Torque 1999
Páginas: 7 (1524 palabras)
Publicado: 11 de febrero de 2013
1. Purpose
It is the intention of Ingersoll-Rand Large Recip Business Unit to maintain proper fastener torque specifications in order to ensure full mechanical integrity, assembly precision and product quality.
2. Scope
This instruction applies to SAE Grade and Metric Class fasteners, Thread Rolling (Taptite) screws, and Multi-Fastener components requiring asequentially tightening fastener instruction used for compressor assembly. This instruction does not apply if specific engineering torque specifications are documented on assembly bills of material or related instructions.
3. References
3.1 Applicable Reference Material
3.1.1 IFI 5th Edition Technical Data Book.
3.1.2 Bossard InternationalFasteners Handbook Technical Information Table 9.9.
3.1.3 This work instruction supersedes the Manufacturing Engineering Procedure 35-3.01 Rev. 3.
4. Instructions
4.1 Fastener preload (initial tightening) method for fasteners based upon thread type, shank size, fastener type and grade.
4.1.1 Note that all fasteners are torqued but all arenot required to be measured. Measured/Torque requirements are as follows: pressure vessels (ie. tanks and plumbing), rotating parts (ie. fans and sheaves), critical parts.
4.1.2 Identify the type of fastener: SAE, Metric, Thread Rolling or Set Screw.
4.1.3 Identify whether the fastener is plain or plated.
4.1.4 Identify the fastener size. Thefastener size can either be found on the bill of material or manually measured. Manually measure the bolt shank size and determine if the threads are fine or coarse. (A common mistake is to measure the bolt head size rather than its shank.)
4.1.5 Refer to the tables below and obtain the proper torque requirement.
4.1.5.1 Page 8 & 9 are specific to areasof Reciprocating Compressors.
4.1.6 Adjust a hand torque wrench to the desired torque or alternately use a preset hand or pneumatic torque wrench to tighten the fastener.
4.2 Sequential tightening of Multi-Fastener components.
4.3 ll fasteners used on multi-fastener joints require a procedure that will allow even and sequential tightening to the specifiedtorque. This is essential in preventing distortion of mating surfaces and "cocking" of flanged connections.
4.3.1 Hand tighten or lightly seat all fasteners of the component in a sequence as depicted in typical geometrical diagrams in the figures shown below.
4.3.2 Using a properly set torque, repeat tightening the fasteners following the same establishedpattern until the final torque is achieved.
TORQUE TABLE 1 COARSE THREAD
SAE GRADE 5/METRIC CLASS 8.8
|SIZE |PLAIN |PLATED |
| |+/- 10% |+/- 10% |
|1/4-20UNC |8ftlbs|96inlbs |6ftlbs|72inlbs |
|5/16-18 UNC |17ftlbs|204inlbs |13ftlbs|156inlbs |
|3/8-16 UNC |30 ftlbs |25 ftlbs |
|7/16-14 UNC|50 ftlbs |40 ftlbs |
|1/2-13 UNC |75 ftlbs |55 ftlbs |
|9/16-12 UNC |110 ftlbs |80 ftlbs |
|5/8-11 UNC...
It is the intention of Ingersoll-Rand Large Recip Business Unit to maintain proper fastener torque specifications in order to ensure full mechanical integrity, assembly precision and product quality.
2. Scope
This instruction applies to SAE Grade and Metric Class fasteners, Thread Rolling (Taptite) screws, and Multi-Fastener components requiring asequentially tightening fastener instruction used for compressor assembly. This instruction does not apply if specific engineering torque specifications are documented on assembly bills of material or related instructions.
3. References
3.1 Applicable Reference Material
3.1.1 IFI 5th Edition Technical Data Book.
3.1.2 Bossard InternationalFasteners Handbook Technical Information Table 9.9.
3.1.3 This work instruction supersedes the Manufacturing Engineering Procedure 35-3.01 Rev. 3.
4. Instructions
4.1 Fastener preload (initial tightening) method for fasteners based upon thread type, shank size, fastener type and grade.
4.1.1 Note that all fasteners are torqued but all arenot required to be measured. Measured/Torque requirements are as follows: pressure vessels (ie. tanks and plumbing), rotating parts (ie. fans and sheaves), critical parts.
4.1.2 Identify the type of fastener: SAE, Metric, Thread Rolling or Set Screw.
4.1.3 Identify whether the fastener is plain or plated.
4.1.4 Identify the fastener size. Thefastener size can either be found on the bill of material or manually measured. Manually measure the bolt shank size and determine if the threads are fine or coarse. (A common mistake is to measure the bolt head size rather than its shank.)
4.1.5 Refer to the tables below and obtain the proper torque requirement.
4.1.5.1 Page 8 & 9 are specific to areasof Reciprocating Compressors.
4.1.6 Adjust a hand torque wrench to the desired torque or alternately use a preset hand or pneumatic torque wrench to tighten the fastener.
4.2 Sequential tightening of Multi-Fastener components.
4.3 ll fasteners used on multi-fastener joints require a procedure that will allow even and sequential tightening to the specifiedtorque. This is essential in preventing distortion of mating surfaces and "cocking" of flanged connections.
4.3.1 Hand tighten or lightly seat all fasteners of the component in a sequence as depicted in typical geometrical diagrams in the figures shown below.
4.3.2 Using a properly set torque, repeat tightening the fasteners following the same establishedpattern until the final torque is achieved.
TORQUE TABLE 1 COARSE THREAD
SAE GRADE 5/METRIC CLASS 8.8
|SIZE |PLAIN |PLATED |
| |+/- 10% |+/- 10% |
|1/4-20UNC |8ftlbs|96inlbs |6ftlbs|72inlbs |
|5/16-18 UNC |17ftlbs|204inlbs |13ftlbs|156inlbs |
|3/8-16 UNC |30 ftlbs |25 ftlbs |
|7/16-14 UNC|50 ftlbs |40 ftlbs |
|1/2-13 UNC |75 ftlbs |55 ftlbs |
|9/16-12 UNC |110 ftlbs |80 ftlbs |
|5/8-11 UNC...
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