ABS-24-1980.pdf
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1、Guidance Manual for Material Selection and Inspection of Inert Gas Systems 1980 American Bureau of Shipping COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services -i _- _ _ _ _ _ - ABS TITLE*GMSI
2、GS 80 Ob51102 0003283 215 t Guidance Manual for Material Selection and Inspection of Inert Gas Systems 1980 American Bureau of Shipping Incorporated by Act of the Legislature of the State of New York 1862. 01980 American Bureau of Shipping 65 Broadway New York, New York 10006 U.S.A. COPYRIGHT Americ
3、an Bureau of Shipping Licensed by Information Handling Services COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services Guidance Manual for Material Selection and Inspection of Inert Gas Systems It - 1.0 Introduction 2. O 3.0 Inspection 4.0 Testing 5. O Applications General C
4、haracteristics of Materials Appendices A Typical Inert Gas System B Bureau Offices COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services ABS TITLE8GMSIGS 80 m 065LL02 0003285 O98 m Foreword This
5、 Manual is intended to summarize available information on the suitability of various materials for the many components of inert gas systems used on board merchant ships, and incidental information relating to maintenance, inspection, and testing. This information is based on a review.of available te
6、chnical literature, discussions with inert gas system manufacturers, and comments from the ABS Spe- cial Committee on Ship Operations and its Ad Hoc Committee on Inert Gas Systems. The document is intended to describe the state of the art as reported to the Bureau and should not be construed as an e
7、xpression of ABS recommendation or preference. The Bureau has established a program to acquire further informa- tion relative to the service performance of various materials in inert gas systems and expects to include the results of this study in a future revision of this Manual. COPYRIGHT American
8、Bureau of Shipping Licensed by Information Handling Services COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services - - - _ _ _. - ABS TITLExGflSIGS 80 0653302 0003286 T24 = Guidance Manual for Material Selection and Inspection of Inert Gas Systems 1.0 Introduction 1.1 Gener
9、al This Manual is intended to provide information relative to ? the selection, maintenance, inspection and testing of materials for inert gas systems using flue gas derived from ships? boilers. Separate gas generating plants which generally use low sulphur fuels have less corrosive environments and
10、some of the comments contained herein may not be applicable. 1.2 Application This Manual shuld be applied in conjunction with a careful assess- ment of the conditions associated with the particular design and maintenance schedule of the inert gas system under consideration, so that the guidelines ca
11、n be applied to establish requirements for the expected service conditions. 1.3 Flue Gas Corngosition This Manual is based upon a typical flue gas composition as shown below. It is expected that minor variation could be expected in operation. Gas 7 Vol. N2 80 CO2 12- 14 0 2 2- 42 CO Traces NO Traces
12、 Water Vapor special precautions should be taken to prevent such espo- sures. These precautions may provide for precooling of gases or siiitable controls to preent hot gas flow. To avoid inadvertent overheating, the outside surfke of rubber or FRP lined pipe or chambers should lie clearly marked to
13、indicate “Welding or Heating not Permitted on this Surface”. 2.1.2 Erosion or Vibration The use of materials lined with rub- ber or FRP should lie avoided under conditions vhere the. ma- be eroded by high velocit. flovs of air or vater. For some npplications, excessi*e vibration has lieen reported a
14、s a cause of damage of the liond to the underlying niaterial. Particulur care should lie taken to assure the attainment and maintenance of xi unbroken coating vith i satisfactory bond in rubber or FRP coated niriterinls during manu- facture, installation, mriintenance and inspection. The use of coat
15、- ing soundness tests such as spark testing should be considered. Close attention should be given to avoid coating failures since such Failures are usually not detected until severe damage has occurred and such failures ma. not be easily repaired under field conditions. 2.1.4 Epo.xy Paints and Tars
16、5laterials coated with epoxy paints or epoxy tars ma) be susceptible to erosion damage and peeling from minor surface flaws. These coatings are general1- not consid- ered as durable is rubber or FRP lined materials and should only be considered if appropriate supporting data is available to indicate
17、 their suitability for the intended service qiplication. However, some instances where these coatings have proven to be satisfiictory are indicated in 5.0. Zinc silicate paints are reported to exhibit excessive corrosion rates in acidic environments. 2.1.1 Ocerheatitig 2.1.3 Coating Soundness 2.2 Fe
18、rrous haterials 2.2.1 Cast Iron These niaterials are considered generally satis- factory for inert gas valves, but should not be used n-ithout suitable linings or protecti.e coatings in environments where acidic soot nia!- acciiin date. 2 COPYRIGHT American Bureau of Shipping Licensed by Information
19、 Handling Services COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services -. 2.2.2 Carlmu Steels 2.2.3 Artstcwitic Stninless Stc3el.s t iicl carl)oii steclls should iiot he used witli- o11 t suitable liii i iigs o i - 11 i-otver, particular attention shoiiltl lit: gi.c.ri to
20、 ass U re that kip p ro p ri a te w e Id in g procedures are c I sed. Coppet- nickel alloys are used in the salt water cooling systems. Bronze and brass alloys do not perform cis well as these applications but have been used on occasion. 2.3.3 Titanium Alloy$ Titanium alloys are satisfactory for use
21、 in severe corrosive conditions such as those encountered inside the scrubber. However, their relatively high cost minimizes their use. 2.3.2 Copper AZZogs 3.0 Inspection 3.1 General A general inspection to veritls, lc;ikiige*s, interlocks, flow and gas analysis aiid vilmition lt*vc*ls. Progruiiis c
22、vluivaleii t to those of the Inter- tiutioiiul Cliaiiilwr of Sliippiiig Iriert Fliic* Gas Safety Giiide 1978 will 1)cx coiisidcrctl to liiivv iiivt this rcqiiirc*iwiit. 5.0 Applicatioiis I 4 COPYRIGHT American Bureau of Shipping Licensed by Information Handling Services COPYRIGHT American Bureau of
23、Shipping Licensed by Information Handling Services J Uptake Valve Mlve sliould l)e located :tway froin the econoiiiizer to avoid prob- lems of valve janiiniiig. Valves located close to the econoinizer liave been prevented from closing tlirougli layers of ferrous salts washed into and hardened on the
24、 bottom of tlie valve body from fresh water 5r washing of the econoinizer. ri air sealing system and soot 1)lowiiig of the valve seating aiid disc slioiild he employed to improve tlie sealing function of the valvc. The fornier escliidcs corrosive gases from tlie flue gas line by ensuring a positive
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