Dry & Preaction Systems
Corrosion in fire sprinkler systems is widespread, costly and disruptive.
Now thanks to Holtec’s pioneering work, the cost and operational downtime associated with replacing corroded sprinkler piping can be avoided. With ongoing innovations in this field, we are at the frontlines of the rapidly growing application of using nitrogen gas in dry and pre-action sprinkler systems – virtually eliminating corrosion in new piping systems and allowing the use of less costly materials during construction. Generated nitrogen gas is the effective and environmentally friendly way of treating this costly problem, and available leasing allows for rapid implementation of the technology.
History: Holtec's involvement since 2006
Holtec supplied the first nitrogen generator in the US for protecting 13 pre-action systems in a data center in NC. In 2006. 99% nitrogen (with 1% oxygen) was the basis in that system. The following year dry and pre-action sprinkler systems in two more data center were provided similar protection. All of the above referenced systems have and operated without corrosion problems since that time.
From 2008 until 2013 dry 98% nitrogen (with 2% oxygen) was used as the medium for corrosion protection. This was applied in conjunction with a procedure of first pressurizing the sprinkler piping with air to meet the required 30 minute fill time. The air was then purged out and replaced by nitrogen over a set period of time by vent assemblies (multiple types offered with varying degrees of automation), one installed on each zone.
In mid-2013, Holtec made the decision to return to the use of nitrogen with 99% oxygen to further enhance the protection afforded at minimal additional cost.
Our most recent innovation has been to recognize that by producing 99.5% nitrogen (with only 0.5% residual oxygen), the need for venting of the initial air fill is made redundant when compared to competitors generators that produce nitrogen with 2% oxygen (4 times higher). Eliminating the justification for using vents saves a great deal up-front capital cost and eliminates potential long-term maintenance cost and other potential issues. For a copy of the paper that details the basis of this innovation, please contact Holtec.
The Problem: Leaks resulting from Corrosion
The oxygen content of moist compressed air is by far the main cause of internal corrosion in steel and galvanized steel forming gas pressurized sprinkler piping. Microbial Induced Corrosion (MIC) is relatively of minor importance.
The Solution: Holtec’s Nitrogen Inerting Technology
Install Holtec nitrogen generator(s) to pressurize the dry or pre-action sprinkler piping with 99.5% nitrogen.
Information needed for a quotation from Holtec:
In order to be able to quickly evaluate the application of nitrogen for gas pressurized sprinkler systems Holtec needs the following initial information. All of this is on our inquiry form but here is a little more explanation why the information is required:
Always exercise caution using these systems in occupied areas as nitrogen in the absence of oxygen does not support life. We have created a simple computer calculation method to determine if an occupied space is sufficiently large to be safely protected by a sprinkler system pressurized with nitrogen gas, taking into account the volume in the sprinkler piping, the operating pressure and the elevation at the location. Holtec is making this available to all. Please contact us for your copy of this important tool.
Holtec Gas Systems