Compact Equipment

SEP 2018

Compact Equipment is a magazine dedicated to equipment owners and operators of small, nimble, tool-carrying construction, landscape and ag equipment — such as skid steers, mini excavators, compact tractors, generators compressors and beyond.

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Pavement Breakers Pavement breakers are great for doing just that — break- ing pavement. Typically, pavement breakers are available in light, medium and heavy models, ranging from 37 to 62 cfm. Light pavement breakers (37 to 49 cfm) are ideal for breaking light concrete, concrete bridge decks and general demolition work. Medium pavement breakers (48 cfm) are designed for concrete road breaking and other general de- motion work. Heavy pavement breakers (62 cfm) are ideal for more rigorous demolition jobs such as breaking rough reinforced concrete. Chipping Hammers Chipping hammers are a top choice for construction and light demolition work applications, including concrete and masonry removal and horizontal and overhead applica- tions. Chipping hammers typically require 26 to 33 cfm. Rivet Busters Rivet busters are ideal for concrete and metal applica- tions, such as removing rivets, heavy-duty chipping and concrete breaking. Applications may include bridge jobs, steel structure maintenance, railroad car repair, shipyards, petrochemical plants or other demolition work. Rivet bust- ers typically require 44 to 50 cfm. Demolition Tools Demolition tools are available in light and medium mod- els requiring 33.4 and 37 cfm, respectively. Light models are ideal for the excavation of clay and hardpan and light horizontal demolition work, while medium models are suitable for medium demolition applications such as con- crete breaking and repairing bridge decks. Backfill Tampers Backfill tampers give you all the power you need for compacting at a speed which allows comfortable control. Backfill tampers are the ideal tool for compacting backfill around utility poles, foundations and other structures. They quickly and efficiently compact backfill soil excavat- ed to perform service line repair before patching the pave- ment. Backfill tampers require about 32 cfm. Drilling Hammers Drilling hammers produce a pounding force to make them extremely efficient at setting anchors and blasting through masonry such as concrete and bricks. Drilling hammers require around 21 cfm to operate efficiently. Rock Drills Rock drills are utilized for drilling and blowing and are available in several model sizes providing a range of down- force. With a range of cfm requirements — from 53 to 80 cfm for the light models to 123 cfm for the medium models — rock drills can satisfy numerous ap- plications. For drilling depths of up to 6 ft and 1.5-in. diameter, a light drill is necessary, while drilling depths up to 10 ft and 1 3/4-in. diameter require a medium drill. Sizing the Right Compressor As mentioned, cfm is the primary factor to help you determine the number of tools supported by any given diesel portable air compressor. Due to the wide variety of applica- tions, gun sizes, types of drive mechanisms and experi- ences of different nozzlemen, the compressed air require- ments for gunite applications cannot be charted. Air flow requirements must be obtained from the manufacturer of the gunite equipment. Air pressure requirements are gener- ally in the 55- to 85-psig range. To protect the compressor, only about 70 percent of its rated free air capacity should be used in gunite applications. For operation of several tools with one compressor, the following table provides the ratio of cfm times the number of tools: Number of Tools 1 2 3 4 5 6 7 8 Factor 1 1.8 2.7 3.4 4.1 4.8 5.4 6.0 For example, to operate eight heavy pavement breakers, which require 62 cfm for each tool, you would multiply 6.0 x 62 cfm = 372 cfm. Consequently, a 375 portable air com- pressor could handle eight breakers. Compressor cfm 90 110 185 260 375 Air Tool Model Number of Tools/Compressor Pavement Breaker 62 cfm 1 1 3 5 8 Pavement Breaker 48 cfm 1 2 4 6 10 Pavement Breaker 49 cfm 1 2 4 6 11 Pavement Breaker 37 cfm 2 3 6 8 12 Tamper 32 cfm 3 4 7 10 16 Rock Drill 99 cfm - 1 2 2 4 Rock Drill 80 cfm 1 1 2 4 5 Rock Drill 53 cfm 1 2 4 6 9 Chipping Hammer 34 cfm 3 4 7 10 15 Utility Drill 21 cfm 5 6 8 10 14 Navendu Sharma is the senior product manager for Sullair LLC. www.compactequip.com 49

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