Coating Reference Handbook - Hempel
Coating Reference Handbook - Hempel
Coating Reference Handbook - Hempel
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HEMPEL<br />
OPEN NOZZLE ABRASIVE BLASTING R1b<br />
HOSES<br />
Hoses cause pressure loss and thus loss of effect.<br />
Following is good practice:<br />
1/ Use min 5/4" hoses with external couplings, and wire for proper grounding<br />
of the blasting equipment.<br />
2/ The blasting hose gives more pressure loss than the air hose. Therefore<br />
if necessary, always long air hose and short blasting hose, i.e. the blasting<br />
pot should be as close to the work area as possible.<br />
3/ Do not kink the hoses, always lay them out in as straight lines as possible.<br />
Pressure loss in bars pr 10 m smooth air hose at 7 bar. (Indicative)<br />
Nozzle Size: mm 8 9,5 10 11 12<br />
inch 1/3 5/16 3/8 7/16 1/2<br />
Air consumption cbm/min 4.6 6.5 7.2 9.1 10.4<br />
Internal Diameter of air hose<br />
1/2" / 12 mm na na na na na<br />
3/4" / 18 mm 0.6 na na na na<br />
1" / 25 mm 0.12 0.25 0.33 0.55 0.66<br />
5/4" / 32 mm 0.05 0.10 0.13 0.18 0.20<br />
1 1/2" / 38 mm 0.02 0.05 0.06 0.08 0.09<br />
na: means a pressure loss of more than 1 bar pr 10 m length.<br />
Over the blast pot there will usually be a pressure drop of 1/2 - 1 bar.<br />
INSPR1b ed1 VALIDITY SUBJECT TO CONFIRMATION 30/04/97 EMi
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