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Pumps | Bolting failure

Casing bolting on paper mill process pump

Problem

The customer was experiencing failures of casing cover bolts in service on average every 5-6 weeks. This created a lot of unnecessary downtime and led to rising maintenance and material costs. The root of the problem could be traced back to installation procedures, whereby the bolts on the casing cover were simply torque tightened.

Application

Large paper mill facilty in the US.

  • Sulzer process pump
  • Mixing process creating excessive forces in the pump, transferring to the casing cover bolts
Existing solution

¾" (M20) - 10UNC stainless steel bolts.

James Walker solution

Existing bolts were replaced with RotaBolt RB1 Touch, which accurately measures tension so that it can be correctly achieved, maintained and monitored and ensures that installation is not reliant on torque tightening. A quick and easy tactile check of the bolt load ensures that regular maintenance checks can be made during operation without incurring downtime of the process.

Results and benefits

Since the introduction of RotaBolt technology, the customer has eliminated the problem of bolts snapping during tightening. This is due to controlling tension during installation and using the RotaCap indicator to determine that the correct tension has been achieved, which ensures that the bolts do not suffer fatigue-fail as a result of vibration and transverse forces.

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Improved operational efficiency
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Zero occurrence of installation failure
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Reduced lifetime material costs
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Significant reduction in maintenance
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RotaBolt tension indicating fasteners accurately measure tension so that it can be correctly achieved, maintained and monitored.

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