Marine boilers classed by following classification societies have been manufactured

• Det Norske Veritas (DNV)
• Lloyds Register (LRS)
• Germanischer Lloyd (GL)
• American Bureau of Shipping (ABS)
• Bureau Veritas (BV)
• Korean Register (KR)
• NK Class (NK)

The process of obtaining approval as manufacturer of marine boilers from following classification societies are in progress

• Chinese Classification Society (CCS)