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More information on the quantification metric used in these Performance Requirements is in our new quantified Performance Requirements article.

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(1) Compliance with C1P3 for pipe sizing is verified for each sanitary plumbing pipework section when the discharge flowrate is not less than the greater of

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Quantifying these requirements (or ‘quantification’) provides a measurable level (like numbers and percentages) you need to meet. We call this a metric. The benefit of this, is that you have a clear bench mark to work to. This provides a clear performance level and helps reduce misinterpretation.

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It also considers a frequency factor. The frequency factor takes into account the likelihood of simultaneous usage, based on building classification and fixture type.

Clause (b) of C1V1(1) also sets a minimum limit, which is the highest volume of fixture discharge. This ensures that the pipe is appropriately sized for the expected discharge volume.

Another way we’re applying quantification in the NCC is by including new Verification Methods. Verification Methods are tests or calculations which prescribe a way to directly comply with the Performance Requirement.

One of the key quantified Performance Requirements for pipe sizing is water service velocity. This is covered in these Performance Requirements in Section B of Volume Three:

We’ve ‘quantified’ many of the Performance Requirements and developed new Verification Methods that you can use when developing Performance Solutions.

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Using C1V1 as an example, it provides an approach to comply with the requirements for pipe sizing of sanitary plumbing systems using a quantified metric.

This allows for different approaches for pipe sizing of water services, whilst still meeting a minimum performance level, all thanks to a quantified metric!

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They provide practitioners with a maximum velocity for the pipe system, as well as outlining exceedance criteria.  For instance B1P2 states:

No, for example Section C contains other changes to the Performance Requirements for sanitary plumbing and drainage, like pressure and system ventilation (C1P5). This is quantified, as follows:

This quantification example provides the appropriate limits within the sanitary plumbing system, before the risk of sewer gasses escaping, by limiting the pressures within the system to not exceed a ±375 Pa air pressure limit. To use this approach to demonstrate compliance with these Performance Requirements detailed technical modelling and analysis is needed.

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Some Performance Requirements are qualitative – meaning they are subjective and not easily assessed. This can make it difficult to determine if the requirement is met and can discourage practitioners from using a Performance Solution.

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These Performance requirements are quantified using the same methodology, with slightly different metrics, depending on the situation.

C1V1 includes the calculation for the probable simultaneous wastewater flowrate (flowrate), or the likely flowrate for pipework considering the expected use of the fixtures upstream of the section of the pipe in use.