PIP Slotted Saddle Hole Length Calculation Change
Pressure Vessel, Saddles, Bolts, PIP VEFV1100 randy bogard Pressure Vessel, Saddles, Bolts, PIP VEFV1100 randy bogard

PIP Slotted Saddle Hole Length Calculation Change

Did you catch the PIP calculation change for the slotted saddle hole length? If not, be sure to update your spreadsheets! 

The length of the slotted saddle bolt hole should account for the thermal expansion of the shell at process temperature. Sheared bolts and bent saddles from undersized slotted bolt holes pose a major operational risk that is often overlooked. 

Notice that the latest revision to the Process Industry Practices (PIP) standard changed the multiplier from 2 to 2.5. This means that your standard slotted saddle bolt hole lengths may need to increase to stay within the PIP standard.

Please review PIP VEFV1100 for more information regarding the design of supports and attachments.

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Calculate Required Slotted Bolt Hole Length
Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Bolting, Saddles, PIP VEFV1100 randy bogard Pressure Vessel, Heat Exchanger, Risk Management, COMPRESS, Bolting, Saddles, PIP VEFV1100 randy bogard

Calculate Required Slotted Bolt Hole Length

Can your saddle bolt holes handle the effects of thermal expansion in your equipment?

Bent saddles and sheared bolts from undersized slotted bolt holes pose a major operational risk that is often overlooked. It is much easier to design for thermal expansion before fabrication than it is to try to fix an inadequate slotted bolt hole length while in service. There is a simple calculation to determine if your slotted bolt hole length is enough to handle thermal expansion at design temperature. 

Please review PIP VEFV1100 for more information regarding the design of supports and other attachments.

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