Archives :: Processing & Handling :: Liquid, Gas and Air Handling :: Piping & tubing

Displaying 121 - 135 of 135 stories.
October 1, 2007
Click here for full pdf version of this article - includes all graphs, charts, tables, and author information   This fourth in a series of articles* on piping for process plants examines two topics that may, at first, seem to fall outside the scope of chemical engineering — piping codes and the pipe fabrication. Obviously chemical engineers will not be welding pipes together, but understanding the...
July 1, 2007
    Piping design is the job of configuring the physical aspects of pipe and components in an effort to conform with piping and instrumentation diagrams (P&IDs), fluid-service requirements, associated material specifications, equipment-data sheets, and current good manufacturing practices (GMP) while meeting owner expectations. All of this must be accomplished within a pre-determined...
March 1, 2007
  Pipe flanges are used to mechanically connect pipe sections to other pipe sections, inline components, and equipment. Flanges also allow pipe to be assembled and disassembled without cutting or welding, which eliminates the need for those two operations when dismantling is required. In providing a breakable joint, however, flanges unfortunately provide a potential leak path for the process fluid...
March 1, 2007
Until now, creating a set of "as-built" plant drawings meant either laser-scanning the outline of an entire piping system, or measuring all the components manually. By paring Leica Geosystem's in-field-to-model laser technology with Coade's CADWorx Plant Design Suite, Coade, Inc. (Houston, Tex.; has reduced the time required by more than 50%, says Vornel Walker, Coade's manager...
February 1, 2007
    This is the first in a series of articles that will cover a wide range of piping topics. The topics will cross process-industry lines, pertaining to, for example, the chemical, petroleum-refining, pulp-and-paper and pharmaceutical and other industries.The main intent of these articles to address questions and misunderstandings as they relate to use of piping on a general basis.   Typical...
January 1, 2007
Two specimens made from Basell Corp.’s Hostalene GM5010 high-density polyethylene (HDPE) that were installed in October 1956 are still in service, according to Ulrich Schulte, head of the application and technical service for Basell’s Pipe...
December 1, 2006
    Reinforced PVC makes a kink-free hose Kink- and crush-resistant Vardex hose (photo) for both pressure and vacuum applications is now available from this manufacturer. Made of clear PVC with steel wire reinforcement, Vardex is suitable for either fluid or air transfer. Applications include chemical lines, material handling, cleaning equipment, water feeds and discharge, vacuum lines, shop...
October 1, 2006
    Since its introduction to the market in 1959, chlorinated polyvinyl chloride (better known as CPVC) has proven suitable for use in a wide variety of chemical process environments. Because it is inert to most mineral acids, bases, salts and aliphatic hydrocarbons, it offers a more reliable, long-term performance than many other materials, including metals and most non-metallic alternatives. In...
August 1, 2006
Mitsubishi Heavy Industries Co. (MHI; Mihara, Japan; has developed an integrated piping-and-instrument system, called M-iPIS, which makes small, complex piping systems from a single plate block. Analogous to the manufacturing of integrated circuit boards, M-iPIS realizes not only cost and space savings, but also produces a gas-tight system with rapid heating and cooling...
July 1, 2006
Although polymer-based piping systems have been used in the chemical process industries (CPI) for decades, the global market share is only around 10%, says Stephan Schuessler, head of technology and R&D at Georg Fischer DEKA GmbH (GF DEKA; Dautphetal, Germany; The main reason for the low acceptance of polymer versus metallic materials is because polymers are still...
May 1, 2006
    There are several reasons why composite fiberglass-reinforced-plastic (FRP) pipe has been replacing conventional pipe, and why this still relatively new material (see box, p. 46) should be kept in mind whenever piping is being specified for a new or a revamp project. Engineers involved with specifying or using FRP pipe should have a clear understanding of its nature and properties. A good...
March 1, 2006
    Engineers often need to predict the cost of piping and pipefitting associated with a process unit. Even though detailed prices are available, finding and organizing them takes time and costs money. For those needing a quick method of approximation (such as for a pre-design estimate), a short-cut piping cost method is presented in this article. For convenience and compactness, the relevant...
February 1, 2006
    Piping-flexibility and stress analysis are required in the design of most piping systems before the piping is installed in a chemical-process or other plant. It is intended to ensure the safety of the plant and thus protect the interests of the owner and the general public. Owing to the availability of powerful computer software packages, the analysis has become simple and routine. However...
February 1, 2006
    In pneumatic conveying systems that operate under high positive pressure, it is common wisdom that as the downstream end is approached, the diameters of the pipeline segments should be larger. Air (or other conveying gas) is compressible, so if a single-diameter pipeline is instead used, the gas velocity will reach very high values. If the conveyed material is abrasive, the consequence can be...
January 1, 2006
    Leakage costs industry millions of dollars every year. For example, a few small leaks in a facility using air at 100 psig, with an electric consumption cost of about 6¢/kWh, can waste more than $22,000 annually. Delaying the replacement of a leaking $100 steam trap could waste $50 per week; since an average facility typically has hundreds of steam traps throughout its operations, leaking...
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