How to plan PE pressure systems

Loads

Loads to which pipe systems are exposed during installation or operations are indispensable variables for the engineer. The reasons for this information need to involve the behavior of plastic, which is directly affected by external and internal parameters such as internal pressures as well as temperature fluctuations of the environmental and the flow medium. These influences have a great deal of significance for the life expectancy of a plastic pipe system. You can download here the chemical resistance list. The necessary information about the expected loads that could affect the pipe system have therefore to be considered even in the planning phase.

For this purpose a selection of recurring considerations regarding material application and processing is gathered into the form of a checklist:

What is to be considered?	Pipework	Equipment
Are the dimensions of the pipes and fittings (connecting dimensions) as well as the material data clear and complete?	x	x
Are the requirements of the fittings appropriately indicated (dimensions, load, chemical resistance)?	x	x
Is the standard length of pipe sufficient or are custom lengths possibly more economical?	x
Given the component dimensions based on the indicated catalogue sizes, is a prefabricated part more appropriate?	x
Does the external and internal pipe diameter conform to the chosen nominal size?	x	x
Is statistic evidence to be provided? Should or must an engineer be brought in?	x	x
Do the flanged connecting dimensions indicated in DIN 2501 or ASTM correspond to the pressure ratings for armatures and components?	x
Are special product requirements demanded by the operator, agency or authorities?	x	x
Are acceptance tests required or must test reports be issued in accordance with EN 10204?	x	x
When are the delivered fittings required on the construction site? Are there adequate storage facilities or are on-demand deliveries to be agreed?	x	x
What are the possibilities for transport to the construction site? Is packaging of products required or possible?	x
During installation work, is there surveillance by a neutral agency?	x	x
Are there certified welders for the welding work and are they available?	x	x
Does the welding and auxiliary equipment meet the requirements of current standards?	x	x
What are the local conditions?		x
If applicable, do the components have to be manufactured on site?	x	x
Are facilities available for a final pressure or leakage test?	x	x
Must these be documented?	x	x
Are suppliers and/or manufacturers aware of the operating conditions?	x	x
Important information includes:
- the medium or nature of the flow substance in order to determine the chemical resistance (if applicable, additional information must be obtained from the pipe manufacturer!)	x	x
- the temperature limits (T_{i min}) and (T_{i max}), the load duration, and the medium that loads the pipe or fitting	x	x
- the environmental temperature (T_{i min}) and (T_{i max})	x	x
- the internal pressure (p_{i min}) and (p_{i max})	x	x
- the negative pressure (p_u)	x	x
- the external pressure (p_a) (e.g. soil loads, etc.)	x	x
- does the data involve conditions of continuous load or intermittent operation?	x	x
- does the system to be installed involve an aboveground or an underground system?	x	x
- could there be long periods of disuse with unfilled pipes?	x
- are pressure surges resulting from pump operation to be expected? Size?	x	x
- are the respective weld parameters known?	x	x
- must special manufacturing guidelines or instructions be followed as well?	x	x

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How to plan PE pressure systems

Loads

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