Witherup is highly experienced at building above ground welded storage tanks to API 650, API 620, API 653 (repairs), and AWWA D-100.
Witherup is PA-DEP certified with the ability to meet DEP requirements in all 50 states.
Witherup’s quality control, design, fabrication, and erection are qualified to ASME Section VIII, Division I, and welders are qualified to ASME Section IX.
Witherup holds Certificates of Authorization from the National Board: U, R, S, and NB.
