Hydraulic pipework design guide
Suggested exercises and observations
Find the angle of rotation to give a specific or maximum torque in a long shaft bolt.
1. Select 'bolts ,studs, and flanges' from the fitting type dropdown list.
♦ Select the size of bolt you would use in your example worked projet.
♦ Select the material type for your bolt or stud.
♦ Adjust the 'initial free length' slidebar to show the free length of the shaft.
♦ Observe what angle of rotation is required from hand-tight, to reach the maximum stress yield point.
♦ Adjust the stress at yield value to show the angle required to achieve a specific torque.
Find the angle of rotation to give a specific or maximum torque in a long shaft bolt.
2. Select 'Port Adaptors, Pipe Fittings, or Hose Fittings' from the fitting type dropdown list.
♦ Select the size of fitting or adaptor you would use in your example worked projet.
♦ Select the material type for your fitting or adaptor.
♦ Study the assembly instructions for the size and type of fitting or adaptor selected.
♦ Often there may be different pre-assembly, assembly and re-assembly instructions.
♦ If pre-assembly etc. is required then check to see if there is a more modern version of the same fitting that does not require such difficult and therefore unreliable fitting procedures.
For more details on using app. see our fitting assembly guide section.
Experiment 1: Bolts should always be torqued to a higher stress level than they would see in during their working life.
Question 1: Should you always tighten bolts to their yield point as given by the fittings guide calculator?
Experiment 2: Early designs of fittings often require a different pre-assembly, assembly, and re-assembly technique.
Question 2: What is the general rule for how fittings should be tightened?
Experiment 3: Modern fittings typically include a positive, taper face seal, either with or without an elastomeric seal.
Question 3: What standard angle of rotation is required to tighten modern fittings?
Experiment 4: One of the potential problems with ferrule style compression fittings is that it's difficult to tell if, or how much they have been tightened.
Question 4: What is a sensible procedure to ensure systems are built correctly?