Maximum Bolt Spacing Calculator

✖Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part.ⓘ Nominal Bolt Diameter [d_b]			+10% -10%
✖Thickness of Flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength or for stabilizing and guiding the movements of a machine or its parts.ⓘ Thickness of Flange [t_f]			+10% -10%
✖Gasket Factor the 'm' value, referred to as the maintenance factor, is the compressive load required on the gasket to maintain the seal once pressurised.ⓘ Gasket Factor [m]			+10% -10%

✖Maximum Bolt Spacing for holes is 24 times the thickness of the thinner part (but not more than 12 in.).ⓘ Maximum Bolt Spacing [b_s(max)]

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Formula

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Maximum Bolt Spacing

Formula

`"b"_{"s(max)"} = 2*"d"_{"b"}+(6*"t"_{"f"}/"m"+0.5)`

Example

`"303.5m"=2*"1.5m"+(6*"100m"/"2"+0.5)`

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Maximum Bolt Spacing Solution

STEP 0: Pre-Calculation Summary

Formula Used

Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5)
b_s(max) = 2*d_b+(6*t_f/m+0.5)
This formula uses 4 Variables

Variables Used

Maximum Bolt Spacing - (Measured in Meter) - Maximum Bolt Spacing for holes is 24 times the thickness of the thinner part (but not more than 12 in.).
Nominal Bolt Diameter - (Measured in Meter) - Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part.
Thickness of Flange - (Measured in Meter) - Thickness of Flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength or for stabilizing and guiding the movements of a machine or its parts.
Gasket Factor - Gasket Factor the 'm' value, referred to as the maintenance factor, is the compressive load required on the gasket to maintain the seal once pressurised.

STEP 1: Convert Input(s) to Base Unit

Nominal Bolt Diameter: 1.5 Meter --> 1.5 Meter No Conversion Required
Thickness of Flange: 100 Meter --> 100 Meter No Conversion Required
Gasket Factor: 2 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

b_s(max) = 2*d_b+(6*t_f/m+0.5) --> 2*1.5+(6*100/2+0.5)

Evaluating ... ...

b_s(max) = 303.5

STEP 3: Convert Result to Output's Unit

303.5 Meter --> No Conversion Required

FINAL ANSWER

303.5 Meter <-- Maximum Bolt Spacing

(Calculation completed in 00.004 seconds)

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< 17 Design of Pressure Vessel Subjected to Internal Pressure Calculators

Coefficient Value for Thickness of Flange

Go Coefficient Value for Thickness of Flange = ((1)/((0.3)+(1.5*Maximum Bolt Loads*Radial Distance)/(Hydrostatic End Force in Gasket Seal*Diameter of Gasket at Load Reaction)))

Gasket Factor

Go Gasket Factor = (Total Fastener Force-Inside Area of Gasket*Test Pressure)/(Gasket Area*Test Pressure)

Longitudinal Stress (Axial Stress) in Cylindrical Shell

Go Longitudinal Stress for Cylindrical Shell = (Internal Pressure given Longitudinal Stress*Mean Diameter of Shell)/4*Thickness of Cylindrical Shell

Internal Presure of Vessel given Longitudinal Stress

Go Internal Pressure given Longitudinal Stress = (4*Longitudinal Stress*Thickness of Cylindrical Shell)/(Mean Diameter of Shell)

Wall Thickness of Pressure Vessel given Longitudinal Stress

Go Thickness of Shell for Longitudinal Stress = (Internal Pressure for Vessel*Mean Diameter of Shell)/(4*Longitudinal Stress)

Wall Thickness of Cylindrical Shell Given Hoop Stress

Go Thickness of Shell for Hoop Stress = (2*Internal Pressure given Hoop Stress*Mean Diameter of Shell)/Circumferential Stress

Internal Pressure of Cylindrical Vessel given Hoop Stress

Go Internal Pressure given Hoop Stress = (2*Circumferential Stress*Thickness of Cylindrical Shell)/(Mean Diameter of Shell)

Circumferential Stress (Hoop Stress) in Cylinderical Shell

Go Circumferential Stress = (Internal Pressure for Vessel*Mean Diameter of Shell)/2*Thickness of Cylindrical Shell

Maximum Bolt Spacing

Go Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5)

Hydrostatic End Force using Design Pressure

Go Hydrostatic End Force = (pi/4)*(Radial Distance^2)*Internal Pressure

Diameter of Gasket at Load Reaction

Go Diameter of Gasket at Load Reaction = Outside Diameter of Gasket-2*Effective Gasket Seating Width

Effective Thickness of Conical Head

Go Effective Thickness = Thickness of Conical Head*(cos(Apex Angle))

Hoop Strain

Go Hoop Strain = (Final Length-Initial Length)/(Initial Length)

Radial Distance from Gasket Load Reaction to Bolt Circle

Go Radial Distance = (Bolt Circle Diameter-Diameter of Gasket at Load Reaction)/2

Bolt Circle Diameter

Go Bolt Circle Diameter = Outside Diameter of Gasket+(2*Nominal Bolt Diameter)+12

Outside Diameter of Flange using Bolt Diameter

Go Outside Flange Diameter = Bolt Circle Diameter+2*Nominal Bolt Diameter+12

Minimum Bolt Spacing

Go Minimum Bolt Spacing = 2.5*Nominal Bolt Diameter

Maximum Bolt Spacing Formula

Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5)
b_s(max) = 2*d_b+(6*t_f/m+0.5)

What is Bolt?

A Bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut.

How to Calculate Maximum Bolt Spacing?

Maximum Bolt Spacing calculator uses Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5) to calculate the Maximum Bolt Spacing, Maximum Bolt Spacing is maximum pitch (distance between centres of bolt holes) which is 24 times the thickness of the thinner part, calculated using thickness of the flange is to gasket factor. Maximum Bolt Spacing is denoted by b_s(max) symbol.

How to calculate Maximum Bolt Spacing using this online calculator? To use this online calculator for Maximum Bolt Spacing, enter Nominal Bolt Diameter (d_b), Thickness of Flange (t_f) & Gasket Factor (m) and hit the calculate button. Here is how the Maximum Bolt Spacing calculation can be explained with given input values -> 303.5 = 2*1.5+(6*100/2+0.5).

FAQ

What is Maximum Bolt Spacing?

Maximum Bolt Spacing is maximum pitch (distance between centres of bolt holes) which is 24 times the thickness of the thinner part, calculated using thickness of the flange is to gasket factor and is represented as b_s(max) = 2*d_b+(6*t_f/m+0.5) or Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5). Nominal Bolt Diameter is the diameter equal to the external diameter of the threads or the overall diameter of the part, Thickness of Flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength or for stabilizing and guiding the movements of a machine or its parts & Gasket Factor the 'm' value, referred to as the maintenance factor, is the compressive load required on the gasket to maintain the seal once pressurised.

How to calculate Maximum Bolt Spacing?

Maximum Bolt Spacing is maximum pitch (distance between centres of bolt holes) which is 24 times the thickness of the thinner part, calculated using thickness of the flange is to gasket factor is calculated using Maximum Bolt Spacing = 2*Nominal Bolt Diameter+(6*Thickness of Flange/Gasket Factor+0.5). To calculate Maximum Bolt Spacing, you need Nominal Bolt Diameter (d_b), Thickness of Flange (t_f) & Gasket Factor (m). With our tool, you need to enter the respective value for Nominal Bolt Diameter, Thickness of Flange & Gasket Factor and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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