IS 2825 is India's code for unfired pressure vessels — the Indian equivalent of ASME Section VIII. It covers design, fabrication, inspection, and testing of pressure vessels used in chemical, petroleum, pharmaceutical, and process industries. Compliance is mandatory under Indian Boiler Regulations.
Code for design, fabrication, inspection, and testing of unfired pressure vessels (not directly heated) for use in chemical, petroleum, and process industries.
Key Values
ScopePressure >1 kg/cm² or capacity >0.1 m³
Joint efficiency (full RT)1.0
Joint efficiency (spot RT)0.85
Practical Notes
! IS 2825 is old (1969) — many Indian companies now use ASME Section VIII Div 1 or PD 5500 directly.
! All pressure vessels must be registered with the Chief Inspector of Boilers and inspected by authorized inspectors.
! Full RT of all butt welds gives joint efficiency 1.0 — spot RT gives 0.85 (thicker walls needed).
! Post-weld heat treatment (PWHT) is mandatory for carbon steel vessels above certain thicknesses.
! Design conditions must include startup, shutdown, and upset conditions — not just normal operation.