Pretreatment of tested surface
a) Remove oil content, moisture and alkaline materials, if necessary.
b) Especially if alkaline materials are adhered, flush tested surface with copious quantities of water and clean it with air or dust cloth.
Then dry it.
Ammonia gas fill up
a) Input ammonia gas into airtight tank or piping to make ammonia gas
concentration 0.01~1% in terms of weight ratio.
Explosion range of ammonia gas combined with air is 15~28%, showing its concentration is safe.
b) High pressure inside tank makes detection sensitivity good.
But influence of pressure is not that remarkable. Therefore, inspection should be done at the pressure (several mmHg~several tens of mmHg) slightly higher than atmospheric pressure.
c) Time of gas fill up and hold back should be over five minutes.
Application of detection agent
a) As powders of CLC-30 are dispersed in volatile solvent, shake its container till stirring bead is shake well with clatter.
Then spray it evenly in the air before use.
b) Spray it evenly and thinly to the surface of detected object. Thin film shortens detection time.
a) Leakage points are changed from yellow to blue normally within 5∼10 minutes.
b) Large leakage points shows large indication shape.
c) Re-inspection for about 30~60 minutes is required for sufficient detection of fine leakage points.
Detection agent film after inspection is easily removed by dust cloth or wire brush.
a) Mechanical removal by dust cloth or brush
b) Flushing by pressure water