MNB-50 Directional Drilling Machine

Download the booklet MNB-50 (PDF 25,5 MB)

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Small-sized unit, with the pulling capacity of 50 tons, for construction of average-diameter pipelines in urban environment


  • Directional boring with dry method at the distance of up to 120 meters
  • Replacement of old pipelines up to 200 meters long



Installation and operation options for the MNB-50 unit:

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  • from the pit (3 m long, 1 m wide)
  • from OR-1,5 formwork manufactured by MEMPEX (2,5 m long, 2 m wide)
  • from the existing manhole (Ø 1500 mm)

No bentonite mixtures required.
Soil types: all types except rocky soils.


General specifications:

Monitoring device:

Radar RD – 385 L

Operating temperature range:

-20° ... +40°С

Pulling capacity for directional boring:

37 tons

Pulling capacity for pipe pulling into position:

50 tons

Hydraulic cylinders:

1 pc.

Rated operating pressure of hydraulic cylinders:

20 MPa

Total weight of the basic equipment (drilling rods not included):

1100 kg

Hydraulic unit:


Honda GX 690 (gasoline)


17,7 кW

Overall dimensions:

Hydraulic unit:
  Length    1500 mm
  Width        630 mm
  Height       780 mm

  Length     2750 mm
  Width        920 mm
  Height     1200 mm

Drilling rod:
  Length     1020 mm
  Diameter     48 mm
  Weight        14 kg



Key parameters:

Drilling  parameters:
- Directional boring length: 120 m*.
- Diameters of pipes to be laid: from 63 mm to 315 mm.
- Personnel required for works: 3 persons.

Worn pipeline replacement parameters (pipe bursting):
- New pipeline diameter**: from 90 mm to 315 mm.
- Minimal old pipeline diameter:  100 mm.
- Replaced pipeline length:  200 m.
- Personnel required for works: 3 persons.

* - drilling parameters can vary and can be higher or less: they depend on geology, working team skills, soil moisture content etc.
** - with the same diameter or with higher or smaller diameter.

Pipeline types:
- Water and sewerage
- Gas
- Conduits for cables used for various purposes

Replaced pipeline material:
- Cast iron
- Reinforced concrete
- Ceramics
- Asbestos
- Steel

New pipeline material:
- Polyethylene
- Steel


Distinctive features:

  • versatility;
  • easy operation;
  • reliability;
  • small overall sizes;
  • low cost.

The MNB-50 unit’s principal competitive advantage is its wide range of functions.

Minimal excavations for pits, with the surrounding areas remaining maximally untouched, make the MNB-50 unit especially appropriate for confined urban conditions.

MNB-50 works reliably under severe winter conditions in Russia, Belarus, Ukraine and Kazakhstan.

MNB-50 is the most popular unit in the relevant class, due to its good combination of price, versatility, scope of application and small sizes.

MEMPEX JSC offers new applications for MNB-50:

Since November 2009, the MNB-50 equipment kit is provided with the new hydraulic unit; not only the machine’s hydraulic power cylinder can be connected to it, but also various hydraulic equipment (such as a jackhammer, a pump, a circular saw, a chain saw, a jig saw, a drill and even a nut runner or a valve rotation device).