PWHT on khomeyn spherical tank

PWHT on spherical tank in Khommeyn-IRAN – Sep 2019 Heat treatment on spherical tank in Khomeyn, Markazi Iran that accomplished by Hamedsoft engineering company in 18 Sep 2019. Tank detailed as below: Dia : ~21000 mm Maximum Thickness: 48mm Average heating rate: 71’C/Hh Holding temperature: 599 ~ 642 ‘C Average cooling rate: 68’C/hr