2.1　Terms

2.1.1　PP petrochemical plant

The petrochemical plant refers to the plants in the refineries，petrochemical complex，petrochemical fiber plants or their complex where petroleum，natural gas，coal and their products are used as feedstock to produce and store various petrochemical products.

2.1.2　PDP process design package

As a technical carrier，process design package is developed to find solutions to technical sources and technical reliability，and it is shortened as PDP.

2.1.3　BED basic engineering design

Basic engineering design（BED）is intended to find solutions to technical schemes and engineerization.

2.1.4　DED detailed engineering design

Detailed engineering design（DED）is intended to find solutions to project construction and execution，develop construction drawings and propose the requirements in aspects of installation，inspection and acceptance based on the determined technical schemes and principles.