Thanks for your feed back. Yes, maybe by mistake technically we are using the term "Cladding" while it should be "Lining". By cladding I mean metallurgically bonding a noble metal to the internal surface of a CS pipe, however, the above mentioned terms are used interchangeably...(REF: Materials selection for corrosion control (ASM), Chapter 27,By S. L. Chawla and R. K. Gupta.