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Heat exchanger tubes

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Published: 01 November 2007
Fig. 3.22 Type 321 heat-exchanger tubes, which were manufactured by two different alloy suppliers, were tested in the same facility as described previously for preheating air at approximate metal temperature of 620 to 670 °C (1150 to 1240 °F) for about 1008 h. (a) Supplier A. (b) Supplier B More
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Published: 01 January 2000
Fig. 54 Stress-corrosion failure of a type 304 stainless steel heat exchanger tube from carbon dioxide compressor intercooler after exposure to a pressurized chloride-containing (200 ppm) environment at 120 °C (250 °F) (a) Cracks on the external surface. (b) Cracks originating on the external More
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Published: 01 January 2000
Fig. 5 A gelatinous biofouling slime layer on a heat exchanger tube sheet. The slime layer may be colored by dirt and other debris that accumulates in the gooey mass. Source: Nalco Chemical Company More
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Published: 01 January 2000
Fig. 7 Severely pitted aluminum heat exchanger tube. Pits were caused by sulfate-reducing bacteria beneath a slime layer. The edge of the slime layer is just visible as a ragged border between the light-colored aluminum and the darker, uncoated metal below. Source: Nalco Chemical Company More
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Published: 01 December 2015
Fig. 26 Pitting corrosion in Monel tubes from a heat exchanger. Each pit was originally covered by a discrete deposit containing large numbers of SRB. Source: Ref 9 More
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Published: 01 April 2013
(nickel and nickel alloy tube), E 690 (nonmagnetic heat-exchanger tubes), E 426 (stainless steel tube), and E 309 (steel tube). Source: Ref 3 More
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Published: 01 January 2000
Fig. 30 Horseshoe-shaped depressions on the internal surface of a brass heat exchanger tube caused by erosion-corrosion. Source: Nalco Chemical Company More
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Published: 01 November 2007
Fig. 3.19 Surface depletion of chromium observed in a thin-gage commercial heat-exchanger tube in the as-fabricated condition made from Type 321. Source: Ref 30 More
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Published: 01 December 2015
Fig. 9 Example of high-temperature sulfidation attack in a type 310 heat-exchanger tube after ~100 h at 705 °C (1300 °F) in coal-gasifier product gas More
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Published: 01 December 2015
Fig. 3 Uniform-layer dezincification in an admiralty brass 19 mm (3/4 in.) diameter heat-exchanger tube. The top layer of the micrograph, which consists of porous, disintegrated particles of copper, was from the inner surface of the tube that was exposed to water at pH 8.0, 31 to 49 °C (87 More
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Published: 01 January 2000
Fig. 20 Severe localized corrosion on a type 316 stainless steel heat exchanger tube. Attack occurred beneath deposits, which were removed to show wastage. Source: Nalco Chemical Company More
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Published: 01 November 2007
Fig. 3.21 Scanning electron micrograph (backscattered electron image) showing the oxide scales formed on the outside diameter of the heat-exchanger tube (from the same batch of tubes that showed surface chromium depletion) exposed to air for 6 months. Energy-dispersive x-ray spectroscopy (EDX More
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Published: 01 January 2015
Fig. 15.21 Titanium tube bundle for heat exchanger More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220077
EISBN: 978-1-62708-341-6
... is passed through the tubes of a “water-to-water” exchanger, cooling the distilled water but not mixing with it. The temperature-demand valve remains connected to the tap waterline. With small induction heaters (7.5 kW or less), water-to-air heat exchangers, similar in construction to an automotive radiator...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
...: Ref 8 Fretting corrosion has been a continuing problem in nuclear reactors. The condition is found on heat-exchanger tubes and on fuel elements. In both cases, long, flexible tubes are in contact with support surfaces and subjected to vibrations generated by fluid flow as the coolant flows...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430379
EISBN: 978-1-62708-253-2
... in water also lead to the fouling of heat transfer surfaces and eventually lead to failure of the tubes by overheating ( Ref 7.1 ). Therefore, quality control of the boiler water is of utmost importance and can be ensured through control of the chemistry of the water entering the boiler. The purposes...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... through the power supplies, heat stations, and quench tanks. If the cooling water used for heat exchange has much hardness, calcium deposits can form on the plates or tubes of the heat exchangers, which reduce the ability of the heat exchangers to extract heat. It is recommended that, depending upon...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430343
EISBN: 978-1-62708-253-2
..., inadvertent use of acids and caustic chemicals can cause damage to the boiler. The presence of either of these chemicals can cause corrosion of the boiler tubes. The failure of any process equipment such as heat exchangers and pumps is normally a source for ingress of oils and process chemicals...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430087
EISBN: 978-1-62708-253-2
... at relatively higher temperature in the creep range and they ensure heat transfer between the hot flue gases and the high-pressure steam passing through them. The economizer tubes act as a heat exchanger. They extract heat from the waste gases that exit the last SH or RH and utilize this heat to raise...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340265
EISBN: 978-1-62708-427-7
... by the process described in Chapter 10 in this book from brazing sheet and fin stock products that are clad, on one surface at least, with a low-melting-point 4 xxx alloy. Most aluminum heat exchangers are manufactured as brazed tube and fin assemblies with the metallurgical joint providing the optimum...