An "Ad-Hoc" test is required in a situation where there is no recognized test procedure, but testing must be done to prove that a product is suitable. One good example is testing covers to protect the main well-head valves for North Sea oil rigs. The valves operate quite slowly, and in the event of a fire would have to continue to work in extreme temperatures for some 15 minutes. An Ad-Hoc pool-fire test was designed to develop temperatures in excess of 1000^OC within three minutes of the fire starting!
  
These types of test require much experience of testing, and a great deal of cooperation from the laboratories!

                                                              A small pool-fire