Trenching

High quality Polyethylene Pipes & HDPE Pipes technical guidance

Are there any special trenching requirements advised by our customers for PE pipe?

No special trenching requirements are normally needed for PE compared to other materials and the preparation of trenches should follow national or local practices. Sharp stones should be removed from the base of the trench and where laying the pipe across rock or granular soil of angular consistency, such as gravel or cobbles, the trench should be excavated below the required depth to allow the pipe to be laid on imported compacted backfill. It is advisable that PE pipe be surrounded by good...

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Are there any limitations on the depth at which PE pipe can be laid?

There are normally no depth limitations related to PE pipe material. The depth limitation to which PE pipe can be laid is not governed by the material properties but by the site conditions, soil type, level of water table, etc. This is no different from other pipe materials. The pipe should be designed to resist any additional forces from soil loading associated with deep excavations. Suitable precautions should be taken to prevent collapse of the trench walls for deep excavations and...

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Is trench alignment critical when laying PE pipe?

No. The flexibility of PE allows it to be placed with some variations in alignment to suit local terrain if necessary. The alignment of the trench in the vertical plane is dependant on the application for which the pipe is being used. For example, gas and water PE distribution mains can be laid to follow the contours of the ground beneath which the pipe is being laid. PE gravity sewers, however, should be laid to the specified gradient to ensure their correct hydraulic function. In the...

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Can PE pipe normally be installed by trenchless methods or methods using minimum excavation?

Yes. PE pipe is ideally suited to installation by trenchless or minimum excavation techniques and many of the common methods were initially developed for PE. The techniques used by installers that routinely use PE are: Pipe Bursting or Pipe Splitting This technique involves using a device which passes through the existing pipe and breaks it, forcing the fragments into the surrounding soil. The replacement PE pipe is pulled through behind the pipe bursting device. For the replacement of brittle...

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Members of the Association

BOREALISBOROUGEINEOS O&PIRPCKorea Petrochemical IND. Co., LTDLyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
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