Gas piping systems sized with the TracPipe UK Size and Capacity Calculator must be sized in accordance with an appropriate sizing method, such as the method and example detailed in Appendix A (Informative) of BS 6891: 2015 Specification for the installation and maintenance of low pressure gas installation pipework of up to 35 mm (R1¼) on premises. The piping system designer must assure that the installation pipework is of adequate size to ensure that all appliances connected operate at their required heat input in accordance with the appliance manufacturers’ instructions. The user can research the latest TracPipe® Design and Installation Specification by simply selecting the topic he wishes to view in the document index. He will be automatically forwarded to the selected page. To return to the index select the page number at the bottom. Features Easy to use Calculator Automatically updated Design and Installation Specification when connected to Wi-Fi. Frequently asked questions Contact TracPipe® direct