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soil

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Published: 01 January 2002
Fig. 5 Rate of corrosion of unprotected steel in biologically active soil as a function of iron sulfide present More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091384
EISBN: 978-1-62708-219-8
... Abstract A 25.4 cm (10 in.) diam gray cast iron water main pipe was buried in the soil beneath a concrete slab. The installation was believed to have been completed in the early 20th century. A leak from the pipe resulted in flooding of a warehouse. Once removed, the pipe revealed through-wall...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046535
EISBN: 978-1-62708-234-1
... in the backfill revealed the site of failure. Analysis (visual inspection, electrical conductivity, and soil analysis) supported the conclusions that the failure had resulted from galvanic corrosion at a point where the corrosivity of the soil was substantially greater than the average, resulting in a voltage...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047335
EISBN: 978-1-62708-219-8
... Abstract A section of cast iron water main pipe contained a hole approximately 6.4 x 3.8 cm (2.5 x 1.5 in.). The pipe was laid in clay type soil. Examination revealed severe pitting around the hole and at the opposite side of the outside diam. A macroscopic examination of a pipe section...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091208
EISBN: 978-1-62708-220-4
... since start-up of the tank operation. It was noted, however, that some operational problems with the rectifier may have interrupted its protection. Investigation (visual inspection, on-site examination and testing, EDS analysis of scale deposits, and MIC testing of the soil) supported the conclusion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091806
EISBN: 978-1-62708-219-8
... Abstract A failure occurred in buried brass (92% Cu, 8% Zn) piping used to carry drinking water in wet clay soil after less than two years in service. Investigation (visual inspection, chemical analysis of both the pipe surface and water, and a comparison of the corrosion failure of power...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091292
EISBN: 978-1-62708-219-8
... the pipe was buried in noncorrosive sandy soil, it was found to incur stray currents at 2 Vdc in relation to a Cu/CuSO4 half cell. Recommendations included eliminating, moving, or shielding the source of stray current. Pipe couplings Stray current corrosion Water treatment systems Copper pipe...
Image
Published: 01 January 2002
Fig. 7 Current demand needed to sustain a set CP potential increases with time for steel in soil as SRB produce increasing quantities of iron sulfide. More
Image
Published: 15 January 2021
Fig. 16 Current density needed to sustain a set cathodic protection potential as a function of iron sulfide present in biologically active soil box experiments under anaerobic conditions More
Image
Published: 15 January 2021
Fig. 5 Rate of corrosion for steel sustained over a six-week period in biologically active, wet, high-clay soil as a function of iron sulfide present under anaerobic conditions in laboratory tests. SRB, sulfate-reducing bacteria More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001765
EISBN: 978-1-62708-241-9
... ]. In another experiment, it has been shown that disbonding increased almost tenfold as the coating thickness decreased from the 65 mils range to 20 mils range [ 3 ]. The severity of underside corrosion is directly related to the corrosivity of the soil, which depends on a number of soil parameters...
Image
Published: 15 January 2021
Fig. 3 Corrosion scenario under a disbonded polyolefin tape wrap coating on a buried pipeline in wet, anaerobic, high-clay soil features soft, black corrosion products rich in iron sulfide, FeS, and iron carbonate, FeCO 3 , overlying severe pitting. More
Image
Published: 01 January 2002
Fig. 1 The pH and oxidation reduction potential for growth of anaerobic bacteria able to reduce nitrate or sulfate (dots in plots) and for soils dominated by the microbial metabolism (boxes). Aerobic bacteria grow over a wide range of pH at E h > 300 mV (normal hydrogen electrode More
Image
Published: 01 January 2002
Fig. 42 A 25 cm (10 in.) diam gray cast iron pipe that failed due to graphitic corrosion. The pipe was part of a water supply to a fire protection system. The external surface was covered with soil and the inside surface in contact with water. The pipe had been experienced cracking and through More
Image
Published: 01 June 2019
Fig. 1 A 25 cm (10 in.) diam gray cast iron pipe that failed due to graphitic corrosion. The pipe was part of a water supply to a fire protection system. The external surface was covered with soil and the inside surface in contact with water. The pipe had been experienced cracking and through More
Image
Published: 15 January 2021
Fig. 42 A 25 cm (10 in.) diameter gray cast iron pipe that failed due to graphitic corrosion. The pipe was part of a water supply to a fire-protection system. The external surface was covered with soil and the inside surface in contact with water. The pipe experienced cracking and through More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001697
EISBN: 978-1-62708-219-8
... and the soils surrounding the pipes (for those pipes that were in below ground use), and scanning electron microscopy. Visual and microscopic examinations revealed pitting corrosion at the outer (OD) and inner (ID) diametral surfaces of every pipe section that was tested ( Figures 1 & 2 ). Pitting...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
... of anaerobic bacteria able to reduce nitrate or sulfate (dots in plots) and for soils dominated by the microbial metabolism (boxes). Aerobic bacteria grow over a wide range of pH at E h > 300 mV (normal hydrogen electrode). Source: Ref 19 Whatever the metabolism, electrochemical reactions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001721
EISBN: 978-1-62708-225-9
... for the corrosive environment of the bonnet screws is the soil in which the valves are buried. Often times, especially in urban areas, the soil contains significant levels of ammonium and calcium due to fertilization. The salting of streets in the winter can lead to high levels of salt in the ground water...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006788
EISBN: 978-1-62708-295-2
... soil in the presence of near-neutral pH groundwater is often very fast came as a surprise to early investigators and was attributed somewhat intuitively to MIC. The original mechanism proposed ( Ref 18 ) coupled microbial sulfate reduction to the oxidation of iron: (Eq 5) 4Fe + SO 4 2...