Schici R.,IN-PIPE TECHNOLOGY
Water and Wastes Digest
Challenge: H2S corrosion In wastewater collection and treatment systems Is costing U.S. communities millions of dollars-perhaps more than the cost to prevent Infrastructure corrosion in the first place. Solution: Investigating a wastewater system's H2S sources and problem areas allows operators to reduce dissolved sulflde levels through biological treatment, thus preventing corrosion. Conclusion: With the proper H2S corrosion controls In place, wastewater infrastructure operates more efficiently and over a longer lifetime, saving owners time and money. Source
Li Y.,Xian Jiaotong University |
Gao Y.,Xian Jiaotong University |
Xiao B.,Tulane University |
Min T.,Xian Jiaotong University |
And 3 more authors.
Journal of Alloys and Compounds
The ground state properties of WC binary compounds (h-WC, c-WC, α-W2C, β-W2C, γ-W2C, ε-W 2C) are studied in this paper by using first-principles calculations. Formation enthalpy and cohesive energy for each phase are calculated. The calculated elastic constants satisfy the BornHuangs stability criterion, indicating all studied compounds are mechanically stable. All WC compounds studied in this paper exhibit larger bulk modulus values than many other binary types of carbide such as Fe3C, Cr7C3, Cr 3C, and TiC. Using a theoretical method based on the works of Šimůnek, the hardness of the crystal is estimated. The electronic structures of these compounds are calculated and discussed. Stoners polarization theory for itinerant magnetism is applied to explain the observed paramagnetic behavior of the compounds. Moreover, the heat capacity is also calculated for each compound based on the knowledge of the elasticity and Debye temperature. © 2010 Elsevier B.V. All rights reserved. Source
Horton A.M.,IN-PIPE TECHNOLOGY
Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference
Zinc metallizing with a high-purity zinc wire has been utilized for external corrosion control of iron pipe for more than 50 years. This paper summarizes publications and experiences of metallized zinc on iron pipe over that time period and discusses advantages and limitations of this method of corrosion protection. Advantages include but are not limited to uniform cathodic protection of the iron pipe surface; thicknesses compatible with critical joint tolerances; no special considerations with respect to field cuts, tapping saddles, or corporation stops; no special handling or installation procedures required; ability to «self-heal» in many environments; minimal surface preparation required; and compatibility with current ductile iron pipe manufacturing processes. Limitations include that it is not recommended as a standalone method of corrosion control in severely corrosive soils or areas of stray electrical currents, it has limited cathodic protection at large areas of unrepaired damage in that it is a sacrificial coating that sacrifices itself to protect the iron substrate, and it is not compatible with some polymeric topcoats. In severely corrosive soils or areas of stray electrical currents, polyethylene encasement conforming to AWWA C105 is used to supplement the metallic zinc coating. Previously unpublished results of corrosion studies, with and without polyethylene encasement, are also presented. © 2014 American Society of Civil Engineers. Source
In-Pipe Technology | Date: 2016-05-31
Air-conditioning apparatus; Bath installations; Cooling installations for water; Extractor hoods for kitchens; Heating apparatus for solid, liquid or gaseous fuels; Lighting apparatus, namely, lighting installations; Pipes for heating boilers; Solar water heaters; Spigots; Watering machines for agricultural purposes. Insulating materials; Junctions, not of metal, for pipes; Soundproofing materials; Synthetic rubber; Vulcanized fiber; Waterproof packings for industry; Flexible plumbing pipes of plastic; Non-metal flexible tubing; Non-metal pipe muffs; Packing material for forming seals.
In-Pipe Technology | Date: 2013-03-25
Branching tubes of metal for pipelines; Elbows of metal for pipes; Manifolds of metal for pipelines; Mechanical fastening elements of metal; Metal junctions for pipes; Metal pipe clips; Metal pipe muffs; Metal pipes and tubes; Metal reinforcement materials for building; Pipework of metal including those from alloy steel and titanium.