Standard Diameter Range for PPR Systems
PPR pipe fittings typically range from 20mm to 160mm in diameter. Common residential sizes include 20mm, 25mm, and 32mm for water supply lines. Larger industrial systems use 63mm to 160mm fittings. European DIN standards specify exact outer diameters for each nominal size. For example, 20mm nominal equals 20.4mm actual outer diameter.
Wall Thickness Specifications
Wall thickness varies by pressure rating (PN). PN10 fittings have thinner walls than PN20. A 25mm PN10 fitting has 2.3mm walls, while PN20 version has 3.5mm. Manufacturers provide detailed dimension tables matching pipes to fittings. Proper wall thickness ensures pressure containment and joint integrity.
Socket Dimensions for Proper Jointing
Fusion welding requires precise socket depths. A 20mm fitting has 14mm socket depth, while 63mm needs 22mm. German DIN 16962 standardizes these measurements. Insufficient insertion causes weak joints. Over-insertion creates flow restrictions. Special tools ensure correct depth during installation.
Threaded Connection Sizes
Some PPR fittings combine plastic with metal threads. Common metric threads include Rp½” (15mm) and Rp¾” (20mm). These hybrid fittings connect PPR systems to existing metal pipes. Thread accuracy follows ISO 7-1 standards. Always use thread sealant compatible with plastic.
Reducing Fittings and Transition Sizes
Reducers adapt between different PPR sizes. A 32×25mm reducer transitions main lines to branches. Concentric reducers maintain centerlines, while eccentric types prevent air pockets. Transition fittings also connect PPR to other materials like copper or PVC with millimeter precision.
Special Fitting Dimensions
PPR pipe fittings include elbows, tees, and crosses with unique dimensions. A 90° elbow in 25mm has 38mm center-to-end measurement. Equal tees maintain branch diameters identical to run sizes. Manufacturers provide CAD drawings with all critical dimensions for planning.
Metric vs Imperial Size Comparisons
Though specified in millimeters, some markets reference imperial equivalents. 20mm equals roughly ¾”, while 32mm approximates 1¼”. However, exact millimeter sizes ensure proper fusion welding. Never mix metric PPR with actual imperial-sized pipes without proper adapters.
International Size Variations
While ISO standards dominate, regional differences exist. Chinese GB/T standards slightly differ from European DIN sizes. Middle Eastern projects often specify DIN dimensions. Always verify sizing standards before international projects. Reputable manufacturers label products with applicable standards.
