Boiler pipes, flanges & connections

Boiler pipes, flanges and connections form the hydraulic and structural joints between a boiler's heat exchanger, pump set, expansion vessel and distribution manifold. They carry hot water or steam under pressure, seal combustion-side and water-side circuits, and allow controlled access for service and commissioning. Flanged spigots, swept elbows, reducing nipples and threaded union pieces all belong to this family.

Choosing the correct fitting depends on nominal bore, thread type and pitch (BSP or metric), pressure rating, operating temperature, end connection standard and, where applicable, the angle or offset of the run. A flange must match both bolt-circle diameter and face type. Where you hold an order number from the original equipment or from another supplier, use it to cross-reference directly to the equivalent part in this section.