Hot-DIP Galvanized Steel Plastic Composite Pipe for Drinking Water Engineering

1) Process: Plastic lined pipe inserts prefabricated plastic pipe into steel pipe, composited by thermal expansion/contraction or mechanical method; plastic coated pipe applies plastic powder on steel inner wall by electrostatic spraying or fluidized bed dipping; 2) Plastic layer thickness: Plastic lined pipe thicker (1.5-3mm), plastic coated pipe thinner (0.5-1.5mm); 3) Adhesion: Plastic coated pipe plastic layer and steel pipe strong adhesion, plastic lined pipe slightly weaker;

1) Structure: Steel-plastic pipe is steel + plastic composite, PPR pipe is pure plastic; 2) Strength: Steel-plastic pipe high strength, good rigidity, can be surface or concealed installation; PPR pipe low strength, good flexibility, needs dense supports, generally concealed; 3) Temperature: Steel-plastic pipe (PP-R lining) 95C, PPR pipe 95C, similar; 4) Price: Steel-plastic pipe 50-100% higher than PPR;

Yes, but needs special process. Steel-plastic pipe welding notes: 1) Remove inner and outer plastic layer in welding area before welding (grinding), avoid plastic burning producing toxic gas; 2) Use TIG or SMAW during welding, control welding temperature, avoid large area plastic layer melting; 3) Clean welding area after welding, inner plastic layer repair with plastic welding rod or heat shrink sleeve, outer plastic layer repair with epoxy resin or polyethylene;

1) PE (polyethylene): Resistant to general acid/alkali/salt, temperature -20C to 95C, lowest price, for general water supply/drainage and weak corrosive media; 2) PP-R (random copolymer polypropylene): Temperature 95C (short term 120C), resistant to general acid/alkali, good hygiene, for hot water supply and food/pharmaceutical; 3) PVC (polyvinyl chloride): Good acid/alkali resistance, but low temperature (<=60C), hygiene concerns, generally for drainage and chemical;

Stock from 1 pipe 3-7 days, common sizes (DN15-DN200) same-day pickup; special sizes and lining materials custom rolling from 5 tonnes 15-30 days. Cutting, threading, grooving, welding flanges etc. fabrication services available.