Title:	3D computer model improves HAZOP reviews
Company:	Raytheon Engineers & Constructors, Houston, Texas
Case History Source:	http://www.intergraph.com/pbs/library/Raytheon.pdf
Case History Author(s):	Not given, Intergraph presumed.
Application:	Use of a 3D model created with PDS for an electronic HAZOP and maintainability review.
As-Is Process:	Manual What-if and hazard and operability (HAZOP) analysis. Using P&Ids and plot plans, team members identify possible accidents and associated event sequences. Team members review study nodes for access, operability, and hazards. They identify operator actions. The team uses P&IDs, plot plans, process controls or logic, 3D plastic models, and orthographic drawings.
To-Be Process:	Raytheon Engineers performs electronic HAZOP reviews with clients such as Citgo Refining and Chemicals Inc. The combination of full-scale PDS models and DesignReview dynamic walkthrough software allows Raytheon and Citgo to make measurements and assess clearances and maintainability of the plant design during design and HAZOP reviews.
To-Be Technology:	Intergraph's Plant Design System and DesignReview software.
How-To Process:	Raytheon used Intergraph PDS to design three Citgo oxygenated gasoline blendstocks battery limit units. In addition to PDS, Raytheon also took advantage of Intergraph's DesignReview dynamic visualization software to review the design with Citgo project managers and operations engineers throughout the project. Raytheon and Citgo jointly decided to use the 3D model created with PDS for an electronic HAZOP and maintainability review. Engineers used DesignReview to walk through the model during the meeting. This was the first time either company had used 3D computer graphics to perform a HAZOP review. For the review, a computer workstation was connected to an overhead projection system in Citgo's training center at its refinery in Corpus Christi, Texas. The projection system displayed the 3D models on a 6-by-6-foot screen so that the 30 people at the meeting could clearly see all the plant components. Personnel from operations, safety, construction, and reliability assessment, and other members of the project team from Citgo participated in the review. Raytheon sent design, process, and instrument engineers to the review.
ROI:	Raytheon Engineers & Constructors (Houston) and client Citgo completed the post-P&ID hazard and operability (HAZOP) and maintainability review in one-fourth of the usual time - with the participation of more team members.
Other Benefits:	Review of the project designs in greater detail. Thorough review of every instrument, pipeline, platform, and valve. Pre-consctruction procedural planing by the operations and maintenance staff. Improved design through better understanding of the details. Reviewreviewers no longer needed piping orthographic and isometric drawings Error rate of less than one-half of one percent, based on the total value of the mechanical contract vs. total amount of money spent to correct errors. Prediction of construction progress typically within one percent or better of actual progress.
Rating:	Editor's Choice
Comments:	An unusually well documented, forward looking use of 3D plant models.
Company Contact:	Not Given, quotations from .Bill Young, Director of Engineering, Raytheon and Wilson Holes, Manager of CAD operations, Raytheon (281-529-7105, wilsonh@hia.net).
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