Pressure vessels are commonly used equipment for storing flammable hydrocarbon liquids and gases in the process industry. Impinging jetflames affect the vessels in such way that a catastrophic vessel failure is imminent after a few minutes with a high risk of causing domino effects in the affected facility. By using protection systems the induced heat flux on the vessel can be minimized in order to reduce the probability of escalation and prevent a vessel failure. In Austria a cooling water flow rate of 15 l/(m^2 min) is recommended in the ÖBFV E07 guideline [1]. This paper describes the development of a test bench to determine if the prescribed flow rate is high enough for a sufficient cooling of a vessel impinged by a jetflame. An experimental series has shown that a water deluge systems built to the specification given in [1] cannot provide adequate cooling.