bgas

Mill scale temp : 580.c Wheel abrator - 220mph Straight bore : 200mph – 450 mm Venture bore : 450mph – 450mm Waterblasting exit point : 25 – 35 m,m Dry abrasive blasting : 100psi Mixing ratio of grit & shot : 70 – 80 shot , 20 – 30 grit Bgas surface profile : 30-75 micron Coarse grade – 0.8 – 2.0 , 20 – 50 microns Ex- coarse

1.5 – 4.5 37 – 115 microns

Blasting pressure efficiency : losing psi x 1.5 = - 100 Internal dia of hose = 3 to 4 time of nozzle dia ¼ inch nozzle =103 cfm ½ inch nozzle = 413 cfm Pickling : 5 – 10% of sulpuric acid 65.c to 70.c ,5 – 25 min 2 % of phosphoric acid 1 or 2 min 80.c Bgas ph value : 4.5 – 70 Test for soluable iron test : 5 – 10% of sulpuric acid , blue spot lime yellow back ground Detect soluble choloride : 2 % silver nitrate , 20 second , photographic , black/ brown Powder paint : 240.c Electro static spray : 240.c Long oil paint – more than 65 % oil

Medium oil paint : 45 – 65 % oil Short oil paint: less than 65 % of oil. Mio mineral compound : 85 % of haematite (fe203 ) Air drying : ambient temp. Force drying : below 65.c Stoving : above 65.c Hegman grind gauge : 3 mm band width , 5 -10 aggregates. Tinsley or pull off gauge or foreman gauge : +- 15 Horseshoe gauge : +-10 Banana gauge : +- 5 Conical mandrel : 3-37 mm 80% of incident light : gloss finish Less than 80% of incident light : matt finish Hyrometer or psychro meter : 4m/sec , as too speed possible , 30-40 sec Holiday voltage setting : less than 300 microns : 9 v 300 – 500 microns : 67.5 or 90 v Galvanizing : 100 micron , 425.c , 450.c melting Hot metal spray : surface working temp to 540.c Wire and pistol system : metal wire purity greater than 95% , 35 mm exit point , 100 – 125 microns, 85 – 95 density of original wire