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Blast-One Weekly Tips
Tip #107
Eliminate all 'whip' hoses in use today!

If you are wondering if we have lost our mind---read on!

3/4" (19mm) and 1" (25mm) I.D. 'Whip' hoses are most often the cause of the largest pressure drops in the ENTIRE blast cleaning system.

Whip hoses are very often used to give the operator a light weight and flexible hose next to the blast nozzle for his comfort and to make it easier for him to bend the hose to get into normally inaccessible areas. But the pressure loss created by choking down the flow of compressed air and abrasive with the smaller size hose will reduce the blast nozzle pressure by as much as 10 PSI when using a 10' (3m) length of 3/4" (19mm) or 7 PSI when using a 1" (25mm) I.D. whip 10' (3m) long.

These losses are based on the use of a 3/8" (9.5mm) orifice blast nozzle. We do not question the need for a flexible, light weight piece of blast hose next to the blast nozzle, and in the past, a smaller I.D. "whip" hose was the only choice. But, TODAY there is a better way!

Blasting

Instead of reducing the I.D. of the hose near the blast nozzle, use the new 1 1/4" I.D. "SUPA FLEX" hose right up to the blast nozzle holder. This eliminates the reduction in size of the blast hose, will give even more flexibility than the present "whip" hoses, but will hold the pressure drop to the absolute minimum!

For every pound of pressure loss you have between the air compressor and blast nozzle, the efficiency of the entire blast cleaning operation is reduced by 1 1/2%. If you eliminate a 10 PSI loss by using 1 1/4" (32mm) I.D. SUPA FLEX hose instead of a 3/4" (19mm) regular whip, there is the 15% we promised you. Even if you are using a 1" I.D. whip hose, we will reduce the pressure drop by about 7 PSI, which is a 10% efficiency increase by using SUPA FLEX hose. The calculations are based on your using a 3/8" (9.5mm) long venturi style blast nozzle and 10' (3m) of 3/4" (19mm) or 1" I.D. whip hose. If you are using longer whips, 16' (5m), 25' (7.5m) or even 50' (15m) whip hoses, your savings will be even greater. Foot for foot, the 2-PLY SUPA hose is just slightly heavier than 3/4" (19mm) I.D. regular blast hoses, but is about 30% lighter than either type of 1" (25mm) I.D. This ought to keep the blast operator happy.

When you start to plan the blast hose type, length and I.D. size, you should use the same principles of distribution used by water and gas companies when they plan lines into a new sub-division. They will start out with perhaps a 16" (40cm) line, run it for a couple of miles, reduce it down to 12" (30cm) for a couple of miles, then down to 8" (20cm) or 10" (25cm) to keep the volume and pressure high even to the last lot. We need to use the same ideas in planning the blast hose sizes. If you will be working within a 50' (15m) to 100' (30m) radius of the blast machine, and will use a 3/8" (19mm) long venturi blast nozzle, 1 1/4" (32mm) I.D. blast hose should be used, with NO whip. If you will be working beyond 100' (30m) and for some reason can not locate your air compressor and/or blast machine closer to the work area, use 1 1/2" (38mm) I.D. as your "feeder" hose to within 50' (15m) of the work area and then reduce to 1 1/4" (32mm) I.D. SUPA FLEX hose to the blast nozzle. This planned blast hose SYSTEM will give you the least possible pressure drops. All the above is based on your work area being no higher than 25' (7.5m) above ground, which we will cover in a later tip.

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