Short Answer: High pressure horizontal autoclaves are front loading pressure vessels that are capable of functioning above the normal pressure range in terms of sterilization. High pressure horizontal autoclaves are utilized when temperature/pressure of the process is above the normal temperature/pressure level of 121°C and 15 psi in laboratory autoclaves. First Understanding the Ter... https://www.bionicsscientific.com/autoclave-sterilizer/horizontal-type-autoclave-steam-sterilizer.php