![]() Galvanized steel pipe has all the advantages of steel pipe, plus improved corrosion resistance in most environments, although at a slightly higher cost. It provides a sacrificial anode (zinc) to receive corrosion instead of the steel corroding.It coats the surface like paint, and under most circumstances it forms a very adherent oxide layer like aluminum and SS.Galvanizing has two methods of corrosion reduction: Galvanized steel pipe is steel pipe that is dipped into a pool of zinc (see Figure 1). ![]() However, the high rigidity of steel means that although it expands less, it exerts very high forces on anchors. ![]() Consult ANSI/MSS SP-58: Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation for details about hangers and hanger spacing.Ī low coefficient of thermal expansion minimizes the need for expansion loops and expansion joints. More flexible materials, however, may require hangers on as close as 4-ft centers or even continuously. Steel pipe is manufactured in 21-ft lengths, and the hangers can be spaced that widely for large-diameter pipe. Rigidity is important because it determines the distance between hangers. Some building owners do not want these chemicals in steam that may be used for humidification because of health concerns however, not using these amines might require a change to stainless steel (SS) piping or adding a separate “clean steam” system for humidification and for sterilization of medical instruments. If amines (commonly cyclohexylamine, morpholine, or diethylethanolamine (DEAE) are fed properly to neutralize condensate pipe pH, condensate pipes can last the life of the building. However, corrosion is an issue in steam-condensate pipes, and many engineers specify schedule 80 steel pipe simply because it takes about twice as long to rust through as schedule 40 pipe. It also is a good choice for steam and steam-condensate systems because it handles high temperatures and pressures well, and corrosion is normally not an issue in steam pipes. 316 - which is more expensive?īuyers may find that the upfront cost is a little higher when it comes to 316 stainless steel, but the resistance to corrosion and rust could save a lot on the backend which is something to keep in mind when purchasing.Steel often is used for closed hydronic systems because it is inexpensive, especially when compared with other materials in systems with high pressures, and corrosion is relatively easily controlled in these systems. Stainless steels containing molybdenum are required in the manufacture of certain pharmaceuticals in order to avoid excessive metallic contamination. Type 316 is durable, easy-to-fabricate, clean, weld and finish.ģ16 stainless steel is considerably more resistant to solutions of sulfuric acid, chlorides, bromides, iodides and fatty acids at high temperature. Given that Type 316 stainless steel alloy contains molybdenum it has a considerable more resistance to chemical attack than 304. ![]() Type 316 stainless steel is an austenitic chromium-nickel stainless and heat-resisting steel with superior corrosion resistance as measured up to other chromium-nickel steels when exposed to many types of chemical corrodents.īuyers may find that the upfront cost is a little higher but could save alot on the backend which is something to keep in mind when purchasing. Type 304 stainless steel is used in enclosures, storage tanks, pressure vessels and tubing or piping. Type 304 stainless provides ease of fabrication and cleaning, prevention of product contamination and offers a variety of finishes. Type 304 proves to be resistant to oxidation and corrosion. Type 304, with its chromium-nickel content and low carbon, is the most versatile and commonly used of the austenitic stainless steels. The molybdenum is added to help resist corrosion. From a chemical or scientific standpoint the answer would be that 304 stainless steel contains 18% chromium and 8% nickel while 316 contains 16% chromium, 10% nickel and 2% molybdenum.
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