to plant conditions. This data can be used to set the limits of acceptable gas accumulation. Tests are conducted in an extended length piping configuration of the plant system and most importantly, the tests are run for a range of initial void sizes in the piping high point.
Our experts have experience testing multiple components at our facilities including: