Improved elastomer formulations have prolonged the temperature and chemical resistance of rubber joints, while innovations in metallurgy have elevated the corrosion resistance and suppleness of metallic joints. 15. Use two wrenches when tightening bolts. When tightening the back again up rings of rubber flanges, tighten bolts in cross pattern sequence https://ptfeexpansionjoint91357.thenerdsblog.com/45464475/5-essential-elements-for-hvac-expansion-joint