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Pressure Series 2

Pressure Testing Series 2

Destructive Exposure of CorrView to 13,000 PSI Conditions and Final Failure


In its new and original form, the CorrView corrosion monitor is nothing more than a standard 1-1/2 in. threaded pipe plug.  Its interior compartment is hollow but sealed from the piping line pressure by its front wearable surface.  Once this front surface fails due to corrosion, its interior compartment, normally at low atmospheric pressure, then increases to the line pressure of the piping system.  For fire protection systems this is typically no more than 150 PSI; for HVAC systems at high rise office buildings, higher pressures of 400 PSI are possible.  Questions therefore exist to establish the safe and reliable working pressure for the device.

In our design engineering of CorrView, we selected the highest quality, highest pressure capacity sight glass available for this critical application.  As detailed in our explanation of its construction, the body of CorrView is CNC computer controlled machined from one solid piece of bar stock steel having no welds or seams.  The quartz sight glass is fused to the steel in its molten state - thereby producing an hermetic glass to metal seal capable of withstanding high pressures. 

Under low corrosion conditions, CorrView  may remain unchanged and in its original form for decades to show the lack of a corrosion problem.  Once its front metal surface wears at any point, however, its internal pressure will increase to the line pressure of the piping system and thereby exert that same force against the front sight glass, as well as against the internal threaded joint and O-ring which seals the sight glass assembly to the main body.   

CorrView provides a dual sealing system between its main steel body and sight glass assembly - through the use of permanent 60,000 PSI anaerobic threadlocker, and through its secondary O-ring seal at its mating metal to metal surfaces.

The sight glass itself has a manufacturer's stated maximum operating pressure rating of 3,000 PSI, and a burst pressure of 7,000 PSI - well exceeding the 375 PSI maximum pressures found at very few cooling water or fire sprinkler applications, and then only at the tallest commercial properties. 

Until corrosion wears the front surface to the point of failure, CorrView acts simply as any other threaded pipe plug and will easily handle any high pressure conditions within typical commercial, government, and residential properties.  Prior to sufficient corrosion activity to wear through its front water contacting surface, the internal pressure against the sight glass is at zero.

Our own pressure testing at the factory established CorrView capable of handling pressures to 1,000 PSI, yet interest was raised in certifying it to a higher operating limit.  To provide a rating of our device to sustain high pressure internal conditions, an independent outside laboratory was commissioned to perform a high pressure evaluation on CorrView .

                             

Independent Testing Procedure

A Canadian client considering to install the CorrView corrosion monitor at a process water piping system required a destructive certification of the device to determine its maximum operating pressure limit.  In response, two standard CorrView corrosion monitors were shipped to Maxbar, Inc., Houston, TX for high pressure destructive testing.   

Both units were drilled through its front wear surface to simulate that corrosion had penetrated the surface, and the units threaded into a high pressure forged threaded fitting.  The units then were physically contained in a high pressure chamber where pressure was raised until failure occurred.  Pressure to the threaded fitting was transferred to the interior of the CorrView monitor as would normally occur during actual field operation.

                              

Laboratory Photos

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Pressure Testing Results

CorrView monitor # 1 failed at its front quartz sight glass at a final pressure of 13,030 PSI.

CorrView monitor # 2 failed at its front quartz sight glass at a final pressure of 11,540 PSI.

                                

Laboratory Certification

The below independent certification of pressure holding capacity for the CorrView corrosion monitor well exceeds any operating parameters for any building services piping.  It exceeds by approximately 10 times the 1,300 - 1,500 PSI test pressure applied for listing of fire sprinkler service equipment for use in piping systems typically having a maximum operating limit of typically under 150 PSI.

 

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The CorrView corrosion monitor as been designed and constructed with safety and reliability as its first criteria, and well exceeds the pressure and strength demands of any cooling water or fire sprinkler application.  It is manufactured and assembled in the USA using only the highest quality American made components. 

Lower pressure testing has also been performed, with further documentation provided in our Pressure Testing Series 1.

 

©  Copyright CorrView International, LLC

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CorrView International, LLC

P.O. Box 8513
Landing, NJ  07850
www.corrview.com
Ph:    973-770-7764
Fax:  973-770-6576

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