Last updateMon, 24 Oct 2016 7pm


Warriors, Welding and Wooing the Workforce

Warriors, Welding and Wooing the Workforce

For the last several years, one of the b...

New Test Standards for Low-E Compliance

New Test Standards for Low-E Compliance

Creating practical, unified standards fo...

Avoid Water Hammer Problems in High-Pressure Hydraulic Systems

Avoid Water Hammer Problems in High-Pressure Hydraulic Systems

Water hammer, high-velocity fluid flow a...

The Weekly Report

New Products

  • ja-news-2
  • ja-news-3

Industry Headlines


Industry Headlines

Train Named Executive President of Emerson Automation Solutions


Emerson recently named new senior leadership appointments to its Office of the Chief Executive who now report directly to chairman and CEO David N. Farr, and help develop and guide the company’s global strategies.

Michael H. Train’s new title is executive president of Emerson Automation Sol...


All-Pro Fasteners Receives Monogram Licensing


All-Pro Threaded Products, an All-Pro Fasteners company, received the official API Q1 registration and on September 23, 2016 become the second of only two within the industry to have obtained both the API 20E & 20F monogram licenses.

The American Petroleum Institute (API) has confirmed that All-Pro...


U.S. Natural Gas Production Gives Back August Gains in September


U.S. natural gas production levels in the lower 48 states declined by nearly 1.2% in September 2016 compared to August 2016 levels, according to analysis from IHS Markit. September’s decline drops year-to-date production levels 1% compared to the same period in 2015.

Overall, lower 48 U.S. dry ga...


Duke Energy Carolinas to Provide More Renewable Energy Projects


Duke Energy Carolinas (DEC) recently issued a request for 750,000 MW hours of energy located in its territory. Results from the request for proposals (RFP) will help DEC meet North Carolina's 2007 Renewable Energy and Energy Efficiency Portfolio Standard (REPS) that mandates the company generate 12....


Mid-Atlantic Manufacturing Activity Expands More Than Expected


Results from the Federal Reserve Bank of Philadelphia’s October Manufacturing Business Outlook Survey suggest that regional manufacturing conditions continued to improve. Indexes for general activity, new orders, and shipments were all positive this month. But firms in the Mid-Atlantic region re...


Fed’s Beige Book Points to Modest Economic Growth


Reports from the twelve Federal Reserve Districts suggest national economic activity continued to expand during the reporting period from late August to early October. Most Districts indicated a modest or moderate pace of expansion ; however, the New York District reported no change in overall activit...


A Guide to Valve Cleaning and Specifications

Most of the time we only require that valves be free of basic dirt and debris before they are put in service. However, occasionally service requirements dictate that all traces of oil, dust and grease be removed. A prime example is valves to be used with oxygen. In that case, even a small speck of oil in a 100% oxygen environment can create a devastating explosion. One tiny metallic sliver could cause a minute spark, which is all that would be required to trigger the destruction.


Other media that require this level of cleanliness include numerous other pure gases, chlorine, paints and some chemicals. What all this means is that a standard, off-the-shelf valve cannot be used in these media unless it has been properly processed before installation. Decades ago, achieving this degree of cleanliness required the use of vapor degreasing machinery filled with a chlorinated solvent such as trichloroethane. These chemicals worked marvelously to clean, but they have been proved to be carcinogens, so their industrial cleaning usage has all but disappeared. In their place, environmentally friendly aqueous-based cleaners, such as Simple Green, have become the norm.

Follow the Specs

Even with the use of the right cleaning agent, however, it takes more than a simple “wash behind the ears” to ensure that a valve is clean enough for intended service. This is where cleaning standards and specifications come in. Fortunately, there are very good specifications to guide valve assemblers and technicians in the cleaning process. In fact, the American Society for Testing and Materials (ASTM) has a committee that works solely on specifications for oxygen service applications: Committee G04. This group produces ASTM G93, “Standard Practice for Material and Equipment Used in Oxygen-Enriched Environments,” which is a very thorough document and an excellent reference for valve cleaning procedures.

The Compressed Gas Association (CGA) publishes another often referenced cleaning standard: document CGA G-4.1, “Cleaning Equipment for Oxygen Service.” Many end-users that don’t have their own specific procedure reference the CGA 4.1 standard. The Manufacturers Standardization Society (MSS) also recently created a valve cleaning standard, MSS SP-138-2009, “Quality Standard for Oxygen Cleaning of Valves & Fittings.” This document is derived from many end-user specifications as well as CGA G-4.1. For chlorine service cleaning, the Chlorine Institute references cleaning procedures in its document: “Piping Systems for Dry Chlorine.”

The common denominator for all the cleaning standards is removal of all traces of oils, grease, dirt and other contaminants. The methods prescribed include scrubbing, ultrasonic cleaning, pressure blasting and sand blasting.

Rust Elimination

One important issue in cleaning is the presence of rust on carbon steel components after cleaning. With any of the prescribed cleaning processes, the protective film or rust preventative on the steel is removed, which exposes the metal to rapid oxidation, a problem that is particularly acute in humid environments. In many cases, a light blush of rust is acceptable, but gross deposits would not be. As a result, cleaning may need to be performed in a non-humid area. Additionally, carbon steel valves and components that have been cleaned require some form of corrosion protection—either desiccant bags inserted in the valve bore or an exterior wrapping with vapor phase inhibitor paper, or both.

After valves have been carefully cleaned and checked for proper cleanliness, they are usually put in protective heavy-gauge plastic bags to ensure they stay clean until installation.

Cleaning of valves is a straight-forward process that requires some diligence and quality control. However, guidance is available from various standards and specifications. Also, since the valves must be disassembled for most cleaning procedures, it’s important that the personnel involved be familiar with proper disassembly and re-assembly of the valves to be cleaned.


Greg Johnson, a contributing editor to Valve Magazine, is president of United Valve (www.unitedvalve.com), which offers factory-authorized valve modifications and repair from its Houston, TX facility. Reach him at This email address is being protected from spambots. You need JavaScript enabled to view it..

  • Latest Post

  • Popular

  • Links

  • Events


Looking for a career in the Valve Industry?

ValveCareers Horiz

To learn more, watch the videos below or visit ValveCareers.com a special initiative of the Valve Manufacturers Association