Reader Feedback

Review tank designs first I read PLANT ENGINEERING every month. There is always good information. However, as I read the May 2005 Solutions tip titled "Changing hoses and fittings" I was alarmed. Though your "Safety First..." disclaimer does generically cover most concerns with this idea, it does not cover the mechanical design of the tank to which someone might apply this tip.

07/01/2005


Review tank designs first

I read PLANT ENGINEERING every month. There is always good information. However, as I read the May 2005 Solutions tip titled "Changing hoses and fittings" I was alarmed. Though your "Safety First..." disclaimer does generically cover most concerns with this idea, it does not cover the mechanical design of the tank to which someone might apply this tip.

Tanks are designed with both internal and external forces in mind. So, when considering this tip, make sure your plant engineer has reviewed it in detail. Especially, the tank design for external pressure. When a vacuum pump is connected to a tank as described in the tip, the vacuum pump will create a lower pressure inside the tank than the atmospheric pressure acting on the outside of the tank.

I have witnessed a tank implosion (collapse) due to the principles of this tip. In the case I witnessed, the lower internal tank pressure was caused by a pump removing the liquid from the tank when the tank vent was not opened. As the liquid was removed, no air was allowed to fill the void. This caused a lower tank internal pressure than the outside atmospheric pressure, and the tank imploded.

The cost of replacing a tank will far exceed the time saved by improperly evaluating all potential hazards of any maintenance evolution. Even if the tank fluid is water, I would always recommend the proper Lock Out/Tag Out procedure, instead of this Tip.

Kenneth M. Smith

Plant Mechanical Engineer

Innovia Films, Inc.

Tecumseh, KS





No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
2017 Lubrication Guide; Software tools; Microgrids and energy strategies; Use robots effectively
Prescriptive maintenance; Hannover Messe 2017 recap; Reduce welding errors
Safety standards and electrical test instruments; Product of the Year winners; Easy and safe electrical design
Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Diagnostic functions for system safety; Specifying industrial enclosures; Effective decision support for a crisis
Transformers; Electrical system design; Selecting and sizing transformers; Grounded and ungrounded system design, Paralleling generator systems
Natural gas for tomorrow's fleets; Colleges and universities moving to CHP; Power and steam and frozen foods

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
The maintenance journey has been a long, slow trek for most manufacturers and has gone from preventive maintenance to predictive maintenance.
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me