Your going through a maintenance procedure on a rotary screw compressor. Its summertime and the load is on the plant no time to shut the compressor down.You need to take an oil sample from the compressor..The question is where do you pull the sample from? AND How do you prevent a foam bath of oil?God knows I been in this situation before try to take an oil sample from a service port and have the sample bottle fly out of your hand and get oil all over the floor.Would like to know any tips!