ASME AG-1A-2009 pdf free download.Code on Nuclear Air and Gas Treatment.
A-31l0 NIATFRIAIS OF CONSTRUCTION
Materials used in the construction of frames, blades. shafts, and linkages shall conform to requirements of specifications for materials given in Table AA-3100.
Allowable stress values for the design of frames, blades, shafts, and linkages are specified in Article
AA-4000.
At temperatures above 650F 343C) for ferrous material or 200°F (93°C) for nonferrous material, the special limitations cited in DA.321 I shall apply.
Bearing materials shall conform to the requirements of DA-4250.
DA-3140 SEAL MATERIALS
Seal materials shall conform to the requirements of DA-42).
flA-3200 SPECIAL LIMITATIONS ON
NIATERIAIS
I)A.321 1 Physical Properties Reduction
The reduction in the physical properties of metals at higher temperatures must be recognized and factored into the design of dampers used in high temperature application, particularly where lire hazard is involved.
PA.3212 Galvanic Corrosion
The possibility of galvanic corrosion due to the relative potentials of aluminum. copper, and their alloys should be considered when used in conjunction witheach other,or with steel or other metals and theiralloys.
DA-3213Corrosive Vapors
Aluminum and zinc shall not be used in the presenceof corrosive vapors unless protected by coatings orother suitable means designed to prevent deteriorationof the metal.
DA-3220NONMETALLIC MATERIALS
The use of nonmetallic materials such as plastics,elastomers，and similar substances is permitted in theconstruction of components provided that in the selec-tion of these materials，consideration is given to(a) destruction where fire hazards exist，includingtoxicity
(b) degradation of properties caused by temperatureincrease,radiation exposure，chemical exposure，andaging
(c) maintainability
DA-3230 DETERIORATION OF MATERIALS
IN SERVICE
lt is the responsibility of the Owner or his designeeto identify the environment in which the componentsmust operate so that the Manufacturer can select thegrade of materials to meet the conditions stated in thedesign specification.
DA-3300 CERTIFICATION OF
MATERIALS
The Manufacturer shall make available，as a mini-mum,certified test reports of chemical and physicalproperties of material and hardware for stress compo-nents such as related accessories including frames,
For components of ductwork and ductwork supports,the supplier shall make available,as a minimum, certi-fied test reports of chemical and physical properties.For those ASTM materials that do not have physicaltesting required by the ASTM specification,tensiletesting shall be performed per ASTM A 370.
All other components used in the construction ofductwork shall be provided with a manufacturer’s Cer-tificate of Compliance covering the ASME,ASTM,or other material specification,grade，and class，ifapplicable.
sA-3200 MATERIAL SUBSTITUTIONMeasures shall be established for controlling andidentifying material substitutions throughout the manu-facturing and installation process.
SA-3300 MATERIAL TESTING
When required by the design specification，materialshall be tested in accordance with the applicable material specification. Supplemental material testing, when re-quired，shall be performed in accordance with ArticleAA-3000.
SA-3400 MATERIAL SPECIFICATIONS
Material for ductwork and ductwork supports shallbe capable of meeting all requirements of Article SA-
4000. Materials shall be in conformance with the ASTMmaterials listed in Table AA-3100.Substitute materialsshall be equivalent, or exceed the requirements of TableAA-3100,as determined by the Engineer. Materialsselected shall be evaluated for suitability with serviceconditions and compatibility with other materials used
in duct construction.
The ASTM numbers in Table AA-3100 designate achemical composition and a material thickness limit.
Agrade designation is usually required to determinethe minimum strength of the material. If the specific grade material has an assigned minimum yield andtensile strength,these values shall be used for design purposes. If values have not been established andassigned,then tests in accordance with the procedures outlined in Article AA-3000 shall be nerformau toensure that the strengthof the material meets the required design stress values.