Sunday, June 16, 2024

Precision Redefined

Die Draw incorporate LiDAR survey data into PE 100 load calculations

By incorporating LiDAR Survey data into our PE 100 load calculations, Die Draw LTD can now produce the most advanced and accurate analysis ever seen in the industry.

We have been developing advanced calculation methods for accurately determining the insertion loads on PE 100 liner pipes for pipeline rehabilitation, and as a result we have seen a step change in the level of accuracy.

LiDAR survey data

- Advertisement -

By incorporating LiDAR survey data into our design process, we can now precisely predict installation loads, ensuring optimal equipment specification and temporary works design. This innovative approach represents a new standard in liner installation design, offering unmatched predictability, control, and safety for thermoplastic lining solutions.

Since the 1980s, the use of thermoplastic liners has been a popular option for the in-situ rehabilitation of deteriorating pipelines. There are several techniques available but for pipelines where maintaining flow capacity is critical then a tight fit lining solution such as Die Draw can be used to retain or even increase flow capacity.

A Die Draw liner is pulled into the host pipe and understanding the loads involved is essential to ensuring a successful installation. Calculating the load for a straight pipeline is relatively simple, however accurately predicting load distribution around bends has always been a challenge. The viscoelastic nature of PE 100 alters material properties with “time under load” and ambient temperature.

Bending moments

The bending moment changes as the liner negotiates a bend, depending on factors like bend radius, liner insertion diameter, and host pipe’s internal diameter.

Current industry practice of increasing friction factor to account for bends often leads to inaccurate force predictions and poses challenges in equipment specification and temporary works design.

PE 100 liners from Die Draw can negotiate bends of up to 22.5° and have even been successfully installed in 45° bends. However, each bend affects the overall installation force, and the number of bends a liner can negotiate depends on their orientation, radius, and location within the pipe section. Each pipeline section is unique and will result in different loadings, which is further complicated by the change in stiffness and strength of the liner at different ambient installation temperatures.

Developing and refining

For the last five years Die Draw has been developing and refining our own calculation methods. Die Draw is now able to accurately predict the loads around bends as part of our design process, determining the optimum liner insertion size to negotiate the bends in the host.

A recent refinement of our process has been to incorporate LiDAR survey information into our design. Using this data rich technology enables very accurate prediction of installation loads accounting for every minor deflection within the host pipe and all variations in internal diameter. This enables us to precisely predict installation loads enabling optimum equipment specification and temporary works design.

The implications are that the Die Draw design process can be used for successful installation of all thermoplastic liners including those by Die Draw and slip-lining too.

We believe our design process for installing liners is the most sophisticated method yet developed, and we are not aware that anyone else in the industry has achieved this.

- Advertisement -
Trenchless Works bringing you balanced journalism, accuracy, news and features for all involved in the business of trenchless and no-dig from around the world

Related Articles

- Advertisement -
- Advertisement -
- Advertisement -