we are going to set up 1 MMTPA Naphtha hydrotreater in our refinery. Naphtha hydrotrater consist of vertical cylindrical Naphtha charge heater. The charge heater has two pass and each pass contain 32 nos of vertical tube. Our charge heater is in construction stage. For checking mechanical integrity of weld joints in tubes we are going to carry out hydrotest of tubes after placing tubes inside firebox. Also charge heater is part of reactor circuit. Any lumps of water will damage hydrotreater catalyst.
1) How should we remove water and debris from tubes after hydrotest as our tubes are vertical?
2) Are there any alternative methods to check weld integrity instead of hydrotest?
I know one option is pigging but we are not going to do it because of cost.