HAMAR LASER STEALTH Series, General Training Manual

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Air Turbulence and Outdoor Use - Fixed Centerline Alignment
When aligning the centerline of rotary equipment, such as large steam turbines or paper mills, the effects
of air turbulence and gradient may be several times worse than those quoted for the machine shop. Since
these alignments are often performed outside or in semi-protected work areas, the laser beam may be
enclosed in 6 in. plastic sewer pipe. This will reduce atmospheric effects; however, a vertical gradient
immediately sets itself up inside the pipe and blowers must be used to break up this gradient. These
blowers are usually mounted in elbows or T’s that can be obtained from Hamar Laser. We recommend
that you contact Hamar Laser for detailed instructions when working in a situation like this.