Corrosion in sprinkler system piping can be a costly problem if leaks occur, causing damage to the interior of a structure, according to Matt Klaus, Principal Fire Protection Engineer with the National Fire Protection Association.
Replacing piping is no small expense, either. Corrosion can also cause blockages in the piping network, which can lead to an ineffective sprinkler system during a fire.
Corrosion can take on many forms, including oxidation, microbiologically influenced corrosion, and galvanic corrosion. The technical committees responsible for NFPA 13, Installation of Sprinkler Systems, have been looking at ways to eliminate or reduce corrosion in sprinkler systems for several revision cycles.
Reducing corrosion in dry systems can be achieved by eliminating all of the water from these systems after testing/activation and using alternative gases like nitrogen for charging these systems. For wet systems, limiting the amount of air in the system is the goal. Air trapped in pressurized sprinkler system piping results in an increase in the concentration of dissolved oxygen in the piping, enabling corrosion. Venting the trapped air in a wet system reduces this problem, so a revision to the wet system sprinkler system standard requires that a single air vent be installed for each system.
Depending upon the building geometry and sprinkler design, it is possible to trap air in many locations in the system, meaning a single vent may not be effective. Therefore, some stakeholders believe that the requirement adds cost to the property owner and the design team without any assurance that there is a long-term benefit to the system.
Related Stories
| Apr 26, 2012
Lack of bolts on steel support caused collapse at Cincinnati casino
Too few bolts connecting horizontal steel support beams with vertical steel columns was the cause of January’s construction accident at Horseshoe Casino Cincinnati, according to the report of the Occupational Safety and Health Administration.
| Apr 26, 2012
OSHA criticized for taking too long to roll out safety rules
The Occupational Safety and Health Administration takes far too long to adopt new safety regulations compared to other agencies’ development of rules, safety experts said during a Senate hearing.
| Apr 26, 2012
Contractors fear that GSA scandal will lead to fewer federal construction contracts
In the wake of the recent scandal at the General Services Administration in which workers spent lavishly at a Las Vegas conference, a spokesman for Associated General Contractors of America said contractors are worried the scandal will result in cuts to GSA's construction and renovation budgets.
| Apr 26, 2012
Developers can use LEED wastewater credits to help gain approvals in environmentally sensitive locales
Those wanting to pursue development in heavily regulated and environmentally sensitive areas are benefiting by designing projects that qualify for LEED points, even if the project as a whole does not achieve certification.
| Apr 26, 2012
New York City Council moves to license elevator mechanics
New York’s City Council introduced a measure last week that would require the city’s 7,000 elevator mechanics to meet national standards and be licensed by the city.
| Apr 23, 2012
AAMA releases updated specification for anodized aluminum
AAMA 611-12 describes test procedures and requirements for high performance (Class I) and commercial (Class II) architectural quality aluminum oxide coatings applied to aluminum extrusions and panels for architectural products.
| Apr 19, 2012
Michigan legislature tackling controversial rules on electricians
A fight is brewing in the Michigan legislature over how many fully qualified electricians must be present during electrical work when apprentices also are on hand.
| Apr 19, 2012
Washington city may base building code on rising sea level due to global warming
Aberdeen may become the first city in Washington to base a building code on rising oceans and global warming.
