Brewis Title Animation


The Standard Towing Head (also known as an expanding towing head or duct puller)

The Standard Towing Head is a simple device that attaches to the end of a piece of plastic pipe  to allow it to be pulled.

It is designed for use with polyethylene pipe of wall thickness between *SDR11 & SDR17.6.  (Other materials and wall thicknesses can also be accommodated)

It is operated by simply inserting in to the pipe and turning the eyebolt.  The turning action draws a cone into four toothed segments which are forced into the wall of the pipe.  The harder the eye is pulled the harder the pipe is gripped.  The grip is so good that it is possible to stretch the pipe!

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Brewis Engineering Ltd
Unit 4 Handlemaker Road
Marston Trading Estate
Frome, Somerset, UK
BA11 4RW
Tel.  +44 (0)1373 468864
Fax. +44 (0)1373 468865

UK Company No. 04684538

Mudtight GOLD

The Mudtight GOLD™ Towing Head is a device that allows a towing eye to be attached to a length of polyethylene pipe in a similar way to a Standard Towing Head.  However, a Mudtight GOLD™ Towing Head also seals the pipe to stop dirt getting in.  This is particularly important for water pipes, gas pipes and fibre optic ducts. 

The Mudtight GOLD™ Towing Head is ideal for use with trenchless technology techniques such as Directional Drilling, Impact Moling and Pipe Bursting where the pipe may be installed through ground water or drilling mud.  Once the pipe has been pulled through the bore the Mudtight GOLD™ Towing Head is easily removed and the pipe left clean inside.  This saves the time and expense of cleaning out the pipe and possibly also saves having to re-chlorinate water pipes.

The unique feature of this product is it's patented three part reversible cartridge.  This allows one towing head to seal both SDR11 wall thickness pipe and also SDR17.6 wall thickness pipe.  This is accomplished simply by reversing the sealing cartridge (see animation on the main Mudtight Gold Page).  On IPS (iron pipe size) Mudtight GOLD™ a bigger range of wall thicknesses can be sealed by using O rings of larger cross section.

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Directional Drilling Swivels

There is a method for installing pipe known as Horizontal Directional Drilling (HDD).

The first part of the process is to drill a pilot bore using a boring head or rock bit.  This is done by rotating the boring head and pushing it into the ground.  Drill rods are screwed onto the back of the boring head to form a long string of rods.  It is possible to steer the pilot bore under rivers, around hazards etc. by using a radio transmitter to locate it. (See sonde housings).

When the pilot bore is complete the second phase begins which involves make the pilot bore bigger, this is called back reaming.  A reamer is rotated and pulled back through the pilot bore enlarging the hole.  A series of reamers may be used to enlarge the bore gradually.

The final phase is to pull in the pipe.  The drill rods are attached to the back reamer and the pipe has a towing head fitted.  The back reamer is rotated as it is pulled through, however the pipe cannot be rotated.  To stop the pipe rotating a drilling swivel is used. 

Use this link to view an excellent video of the process -

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Sonde Housings

The first stage of the Directional Drilling process is to drill a pilot bore.  The boring head has a radio transmitter (or SONDE) attached to it so it can be located and steered.  The radio transmitter is electronic and needs to be protected in a housing.  The housing must also allow drilling fluid to pass through it and reach the cutting head.

The type of cutting head fitted to the front of the housing depends on the ground conditions that are being drilled.  They may include a boring head with a steering plate, a tri-cone roller bit, jetting assembly or mud motor.

Mud motors are used to drill through rock, this is a long process so a battery powered sonde may not be suitable.  The mud motor is powered by pumping drilling fluid through a long corkscrew type housing which causes the cutting head to rotate.  A good flow of fluid is needed to drive the motor.

Brewis Housings are particularly good for this as they allow very high flows and can accommodate both battery powered and cable powered transmitters.

Find out more about Mud Motors from the links below

Mud Motor Brochure (pdf)

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► Return to Non Mag page