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q explain about napthenic acid corrosionsome crude oils contain napthenic acids which at elevated temperatures may contribute to more active
q what do you understand by carburizationcarburization is initiated by the adsorption of carbon in contact with the surface of the metal and may
q explain sulphidation processthe presence of sulphur converts the surface of the metal to a sulphide scale which is generally more destructive than
q define oxidation processoxidation is defined as a loss of electrons as when a metal goes from the metallic state to the corroded state when a
q environmental factors for high temperature service materialsmany environmental factors must also be considered when choosing a material for high
q overall deformation of a componentthe overall deformation of a component is a function of the applied load the materials creep rate the maximum
q expected service life of a component in high temperature environmentthe expected service life of a component in a high temperature environment is
q mechanical properties of high temperature strength of metalsthe high temperature strength of metals is related to their melting points but many
q factors in the design of high temperature materialsthere is typically little correlation between room temperature strength and high temperature
q selection of metallic materialsthis engineering practice has been written to assist those involved in the construction of new equipment and for the
q shipping of steel pipespipe will be transported from the coating yard to the job site as specified in the purchaser order the applicator will
q stacking in the applicators storagestacking in the applicators storage yard shall be in accordance with good safety practices andor owner
q patching touch up stickpipe requiring limited coating repair resulting from scars slivers holidays etc shall be repaired by an owner approved
q explain coating repairsany coatings found to be damaged or that do not pass the inspection stage shall be recoated or repaired at the expense of
q production test ringsthe frequency for the tests shall be as followsbullone sample at the 10th jointbullone sample at the 75th jointbullone sample
q identification of defects of coatingall holidays and other coating defects including without limitation primer blister excess powder mounds crazed
q what is holiday detectioneach length of coated pipe shall be checked for holidays with a high quality heavy duty full wave rectified non pulsating
q what is coating thicknessthe dry thickness of the coating shall be checked by using a micro test magnetic gauge or approved equal which has been
q inspection and testing for coating applicationthe applicator shall perform all inspection and testing necessary to assure that the surface
q show the coating applicationimmediately following surface preparation the cleaned pipe shall be uniformly preheated by a non-contaminating method
q explain about surface preparationall oil grease salts and any other contaminants detrimental to the formation of a good coating bond or coating
q limitations of fusion bond epoxy coatingsthe application of fusion bond epoxy coatings shall be limited to specially equipped coating yards or
q storage and handling of epoxy powdercoating materials shall be stored handled and applied in strict accordance with procedures as outlined by the
q what is epoxy powderthe coating manufacturer shall be consulted as to the product best suited to the applicators speed of coating pipe diameter and
q what is fusion bondingfusion bonding shall refer to the fusion bond coating process which utilizes heat to melt adhere the coating material to the