Description
DFI-150-0003 BOLTED ASSEMBLY PERFORMANCE CLASS A screwed assembly is designated by a performance class (CP) defined by the engineering office, determined according to the constraints related to tightening precision required by dimensioning, accessibility of the assembly and during the maintenance. The 5 performance classes used within ALSTOM define the maximum precision required for the use of a tension or torque applied to an assembly by considering tool precision as well as human factor: • +/-20 % precision tools are not appropriate for a CPC20 performance class. • Capability (as per DTRF 150214) allows verifying the adequacy of means (sensibility) considering the human factor towards the specified performance class. • CPC20 torque values considered as a preferred solutions for all designs
DFI-150-0003 ASSEMBLY DESCRIPTION • Indicate the DTR code of the fixation element in the bill of material • Prescribe salt spray level, in hours, if different from standards DTRF 150213 • Use the logos of the DTRF 150250 to specify: • Tightening torque value and performance class • Safety level (/H / M / L) • Safety logo • Geometrical tolerances on interfaces (hole, flatness, roughness) • Additional protection on fastener (wax, peripherical sealing)
DFI-150-0003 ADDITIONAL INFORMATION
• Retightening operation with parameter defined with the site assembly expert (ENG/IND): duration + retightening torque (if different from initial torque value): Example Re-tightening following DTRF 150214 – 250N.m CPC20 after 24 hours
• When using grease prescribe grease with Molybdenum (do not prescribe oil or anticorrosive grease)
• Indicate if it is necessary to use thread lock and the type
• Authorization of the tightening head side: only in the case of a screwed assembly, in case of difficult access, specify the possibility of tight head side (by default the DTRF 150214 specifies the tightening nut side)
• Authorization to not mark the elements (blue, orange or green) according to the limits of the DTRF 150214: contact with effluent, difficulty of access
• List of screw whose Tr level is > 70*% of F0minstab (this list is used for the control plan defined into DTRF150214)
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
Company advantage: Supply imported original products, professional production of spare parts
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