Correctly design lines for sloped, gravity flow

Article Abstract:

Process engineers at chemical and pharmaceutical plants frequently design lines at these plants to deliberately run only partially full. Since only gravity causes flow in such partially filled pipe, the line must be sloped. Process designers have either of two major concerns to consider with regard to the sloped, horizontal portions of such gravity flow lines. These are to predict how full an existing or pre-sized line will run, and to determine the proper diameter of a new line. A simple, iterative technique is suggested to help process engineers address these two concerns with regard to single-phase liquids.

Product development

---

Consider bottom venting for reactive liquids

Article Abstract:

Runaway chemical reactions can be avoided by using passive bottom-venting systems. These devices are popular because they provide several advantages for systems wherein two-phase, vapor/liquid relief does not occur. Compared with top-venting devices, bottom vending systems may offer safer and less expensive emergency relief when a liquid in a vessel undergoes an exothermic runaway reaction. Bottom-venting emergency relief devices can remove energetic liquids from a process vessel much more rapidly than top- vending ones.

Chemical Process Equipment

---

Give thermoplastic pumps a spin

Article Abstract:

Chemical engineers confronting increasing demands for more plant productivity, fewer equipment downtimes/maintenance and compliance with changing environmental regulations might consider the use of thermoplastic pumps as an alternative to metal ones. The list of available thermoplastic materials and their derivatives is considerably vast. With respect to rigid pump components that come into contact with agressive, corrosive or abrasive chemicals, however, seven thermoplastic materials are available.

Similar abstracts:

• Abstracts: Decision models for single-period products with two ordering opportunities. A study on production lines with discrete batch WIP inventory transfer
• Abstracts: Congress to address reformulated gasoline. Cost management in heat-transfer-fluid systems. How can we improve air pollution control?
• Abstracts: Pressure drop for non-Newtonian slurries: a wider path. Sizing up the storage bin
• Abstracts: Web-style intranet speeds design flow. Lasers speed up board production. Take off, plug in, dial up
• Abstracts: Light washed jeans. Control centre. Designs for lights

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.