What comes first commissioning or startup?

Commissioning and Startup is defined as the transitional phase between plant construction completion and commercial operations. It encompasses all activities that bridge these two phases including systems turnover, checkout of systems, commissioning of systems, introduction of feedstock, and performance testing.

What is the difference between commissioning and start up?

Commissioning – entails running and testing all areas of each system to ensure the system performs as anticipated and to correct any remaining problems prior to Plant Operational Start-up. Start-up – the commencement of actual plant operations.

What is the difference between pre commissioning and commissioning?

COMMISSIONING is putting into service. And, pre-commissioning is - making the system and/or equipments ready for putting into service.