Alloy 22 Pipes, Pipe Fittings & Flanges in Pharmaceutical Plants

Alloy 22 sheet can be readily fabricated into pipes, pipe fittings and flanges. NeoNickel’s alloy 22 is widely used in mechanical design and fabrication of process equipment. On this occasion, alloy 22 pipes, pipe fittings and flanges (fabricated from sheets) were used to upgrade an existing PTFE CAC (Chlorine Acetyl Chloride) transfer line in a pharmaceutical plant. An existing de-commissioned PTFE line was replaced by the alloy 22 line in order to ensure that the system complied with safety requirements. The CAC line was used for transferring chlorine acetyl chloride found in the pharmaceutical products manufacturing process.

Alloy 22 is a fully austenitic, nickel-chromium-molybdenum-tungsten alloy with excellent corrosion resistance. The high chromium content provides good resistance to oxidizing conditions while the molybdenum and tungsten give good resistance to reducing media. This alloy provides exceptional resistance to pitting, crevice corrosion and stress corrosion cracking as well as general corrosion. NeoNickel offer a competitive package of alloy 22 pipes, pipe fittings & flanges with fast response and delivery.

Corrosion rates in mixed acid media with chlorides & fluorides **Uniform corrosion mils/year
Corrosive media	Temperature	C22	C276	C4	625
6%HF + 5% HNO₃	60°C	67	207	204	73
1%HF + 5% HNO₃	Boiling point	0.5	8	11	1
25%H₂SO₄ + 5% HNO₃+ 4%NaCl	Boiling point	12	64	97	713
23%H₂SO₄ + 1.2%HCl + 1% FeCl_{3 +}1%CuCl₃	Boiling point	7	55	2294	3847

Alloy 22 is widely used in the construction of process equipment in the chemical, fine chemical, pharmaceutical, bio pharm, pesticide and nuclear fuel reprocessing markets. This is because alloy 22 has outstanding corrosion resistance in a wide variety of chemicals including oxidizing acid chlorides, wet chlorine, formic acids, acetic acids, ferric chlorides, cupric chlorides, sea water, brine and other mixed or contaminated chemical solutions (both organic and inorganic). Moreover, alloy 22 resists the formation of grain boundary precipitates in the weld heat affected zone, making the alloy suitable for most chemical process applications in the ‘as-welded’ condition.

Contact NeoNickel for your materials selection, quality controlled, and metallurgical consulting service for similar applications.