We choose the piercing machine depending on the diameter of the borehole to be performed and/or the types and diameters of the pipes we are installing. The numerical value in the name of the machine is also its diameter, so the MAX K130S has a diameter of 130 mm. And such a diameter of the hole can be made with this machine, without using additional accessories.
There are dedicated groups of accessories for each machine, increasing its functionality. By going to the subsequent tabs of the sub-page PIERCING MACHINES, you can see what installations can be made and what accessories can be equipped with a given machine. Here we also encourage you to read the material in the section HOW THE MOLE WORKS and HOW TO MAKE A PIERCING.
The piercing machine can be equipped with, among other things, an expander, otherwise known as a calibrator. It allows you to make a piercing machine with a diameter much larger than the diameter of the machine itself. The table below illustrates what borehole diameters can be obtained with particular moles. It should be assumed and remembered that the final diameter of the borehole, after the passage of the mole, will slightly decrease, due to the expansion of the soil, compacted by the passage of the mole, and depends on the type of soil and the degree of compaction.
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machine/ diameter |
MAKING BOREHOLES (mm) |
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Ø55 |
Ø65 |
Ø75 |
Ø95 |
Ø135 |
Ø130 |
Ø160 |
Ø180 |
Ø195 |
Ø219 |
Ø244 |
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K55S |
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K65KS |
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K65S |
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K75KS |
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K75S |
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K95S |
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K130S |
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K160S |
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K180S |
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mole |
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mole + expander |
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When choosing the most suitable machine, you need to assess what diameters you will make most often. If, for example, the most common diameter will be in the vicinity of 130 mm, and occasionally larger diameters, the most economically reasonable choice will be the MAX K130S with a suitable expander. You must remember that making a widened hole, involves double the work. That is, it is first necessary to do the piercing with the mole itself, and then let the machine armed with the expander run along the same track. This lengthens the time it takes you to do the work, but reduces the costs you would have to incur if you decided to buy a larger mole.
If, on the other hand, in the future, there will be more and more work making larger diameter boreholes, the purchase of a larger machine becomes economically justified. The larger machine will allow faster performing (in a single operation) of larger diameter boreholes, of which you will have more and more. In contrast, the smaller K130S, purchased earlier, will only be used for smaller piercing operations.
The situation is similar when choosing a machine for direct pulling of PE/PVC pipes. The table below shows typical PE/PVC pipe diameters and machines dedicated to a given diameter.
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machine/ diameter |
PULLING PIPES PE/PVC (mm) |
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Ø50 |
Ø63 |
Ø75 |
Ø90 |
Ø110 |
Ø125 |
Ø140 |
Ø160 |
Ø180 |
Ø200 |
Ø225 |
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K55S |
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K65KS |
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K65S |
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K75KS |
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K75S |
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K95S |
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K130S |
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K160S |
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K180S |
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mole + accessories for pulling pipes |
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mole + accessories for pulling pipes or/and expander |
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In RED are marked pipe diameters that can be installed using only a suitable pull-in sleeve installed in place of a standard screw.
The GRAY color indicates pipe diameters for which we will need not only the pull-in sleeve itself or a special towing screw, installed in place of a standard screw, but also a suitable expander.
PE/PVC pipes with diameters from 25 to 55 mm can be pulled in manually, having first performed a piercing. For pulling in such diameters, there is a tool for manual pulling of pipes.
Moles are universal piercing devices. This means that it is possible to install PE/PVC pipes and to ram steel pipes with them. The following table shows the capabilities of each machine for ramming steel pipes.
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machine/ diameter |
RAMMING STEEL PIPES (mm) |
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Ø133 |
Ø159 |
Ø219 |
Ø273 |
Ø323 |
Ø355 |
Ø406 |
Ø457 |
Ø508 |
Ø610 |
Ø711 |
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K55S |
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K65KS |
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K65S |
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K75KS |
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K75S |
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K95S |
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K130S |
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K160S |
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K180S |
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T240 |
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mole + dedicated cone (set of cones) |
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As you can see, the larger the machine, the greater the capabilities. However, it should be remembered that larger machines mean greater difficulty in maneuvering a heavier machine during the work. To make piercing easier, use a machine that is sized for the size of the specific installation. It is also worth considering the type of soil and the length of the pipe to be rammed. In one case, the K130S will perfectly cope with ramming a pipe with a diameter of 323 mm and a length of 20 meters. And in another place, when we are dealing with extremely difficult ground conditions, only a machine of a larger caliber will allow the efficient completion of a similar task. A smaller machine will also cope with this installation, but the ramming process will take a little longer. Remember, however, that in carrying out any piercing work, the most important thing is the accuracy of the machine itself (in the case of PE/PVC pulling or self-piercing) and proper preparation related to aiming and giving direction to the machine and/or the steel pipe being rammed.
The table below compiles the technical data of the moles and rammer from our offer:
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PARAMETER |
UM |
MAX K55S |
MAX K65KS |
MAX K65S |
MAX K75KS |
MAX K75S |
MAX K95S |
MAX K130S |
MAX K160S |
MAX K180S |
MAX T240 |
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diameter |
mm |
55 |
65 |
65 |
75 |
75 |
95 |
130 |
160 |
180 |
240 |
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length |
mm |
1180 |
937 |
1366 |
1146 |
1501 |
1641 |
1815 |
2110 |
2256 |
1639 |
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weight |
kg |
15 |
15 |
22,5 |
24,5 |
33 |
56 |
115 |
203 |
275 |
378 |
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air consumtion* |
m3/min |
0,7 (1,1) |
0,8 (1,2) |
0,8 (1,2) |
1,0 (1,2) |
1,1 (1,8) |
1,7 (2,5) |
2,4 (3,6) |
3,5 (4,5) |
4,5 (5,0) |
6,0-7,5 |
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air pressure |
atm |
7 |
7 |
7 |
7 |
7 |
7 |
7 |
7 |
7 |
6 |
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impact energy |
J |
40 |
70 |
100 |
80 |
150 |
250 |
430 |
710 |
1140 |
2000 |
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impact frequency |
Hz |
8 |
11,5 |
6 |
7,6 |
6 |
7 |
6 |
6 |
5 |
1,7-2,5 |
*the recommended value in brackets ensures optimal working parameters
The growing popularity of trenchless techniques and the stricter criteria for selecting this method as the most suitable in an increasing number of cases means that the demand for trenchless installation projects is growing rapidly. This, in turn, means that the piercing machine is becoming an indispensable, even standard tool for more and more installers and construction companies, just like an impact drill or angle grinder. We observe that more and more companies are choosing to have more impact moles of different sizes in order to more effectively and efficiently complete specific orders. We suppose, therefore, that it is reasonable economically and profitable to invest in a fleet of piercing machines as the number and size of installations carried out grows.
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Feel free to contact us directly for more information. We will help you choose the most suitable machine for your needs.