cast-iron (gilled tube) economizer
gilled tube superheater
gilled superheater tube
recessed tube-tube sheet
Tube-Tube Plate Welding
test tube test tube brush test tube holder test tube rack
connection of tube and tube sheet
double tube double tube-plate heat exchanger
Framed tube supported on frames-core tube
gas tube (=gas-filled tube)
Heat Exchange Tube and Tube Sheet
integrated tube-box shell-and-tube heat exchanger
roentgen tube (X-ray tube)
test tube with side tube
thin wall tube to tube-sheet welding