in sea water applications. Nice to see update from you . Urethanes/Polyurethanes often work well in seawater, but it would be wise to consult the manufacturer of the particular material to be sure. This is cast equivalent for 316 grade. Engineering / Consulting Firm Sacrificial or impressed current cathodic protection system is used for external corrosion protection. To solve the problem of seawater corrosion, we usually choose titanium, (Super) duplex steel, nickel aluminum bronze, or austenitic stainless steel to manufacture valves, which feature corrosion-resistance and washing-out resistance, ensure service life and longer replacement cycle, and help you save costs and improve the reliability of desalination. 6061 aluminum bracket, 316 stainless nut, brass bulkhead connector, PVC pipe, and polyurethane cable after 155 days in the ocean. The real question is whether it will corrode enough to affect your particular project. I am sorry , I was traveling and could not write. The stainless steel screw would start to corrode too. Industrial Automation Fiazal Hussain CEng MIMMM What I see is that if a threat is valid or not in first place for worst possible conditions in a System. He utilizes his onboard and technical experience to assist customers,from design concept to ship repair, to provide the proper product, service and advice theyneed. These were metal seated butterfly valves for bi-directional Class VI shutoff. Sea water is highly saline -3. Seawater applications can be very demanding on the performance of the valve material. Resistance to deaerated seawater is a major factor considered in the desalination industry that serves under low oxygen brines and where cupronickel alloys are used for heat exchangers. Also be careful with 304 (a.k.a. As seawater is only one of the many mediums that flow through valves. NaCl is strong electrolyte and dissociates as Na+ & Cl- completely. They offer better performance to crevice and pitting media. 3. Oil & Gas Andry, a good share and appreciate your input/sharing of knowledge. The efficiency of the seawater battery is 17.56% less than an alkaline battery. Seawater corrosion is very huge topic and I definitely welcome any improvement suggestions and also corrections. This has been very succesful in eliminating corrosion/pitting and is a fraction of the cost of Titanium. The answer to that is "Yes." Maximum velocity limit in material is rarely achieved because most of the time, engineering design economics such as pump sizing and friction loss resulted in lower velocity requirement, also there is risk for water hammer. Many people have given good comments. That can be prevented. 316L is not a suitable alloy for handling seawater. Galvanised steel. Industry Many thanks. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. I put a layer of fiberglass cloth in the layup where the rod was bonded in to make sure that the 316 stainless and the carbon fiber did not make electrical contact. damage.2 Additional tests on grade 2 titanium show resistance to erosion at velocities up to 18 ft/sec (5.5 m/sec) with silt-laden seawater and above 100 ft/sec (30.5 m/sec) in silt-free seawater.3 Lower flowrate coupled with large volumes of abrasive particles can, however, break down the titanium oxide film, Seawater contains approximately 3.5% salt (sodium chloride) and is slightly alkaline (pH 8). Contents of the table are just rules of thumb and likely stringent for cautionary purposes. excellently worded Tauqir, I always write that the table is just a rule of thumbs, it is responsibility of engineers to design fit for purpose solution, Andry Soetiawanwhere are you now? Check out. This Tech Tip is only meant to be an introduction to the subject, but hopefully it will get you started on the right path to avoiding or minimizing corrosion. You will not get corrosion at all then. The selection of materials for equipment in seawater treating must take into account the pressure rating of the application, the corrosivity of the fluid, and the end-use location. Bronze pumps are commonly specified for use on seawater, hot water and certain chemicals. Without any insulation between the materials, the aluminum would corrode very rapidly. In the latest plants the whole distillate system is usually constructed in grade 316 stainless steel as the high purity water is severely corrosive to carbon steel. The real question is whether it will corrode. If the application is critical or longevity is a concern, an inherently corrosion resistant material such as copper-nickel should be considered. They can be smooth enough and non-porous enough. The most common commercially available valve material for seawater is bronze, (B-62 Alloy C83600). Nickel alloys also do well, and there may be other less-common metals that will work well too (such as gold, but Im guessing your budget wont permit its use). Although type 316 has superior resistance to corrosion in sea water compared to other "18-8" "Stainless" (Corrosion Resistant) Steels, it is still subject to pitting (especially when or where the water is stagnant). The choice of the right pump and of the right stainless-steel materials suitable for seawater has a crucial impact on the plant availability and, of course, also on its economic viability. Corrosion and ultimately valve failure can be minimized by the use of proper alloy. This combination can offer a longer life cycle for valves used in sea water applications. The material we use most is 316 stainless steel, or 6Mo stainless steel. 5% salt content Low Carbon Steels. In other words, it's almost always the RATE of corrosion that matters. with paint, bitumen, rubber, cement, mortar) Stainless steels. If youre trying to make a waterproof enclosure with a 3D-printed part made on your own 3D printer, good luck. Steel if not, any other alternatives ? Email: sales2@super-metals.com, Beijing Office/Workshop in China:
Bare 6061 aluminum (the most common alloy) is okay, but anodization will make it better. Special attention for small details such as elastomers, pump parts or valve components, sometimes they are not made from seawater & chlorine resistant materials. System Application: Cattle trough water supply
Thanks to Mushahid & Anupkumar for reminder about FRP UV degradation concern. 304 stainless is much more prone to corrosion than 316 stainless, and is generally not recommended for use in seawater. body and internal materials are of 18-8 SMO stainless steel. Steve began his career as a deckhand on the Mississippi River progressing through theindustry through different positions and opportunities. Trim materials can range from iron to exotic alloys. Carbon steel internally coated or lined (e.g. But if you just use a plastic sleeve around the screw and plastic washers between the carbon fiber and aluminum, you shouldnt have a problem (this technique was used to separate the aluminum piece from the stainless screw and nut in the picture above). That's why I raised it earlier. The picture to the right is a great illustration of these principles. If the material is ductile iron, any pinhole in the coating will allow contact with seawater, and that area will be subject to rapid corrosion. Email: sales1@super-metals.com. the cost will be significantly less than the ss you have suggested. both phna derived from na625 and, like na718, are strengthened by and phase. The best material, disregarding cost, has been Titanium. above 400 C design temp (ASTM A335 Gr P1, 5, 11, 22, etc.) Please share the table. Some of these non-oxidizing mineral acids include phosphoric, sulfuric; organic acids such as lactic, acetic or oxalic; neutral saline solutions such as sodium chloride or potassium chloride and alkalies such as sodium hydroxide, potassium hydroxide and ammonium hydroxide. To view or add a comment, sign in. Water/Wastewater CS Cement lined pipe normally used in seawater applications Alloy Steel (AS) - Also known as Cr-Mo steel Pipe Selection Used for high temp applications in CS base like process services, superheated steam, reformer gases, etc. It shows the front end of SeaCharger's thruster pod after 155 days in the ocean. If using phone apps, I agree that the table can't be zoomed in but you can still see it there, need to use computer to see bigger version. Andry Soetiawan Thanks Andry, issue resolved. The most common commercially available valve material for seawater is bronze, (B-62 Alloy C83600). Hello again M&C colleagues, hope everyone is always in fantastic condition. Urethanes/Polyurethanes often work well in seawater, but it would be wise to consult the manufacturer of the particular material to be sure. It is not recommended to use stainless steel of the type AISI 316 or AISI 316L in stagnant seawater. And if you look closely, you can see tarnishing of the brass bulkhead connector (just to the left of the bright white piece), which is also just a cosmetic issue. The main types of material to be considered for seawater piping systems are: Copper alloys, particularly the copper-nickel series. Valves for Seawater Application. Other, Example: Yes, I would like to receive emails from Empowering Pumps and Equipment. 1. When considering the cost of material remember that you need equal size (volume) not weight of the material. The common industries are desalination and offshore oil and gas production. Materials of high impingement resistance, such as nickel aluminum bronze or cast 70-30 Cu-Ni, are recommended when this type of valve is chosen. It also describes various phenomena associated with corrosion and abrasion. Chemicals / Petrochemicals Sintered bronze is a porous material, which can be impregnated with oil, graphite or PTFE. The performance of austenitic stainless steels that basically contain iron and also include chromium and nickel. Internal corrosion is mainly due to presence of water and sulfur content which may lead to sulfide stress corrosion cracking (SSCC). These alloying agents are able to react with the oxygen in the air, or in the water in marine environments. . 304L is the best material for nitric acid and certain other chemical service applications. Centrifugal force moves water towards the outside of the cylinder., Your email address will not be published. Just make sure you check their UV resistance and water resistance. The chlorides in seawater make the stainless susceptible to failure from pitting and stress corrosion cracking. Click Here to join Eng-Tips and talk with other members! Have you considered using a thermoplastic material? 1. There is some corrosion on the 316 stainless nut, but again, not enough to matter in this application (by the way, this seems to be "crevice corrosion," another topic to research if you're interested). Application is sea water, but I am working for valves not pumps. In case you need any cast components you may contact me. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Delrin (a brand name of acetal or POM) is a great material for use in the ocean. Inspection of offshore pipeline is another hurdle. You might try asking about this. 3D-printed parts could work but make sure you test them to make sure they dont soften in water and that they are strong enough for the application. The addition of 10-11.5% Aluminum to the copper alloy almost triples the tensile and yield strength of the material. Nickel based alloys for example Monel 400, austenitic stainless steels and other super alloys have offered supreme performance in the marine industry over the years. Just make sure that the sleeve and washers have a bit of thickness to them, since you can get galvanic corrosion if the materials are almost touching even if they arent actually touching. Pak Andry, nice one. Aluminum Bronze can be used for both the body and trim of the valve in seawater applications. Tel: +86-186-1276-6845
Though, I am more interested to know why the threat of MIC has been discarded for 6Moly and SDSS whereas DSS has not been discarded. I believe SS 416 and 316 are resistant to salt water. I've actually seen several corrosion resistance guides that say that 304 is better for sea water. Although it is not 100% the same as an alkaline battery, 82.44% efficiency is a high value to be compared. Hi Sanjay, coating + CP is one of the solution, but I would say the most effective corrosion mitigation in seawater environment is the one that fit for purpose. It is expensive, but usually worth it for critical applications. Please let us know here why this post is inappropriate. . CP in combination with coating is one of the most cost efficient way to mitigate seawater corrosion, it generally applies limited to external surface of material, although internal is possible but only for non-complex design such as storage tanks. 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