Enter the yield strength (psi), the design factor, temperature factor, thickness (in), diameter (in), and the joint factor into the calculator to determine the Maximum Allowable Work Pressure.

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## Maximum Allowable Work Pressure Formula

The following formula is used to calculate the Maximum Allowable Work Pressure.

**MWAP = 2*Y*Fd*Fj*Ft*t/d**

- Where MWAP is the Maximum Allowable Work Pressure (psi)
- Y is the yield strength (psi)
- Fd is the design factor
- Fj is the joint factor
- Ft is the temperature factor
- t is the thickness (in)
- d is the diameter (in)

## How to Calculate Maximum Allowable Work Pressure?

The following example problems outline how to calculate the Maximum Allowable Work Pressure.

**Example Problem #1**

- First, determine the yield strength (psi). In this example, the yield strength (psi) is given as 10000 .
- Next, determine the design factor. For this problem, the design factor is given as .5.
- Next, determine the joint factor. In this case, the joint factor is found to be .6.
- The temperature factor. This is .75.
- Next, determine the thickness and diameter. These are given as 1.5 inches and 3 inches respectively.
- Finally, calculate the Maximum Allowable Work Pressure using the formula above:

MWAP = 2*Y*Fd*Fj*Ft*t/d

Inserting the values from above and solving yields:

MWAP = 2*10000*.5*.75*.6*1.5/3 = 2250 (psi)

**Example Problem #2**

Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:

yield strength (psi) = 5000

design factor = .6

joint factor = .5

temperature factor = 1.2

thickness = 4.5

diameter = 5

Enter these given values yields:

MWAP = 2*5000*.6*.5*1.2*4.5/5 = 3240** **(psi)