a sample draining apparatus includes a hydraulic circuit having a sampler vessel and a drain vessel disposed therein . a first pump is located outside the hydraulic circuit and pumps fluid from a fluid source outside the hydraulic circuit into the hydraulic circuit to pressurize the circuit . a second pump is disposed in the hydraulic circuit for circulating fluid in the hydraulic circuit so that a fluid sample flows from the sampler vessel into the drain vessel while the sample is maintained within the closed hydraulic circuit .