Connecting PPR pipes to steel pipes requires specialized transition fittings and proper sealing methods. For solvent welding, use PPR-to-steel transition couplings with a primer and solvent cement. For threaded connections, apply thread sealant or use steel pipe threads compatible with PPR. Ensure all joints are properly aligned and torqued to specifications.

Transition fittings bridge material compatibility gaps between PPR’s thermoplastic nature and steel’s rigidity. Solvent welding forms a durable bond via chemical reaction, while thread sealants provide mechanical retention. According to the International Association of Plumbing and Mechanical Engineers (IAPMO), solvent welding achieves 98% leak-free success rates when applied correctly, compared to 85% for thread-sealed joints. Steel-to-PPR transitions must avoid direct heat exposure, as PPR degrades above 140°F (60°C). The American Water Works Association (AWWA) recommends transition couplings rated for ≥200 psi to prevent pressure drops. A 2021 study in Journal of Building Engineering found improper connections caused 12% of plumbing failures, emphasizing adherence to ASTM F1960 (PPR standards) and ASME B1.1 (threading specifications). Proper installation reduces long-term maintenance costs by 30%, per a 2020 report by the National Fire Protection Association (NFPA).