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At the outset, Niles Steel Tank set a single goal for Niles
Steel Shield™ – it must meet or exceed the resistance
properties of the best glass on the market today. With two
years in development, multiple enamel formulas were produced
and tested. The results speak for themselves.
ISO2744 – This International Standard specifies
a method of test for determining the resistance of flat
surfaces of vitreous and porcelain enamels to boiling water
and/or water vapor. Temperature – 100°C. Chemical
– Distilled water.
ISO2745 – This International Standard specifies
a method of test for determining the resistance of flat
surfaces of vitreous and porcelain enamels to a hot solution
of sodium hydroxide. Temperature – 80°C. Chemical
– 0.1 mo1/1 NaOH.
ISO2743 – This International Standard specifies
a method of test for determining the resistance of flat
surfaces of vitreous and porcelain enamels for containers
and chemical apparatus to boiling hydrochloric acid. Temperature
– 100°C. Chemical – 20% HCI.
Spark Test Procedure –
NST uses the most advanced testing method in the industry
to detect the smallest defect in the glass lining. NST assures
that every reactor will meet the customers’ specifications
for allowable spark within the vessel. If your reactor is
used in low flash point chemical environments, NST recommends
a completely spark free vessel.
In order to assure the glass’s resistance to fracture
and its bond strength to the vessel, an initial spark test
is completed after the first topcoat is applied and is documented
before the vessel is allowed to complete the coating process.
Niles Steel Shield™ is made to withstand an initial
spark test of 20,000 Volts where defects are most likely
to be detected. Documentation and results of the spark test
are provided with each vessel.
Electrostatic Charge Test
– To identify minute cracks in the glass that are not
deep enough for detection by spark testing, NST uses a sprayed
electrically charged powder that gravitates toward the steel,
revealing tiny cracking in the glass lining. This test is
available upon request.
Additional Testing –
After initial vessel fabrication, the steel substrate is
examined for small surface defects. Hydro testing is also
performed to ensure the vessel meets the ASME code. Additional
testing is available upon request including 100% dye penetrant,
radiography and ultrasonic testing.
Mechanical Properties –
As with the attention to detail employed in creating a glass
lining with superior chemical resistance properties, Niles
Steel Shield™ was also developed to resist the damages
associated with physical forces as well. The effects of
Rapid Temperature Fluctuation (thermal shock), Impact (mechanical
shock) and Wear (abrasion), can quickly deteriorate a glass
lining of lesser quality.
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