REHABILITATION

IS A SPECIAL DESIGNED THERMOPLASTIC COVERED HOSE DEVELOPED FOR REHABILITATION OF DRINKING WATER MAINS, SUCH AS MUNICIPAL PIPE LINES WHERE HEAVY TRAFFIC IS LIMITING REHABILITATION WORK, BUT ALSO LONG SECTION RURAL PIPE LINES AS RIVER CROSSING ETC.

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GERMAN KTW (DVGW) 

Class A certification for permanent

drinking water contact

MANDALS rehabILITATION

is a special designed thermoplastic covered hose developed for rehabilitation of potable water mains, ranging from 4” (DN100) to 12” (DN300) nominal pipe diameter. 

The hose is packed and delivered in a “U-shape”, using tape wrapped around it. Prior to installation a regular cleaning procedure is required of the host pipe and condition controlled by CCTV etc. afterwards. 

 

The hose is pulled through the host pipe by using a wire winch e.g., and can be installed in water mains having bends up to at least 30° (R/D ≥5). No steaming is required to inflate the hose afterwards. Just by recoupling and setting the hose under minimum 1 bar pressure, it opens up and expands towards the inner pipe wall. 

 

Mandals Tube In (Drinking Water) is a semi-structural, stand-alone hose that will ensure continual water supply even if the host pipe should break. It consists of a thermoplastic polyether based polyurethane (TPU) with excellent wear & tear properties, outstanding hydrolysis resistance and resistance against microbiological attack. Operational pH range is 4-9.

The “extrusion through the weave” production method gives excellent bonding between cover and lining as well as firmly encapsulating the circular woven polyester reinforcement

 

Service Life Time will depend on proper and correct installation into host pipe, as well as concentration of disinfectant chemicals added to the potable water. This should be kept at a minimum. Accelerated aging tests performed by the TPU supplier indicates more than 20 years until 50% Tensile strength reduction at a chlorine dosage in the range 0,05 to 2,5 ppm.   (Arrhenius diagram). Please note that this should be regarded as indicative data only. 

TECHNICAL DATA 

DOWNLOAD DATA SHEET (PDF)

NOTES:

(1)    Will depend on Operating Pressure and Hose Diameter  

(2)    Depending on Operating Temperature. Contact Fenner Mandals for further advice     

(3)    A Safety Factor of 2,5 is applied

(4)    Theoretical calculated Tensile Strength. Efficiency factor of 0,8 is applied

(5)    In-house Test procedure ( Double strokes –ds)

(6)    Test procedure: NS-EN ISO 8033 (increased requirements)

SECTION LENGTHS WILL DEPEND ON:

- Hose Dim:  Large dim = > Shorter lengths. Secondly, higher friction and drum space

- Number of bends:  More bend => Higher friction => Higher traction   

- Bend angle and R/D ratio:  Sharp bends  => Higher friction and greater risk of damage to the hose during retraction. 

Can be dampened with good lubrication (silicone oil / cooking oil etc.) on hose. High R7D ratio mean less curvature and facilitate retraction, but also less"buckling" or folding of the hose at the smallest curvature radius. 

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REHABILITATION

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IS A PERFECT DESIGNED THERMOPLASTIC COVERED HOSE DEVELOPED FOR REHABILITATION OF INDUSTRIAL WATER MAINS AS FOR INSTANCE COOLING WATER, FIRE WATER MAINS, ETC.

MANDALS rehabILITATION

The Hose can be delivered in diameter range suitable for 4” (DN100) to 12” (DN300) nominal pipe diameter. The hose is packed and delivered in a “U-shape”, using tape wrapped around it. Prior to installation a regular cleaning procedure is required of the host pipe and condition controlled by CCTV etc. afterwards. 

 

The hose is pulled through the host pipe by using a wire winch e.g., and can be installed in water mains having bends up to at least 30° (R/D ≥5). No steaming is required to inflate the hose afterwards. Just by recoupling and setting the hose under minimum 1 bar pressure, it opens up and expands towards the inner pipe wall. 

 

Mandals Tube In (Drinking Water) is a semi-structural, stand-alone hose that will ensure continual water supply even if the host pipe should break. It consists of a thermoplastic polyether based polyurethane (TPU) with excellent wear & tear properties, outstanding hydrolysis resistance and resistance against microbiological attack. Operational pH range is 4-9.

The “extrusion through the weave” production method gives excellent bonding between cover and lining as well as firmly encapsulating the circular woven polyester reinforcement

 

Service Life Time will depend on proper and correct installation into host pipe, as well as concentration of disinfectant chemicals added to the potable water. This should be kept at a minimum. Accelerated aging tests performed by the TPU supplier indicates more than 20 years until 50% Tensile strength reduction at a chlorine dosage in the range 0,05 to 2,5 ppm.   (Arrhenius diagram). Please note that this should be regarded as indicative data only. 

TECHNICAL DATA 

DOWNLOAD DATA SHEET (PDF)

NOTES:

(1)    Will depend on Operating Pressure and Hose Diameter  

(2)    Depending on Operating Temperature. Contact Fenner Mandals for further advice     

(3)    A Safety Factor of 2,5 is applied

(4)    Theoretical calculated Tensile Strength. Efficiency factor of 0,8 is applied

(5)    In-house Test procedure ( Double strokes –ds)

(6)    Test procedure: NS-EN ISO 8033 (increased requirements)

SECTION LENGTHS WILL DEPEND ON:

- Hose Dim:  Large dim = > Shorter lengths. Secondly, higher friction and drum space

- Number of bends:  More bend => Higher friction => Higher traction   

- Bend angle and R/D ratio:  Sharp bends  => Higher friction and greater risk of damage to the hose during retraction.

Can be dampened with good lubrication (silicone oil / cooking oil etc.) on hose. High R7D ratio mean less curvature and facilitate retraction, but also less"buckling" or folding of the hose at the smallest curvature radius. 

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