Abstract: A piston type hydro pneumatic accumulator with internal leak detection, having a gas chamber and a liquid chamber, the piston type hydro pneumatic accumulator comprising a cylindrical barrel, a floating piston, a gas end cover, a liquid end cover, a leakage detection construction having a first cylindrical channel reducing to a conical channel and further reducing to a second cylindrical channel, a floater device, the gas end cover and the liquid end cover hermetically disposed into the cylindrical barrel, a first pressure meter disposed so as to measure a pressure in the first cylindrical channel and a second pressure meter disposed so as to measure the pressure in the second cylindrical channel, the readings in the two pressure meters used for inferring a gas leakage or a liquid leakage.