The　hydrogen　stove　pipe　is　a　crucial　component　of　the　petrochemical　industry,　operating　at　high　temperatures　for　extended　periods.　Creep　cracks,　particularly　axial　cracks　in　the　inner　and　outer　walls,　are　a　common　form　of　damage　in　these　pipes.　In　this　study,　the　ultrasonic　transmission　method　was　utilized　to　detect　creep　cracks　in　the　inner　wall,　while　the　vertical　mutual　induction　eddy　current　method　was　utilized　to　detect　creep　cracks　in　the　outer　wall.　To　accommodate　actual　testing　conditions,　the　specialized　fixtures　of　the　transducers,　a　mechanical　structure　for　crawling　on　the　outer　wall,　a　rotating　sweeping　mechanism　and　the　multichannel　testing　mechanism　were　designed.　Additionally,　an　ultrasonic　eddy　current　control　circuit　and　upper　computer　control　system　were　developed　which　can　successfully　detecting　defects　in　the　inner　and　outer　walls　of　the　pipe　with　exceptional　sensitivity　and　precision.　These　results　have　significant　implications　for　improving　the　safety　and　reliability　of　petrochemical　operations.　©　2024,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Switzerland　AG.