Also, unlike dual wet seals, the support system for dual dry seals is neither costly nor complicated. A simple, dependable gas panel is shown in Figure 6. The support system here provide a dependable flow of barrier gas to the double seal shown in Figure 5. There may be many candidates in your facility that you have not considered. The use of dual dry seals in pumps is only in its infancy.
Many possible applications are yet to be tried.
Here are a sampling of applications to awaken you to the possibilities. Nitrogen does not circulate, so there is no cooling of the inner seal. Hot Thermonol C Heat transfer fluids are a safety hazard because of their elevated temperatures. One facility was failing single wet seals in 10-15 days due to a low suction pressure that caused severe cavitation in the pump. Correcting the suction problem would have been a major expense and was not feasible at the time.