Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

01 chapter01 process_flow_diagram

Chapter 01 - Instrumentation Control Systems Documentation by Frederick A. and Clifford A. Meier. An ISA Publication.

  • Login to see the comments

01 chapter01 process_flow_diagram

  1. 1. Process Flow Diagrams (PFD’s) Chapter 01 – The Process Flow Diagram EMEC125
  2. 2. What is a PFD and Who Uses Them? • What is a PFD? • Process Flow Diagrams (PFD’s) are drawings that show a representation of only the absolute required elements of the entire process. They are a schematic representation for converting raw materials into a finished product. The details of this conversion are not shown on PFD’s. • Who uses them? • Strategic planners • Managers at the corporate level • Designers • Sometimes, regulatory agencies
  3. 3. Minimum Amount of Detail on a PFD • Process critical details are schematically shown in the least amount of space • PFD’s are the “Big Picture” • Line sizing is rarely, if ever shown • Only show equipment that: • Impacts material balance • Has a large impact on utilities • Contains an ownership transfer point • Process equipment that is needed for further definition of the process • Special equipment
  4. 4. Additional Detail on a PFD • Details may be added at the customer request if implementation is complex and/or costly to the project • Major measurement points, some control valves and control methods and possibly process analyzers can be shown. These types of items will then be duplicated on the P&ID • When the PFD is reviewed, there should be: • Enough information to help with the development of all the P&ID’s • Long lead items should be spelled out
  5. 5. PFD Example – Basic Cement Plant PFD_Cement_Plant.pdf
  6. 6. Process Description for Cement Plant • Lime stone is mined at the local quarry and crushed with a bell crusher and hammer mill. • The crushed lime stone is conveyed to a stone storage/blending building where a bridge crane blends it with Gypsum, Silica, Sand and Clay depending on the grade of cement being produced. • The blend of materials are then conveyed to a ball mill where it is pulverized. • The pulverized material is then dried and blown into a rotary kiln that burns the material at 1,450°C/2,642°F. • The result of burning the material creates clinker with is place into a storage silo. • The clinker is than placed in a finishing ball mill to produce the powder. • The cement is conveyed to a finished goods silo where it can be packed in bags or bulk loaded into tank trucks.
  7. 7. Classroom Exercise • Pick a process that you are familiar with and hand draw/sketch the process. • We will then discuss some of them as a group.

×