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  • expert support

Press Fit Primary Pipework

Overview of Press Fit Primary Pipework

The primary pipework is the pipe connected from the heat source or cylinder to the heating manifold or directly to an emitter. Pipe sizing in a heating system heavily dictates the achievable flow rate. Installation of the incorrect pipe size will cause performance problems with a heating system. Assessing the flow requirements of the hot and cold feeds to taps and showers are equally important prior to installation.

Over recent years, heating engineers have been turning away from traditional copper pipework and have been installing plastic or multilayer pipe. A normal multilayer pipe consists of three to five layers. Connections within a heating system have also advanced, compression fittings, press fit connections and push fit connections are commonplace in a modern heating system.
Some plastic pipe installations suffer from pipe creep, this is due to pipes expanding and contracting. Multilayer pipes have less expansion and are therefore much quieter in situ.

The Basics of Primary Pipework in your Heating System

Primary pipework is often referred to as the ‘pathway’ between the heat source (boiler, heat pump, cylinder or thermal store) and the heat emitters (radiators, heat pumps, trench heating etc). Once a thermostat calls for heat, the wiring centre will switch the boiler demand terminal and active the system pumps. Once the valves are open warm or hot water circulates from the heat source to the heat emitter traveling through the primary pipework system. Sometimes the system is designed to split a house or commercial building; a primary circuit (A) maybe for the ground floor heating systems and a primary circuit (B) maybe for the first-floor heating. Typically this method is used to split a pump load (to ensure flow rates) or to simplify future maintenance.

System Design & Expert Support

Using the heat emitter design (radiators or Under Floor Heating for example) we calculate the pipe sizing required to achieve the correct flow rates. Different pipe types have a different internal bore and therefore we need to select the pipework accordingly. We also assess the total number of connections within a system as this can also affect the flow rates.
On completion of the individual sections (heat source, primary pipework, and heat emitter), we then review the system as a whole. Finally, a further checking process confirms correct operation and compliance with current building regulations, guides, and standards. Considerations are made during the whole house design process relating to specific manufacturers product guidelines. This predominantly relates to minimum flow rates, high limit protection, and additional isolation valves within the primary pipework ‘section’.

Tailored Heat Press Fit Pipework Solutions

Older heating systems will most probably have been designed using a rule of thumb, more modern system, both emitter and heat source, require a finite approach. Our systems consist of components from the industry’s leading manufacturers, the very best design methods and coupled with a high standard of technical back up. This straightforward approach is why we are one of the UK’s market leaders, happily supporting thousands of installations.
We supply a wide range of contract installers, house builders, plumbing and heating engineers and builders merchants. Talk to Tailored Heat about your project today.

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