1、Guidance Manual for Material Selection and Inspection of Inert Gas Systems 1980 American Bureau of Shipping COPYRIGHT American Bureau of ShippingLicensed by Information Handling Services-i _- _ - ABS TITLE*GMSIGS 80 Ob51102 0003283 215 t Guidance Manual for Material Selection and Inspection of Inert
2、 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 American Bureau of ShippingLicensed by Information Handling ServicesGuidance Manual for Material
3、 Selection and Inspection of Inert Gas Systems It - 1.0 Introduction 2. O 3.0 Inspection 4.0 Testing 5. O Applications General Characteristics of Materials Appendices A Typical Inert Gas System B Bureau Offices COPYRIGHT American Bureau of ShippingLicensed by Information Handling ServicesABS TITLE8G
4、MSIGS 80 m 065LL02 0003285 O98 m Foreword This 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 in
5、formation is based on a review.of available technical 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
6、the Bureau and should not be construed as an expression 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 futur
7、e revision of this Manual. COPYRIGHT American Bureau of ShippingLicensed 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 General This Manual is intended to provide in
8、formation 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 some of the comments contained herein ma
9、y 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 can be applied to establish requirements f
10、or 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 02 2- 42 CO Traces NO Traces Water Vapor special precautions should b
11、e 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 indicate “Welding or Heating not Permitte
12、d 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 as a cause of damage of the liond to the u
13、nderlying 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- ing soundness tests such as spark testi
14、ng 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 5laterials coated with epoxy paints or ep
15、oxy 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 their suitability for the intended servi
16、ce 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 Ferrous haterials 2.2.1 Cast Iron These nia
17、terials 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 ShippingLicensed by Information Handling Services-. 2.2.2 Carlmu Steels 2
18、.2.3 Artstcwitic Stninless Stc3el.s t iicl carl)oii steclls should iiot he used witli- o11 t suitable liii i iigs oi- 11 i-otver, particular attention shoiiltl lit: gi.c.ri to ass U re that kip p ro p ri a te we Id in g procedures are c I sed. Coppet- nickel alloys are used in the salt water cooling
19、 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 in severe corrosive conditions such as those encountered inside the scrubber. However, their relatively high cost minimizes t
20、heir 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 cvluivaleii t to those of the Inter- tiutioiiul Cliaiiilwr of Sliippiiig Iriert Fliic* Gas Safety Giiide 1978 will 1)cx coiisid
21、crctl to liiivv iiivt this rcqiiirc*iwiit. 5.0 Applicatioiis I 4 COPYRIGHT American Bureau of ShippingLicensed by Information Handling ServicesJ 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 b
22、een prevented from closing tlirougli layers of ferrous salts washed into and hardened on the 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
23、valvc. The fornier escliidcs corrosive gases from tlie flue gas line by ensuring a positive air pressure down- stream of the valve and the latter ensures the efficiency of the valve by effectively cleaning the valve disc and seat. An interlock between uptake valve and boiler soot blower system shoul
24、d be employed. Materials: Cast iron Ordinary 450C Cast steel Incoloy 825 Flue Gas Line Any entry ports or temperature/gas take off points should be as flush as possible with the pipe walls to prevent accumulation of damp, acidic soot. 1f.accumulation of acidic soot occurs penetr a t ion can occur ra
25、pidly. Gas line should drain to a low point to prevent accumulations of corrosive condensate. Materials: Heavy gauge low alloy improved corrosion resistance steels such as ASTM A606, A607 Al coated mild steel Expansion Bellows Bellows should be fitted in vertical position to avoid soot accumu- latio
26、n. Bellows should be flanged to the flue gas line and not welded to facilitate maintenance. Bellows of high alloy material such as Incoloy 825 should not be welded to mild steel flanges as the welded junction may become amenable to corrosion. If the bellows are fitted with internal support sleeves t
27、hen precautions should be taken so that soot does not accumulate. Materials: AISI 316L Inco ne1 625 Incoloy 825 Has telloy C276 Rapid penetration of AISI 316L occurs due to pitting if soot accumulates. 5 COPYRIGHT American Bureau of ShippingLicensed by Information Handling Services6 ABS TITLE*GMSIGS
28、 AO Ob51102 00032L31 391 Sea Water System :i Sccr Wfcr I,ws Mcitrritils: W/IO (hi Ni 111 I)roiizv FIW I) 141lt:cs AfcrtJricr1.c Cut stc-cal valvcas witli riilhc*r or IW liiicd 1)odivs AISI 3161, typt shh Ni AI I)roiizc discs witli iiyloii coat iiig. t c 11m1ps Iin p cl1 e rs hleitcricrls: Motid Ni A
29、l 1)rotize Cast stccl coutecl with a1)msioti resistant paints Notiirie tallics Erosioti prol,lottis chie to casting porosity may occur with irioticl arid Ni Al hrotizc. Matericrl.v: Cast steel coated with almsiori resistant paints. When the piping is not transporting fresh water, it is being exposed
30、 to corrosive gases and salt writer. Mntericrls: 90/10 Cu Ni-inside the scrubber Mild steel-outside the scrubber FRP cusing d Fresh Wuter Lines e Sprayers The erosion resistance of the material used should be high to maiti- tain ditrietisiotial precision. Mnkricik Ni Al bronze 70/30 Cu Ni AISI 316L
31、Itieoloy 825 Iticoloy 825 should be used for precoolers located in warm area of the scriibher close to the gas entry. As little cdtliierit us possihle slioiild 1 Icft over it1 these lines as the effliient is liiglily iicidic. hlcrteriah: AISI 316L 98/10 Cu Ni Al hnze Steel 1itit.d with rd)lwr, FRP,
32、PVC or plastic Higid FRP or PVC AISI 3161, W/lO Cu Ni, Al 1)rotizc slioiild 1). iisc1 in ;irt;is where acidic. salt wntvr t1oc.s tiot iicciitiirilatc. AISI 3161, iiikiy pit iiiider soiiic iiortd tlesigti flow coticlitioiis. Stwl litid with riilhcsr, FRP, PVC or plastic slioiild I)c iisetl iti area w
33、htw effliiciit iiiay acciimii- latct. E”) liiiitig ttiuy 1i;ivc: laying ;iid c2cliitiiitiitioti pro1)leiti.s. f Efluent Lines COPYRIGHT American Bureau of ShippingLicensed by Information Handling Services_ _ _- - ABS TITLE*GMSIGS BO 0651102 0003292 228 Scrubber a Inlet Foot hci t c r-ici Is: I II co
34、 lo y 825 Titan iutn Inconel 625 Hastelloy C276 Ail welding with Incoloy 825, titanium, and Inconel 625 slioiild he sone under controlled conditions. Ma te ria Is : Mo II e 1 400 90/10 Cu Ni Incoloy 825 b Salt Water Inlet Pipe Monel 400 has been found to last only a few months in service. The bottom
35、 part of the scrubber could be under stagnant salt water during shut down and be subjected to warm acidic salt water and corrosive gases during inerting operation. Materials: S teel lined with rubber Steel lined with fibre glass reinforced epoxy resin Steel lined with FRP Incoloy 825 Ferralium c Bot
36、tom Part Steel lined with rubber cannot be efficiently repaired. It can stand up to higher temperature than FRP. Steel lined with FRP can suffer delamination if overheated. Its repair is generally easier and more satisfactory than that achieved with rubber lining. The materials satisfactory for the
37、bottom part can be used satic- factorily for the upper part as the service condition is less severe. Materials: Painted AISI 316L d Upperpart S teel coated with coal tar epoxy Steel lined with rubber or fibre glass reinforced epoxy resin e Float Switches Pressure switch or ultrasonic device may be u
38、sed instead of float switch. Materials: Monel Stainless steel Steel coated with stove epoxy, plastic, PVC or FRP Monel and stainless steel are not satisfactory if kept immersed in stagnant water. f Internals Mci fe rids: AIS I 316L FRP Incoloy 825 FRP can delaminate if exposed to high temperatures.
39、7 COPYRIGHT American Bureau of ShippingLicensed by Information Handling Servicesa ABS TITLEWGMSIGS BO Ob53302 0003293 3bli Colcl Gas Line Q Blowers IinpeZZers lli sliaft slioiild lie fully siipported on both sides. Coatd iinpc*llcrs shoiild riot lic iisctl as my loss of coatiiig will result iii sevt
40、w iihiliiice aiid corrosioii. A fresh water wash should be iised to uvoid lmilcliip of soot, which could caiise iin1)alance aiid corrosion prohlenis. Mciteticr1.s.: Ni Al bronze AISI 316L Iricoloy Y25 Fd)ricatec1 ferruliiriii (25 Cr 5 Ni 2 Mo) Cast fr.rr. rl I 111111 IIustelloy G (23 Cr 25 Ni 5 Mo)
41、INCO IN 862 Has tc4oy C Ti tuiiiiiiii Iricorit4625 There inay hi erosioii aiid corrosioii problems with Ni Al bronze if stress rdiw*itig is riot pon ROMANIA Hraila (ialatz ISRAEL IIaifa SAUDI ARABIA Dammam Ras Tanura JdU ITALY Cema Naples Palerma Trieste Venice Ida SpCLia NETHERLANDS Groningen Hotte
42、rhin SENEGAL Dakar SIEHRE LEONE WEST AFRICA Freetown IVORY COAST WEST AFRICA AIiidjaii* SINGAPORE, REPUBLIC OF NICARAGUA Managua SOUTH AFRICA Cape Town Durban Port Elizaheth SPAIh Barcelima Rilldli CddiZ El Ferrol iijon Madrid Valeiicia Vi$.i KORTIIERN IRK1,ANU Hc1f;trt KENYA, EAST AFRICA hfmihsd* 1
43、6 COPYRIGHT American Bureau of ShippingLicensed by Information Handling Servicesd! ! i 1 ? i ABS TITLE*GMSIGS BO SiVEDEN Gottienliiirg EIjarnaro Liilea Oreliro slockioliii SWITZERLAND Lucerne TAHITI 1SLAN.F. Papeete TEIALAND Raiigkok TURKEY Istanbul UNITED ARAB EMIRATES Dubai UNITED STATES Baltimore
44、 Beaumont Boston Chicago i I ? 17 ! ! W 0653302 c:lcvile Nashville New Orleans Newport News Sew York Pliilatlelptiia Pi ttsiiirgli Portland St. Louis San Diego San Francisco Savannah Seattle Tampa URUGUAY Montevideo 0003300 124 VEXEZUELA Caracas Xlar;ic;iilo Iiierto Caliello Piicrto Ordaz LVEST INll
45、IES ISLANDS I3ritlgctowii. I3;irliatlos Ciilc;io, K. A. (:iiacleloiipe. hlartiiiiqiie* Port of Spain, Trinidacl PUERTO RICO Saii JiIai1 DOMINICAN REP. Santo Ihniingo VIRGIN ISLANDS St. Thomas YEMEN, A.R. Hodeidah YEMEN, P.D.R. Aden YUGOSLAVIA Split COPYRIGHT American Bureau of ShippingLicensed by Information Handling Services
