and Inc., and turning Apple into the world’s most valuable business. And it’s continued to be a key differentiator under Chief Executive Officer Tim Cook, helping ward off rivals such as Samsung Electronics Co. The elegance of Apple’s products - including the once-revolutionary idea of a phone that was just a screen - helped fuel the company’s comeback under Jobs. Evans plans to stay on as we work through the transition, and we’d like to thank her for her leadership and contributions.” “The senior design team has strong leaders with decades of experience. “Apple’s design team brings together expert creatives from around the world and across many disciplines to imagine products that are undeniably Apple,” a spokesman said in a statement. If no such valve is specified, the design pressure of the piping is equal or less than the maximum pressure of the equipment.Buy 2-year plan with SD20 code for special priceĪpple confirmed Friday that Hankey is stepping down. If the piping is connected to a piece of equipment with a lower design pressure than the design pressure of the piping, a pressure relief valve should be installed to protect the equipment.Using the line list is helpful for whoever is making the labels to ensure every line is marked to the organizations labeling requirements. The line list can also be used to ensure line labeling at the end of a project.Additionally, it can be used to verify that the piping spools are all delivered on site, when they are needed. The line list can also be used for material expediting and tracking.A legend or key ensures the engineering and design company is using the right designation for their project. It is a good practice to include a key or legend to the line identifier or line designation.Updating the line list to include the isometric ensures that all isometrics are created and can help during the QA/ QC process.Piping isometrics are the last drawings created before the project is issued for construction. Like the equipment index the line list is an evergreen document that cannot be finalized until the overall design is complete.Special Information & requirements such as post weld heat treatment, pickling, hydrotest requirements, etc.Special calculation requirements such as pipe stress.Design and operating pressure and temperature of the service.Piping specification and/ or piping code.Fluid phase - liquid, vapor, two phase, etc.Service or commodity - materials that are flowing through the piping.Start and ending point of the line - includes equipment connections or connections to other lines. ![]() The author of this article cannot stress enough the use of the word unique. Line identifier ( line designation, line number) - a unique number that identifies the line in the plant or process unit.Mechanical Designers - Used to ensure that the lines on the P&ID are accurately reflected in the piping design.Īt a minimum, the information on a line schedule is as follows: Mechanical Engineers - Contains line numbers, connections, isometric numbers, and other items that are related to the overall construction of the piping. Process Engineers - Specifies the process requirements such as the design and operating pressures & temperatures, flowing medium, piping code, Line ID, reference P&ID numbers etc. If the maximum pressure is 200psi but the piping code is an ANSI 600 system, it should be documented on the line list. At it’s core, it should help provide justification on why certain decisions were made in the design process. A line list (or line schedule) is a database created to communicate between the process and mechanical engineering teams when designing piping in a plant or process unit.
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