0
Why does the Barlow formula use the outside diameter when the pressure relates to the inside diameter?
The Barlow formula is a simplification of Lame's formula for thin walled pipes/ cylinders. The book by AP Moser (Buried Pipe Design) gives the derivation and arrives at S = PD/2t where D is infact the average diameter. This makes sense if you consider that there is a stress profile across the pipe wall with highest stress at the inside edge. So the average stress occurs in the material at the centre (ie. Do - t). The above book has a couple of good sketches illustrating this. Outer diameter is however quoted in the Barlow equation in some contexts - for example in ASME 31.8. This is apparently a simplification (infact nominal outside diameter is used which is actually a bit smaller than the real outer diameter). If using the formula to calculate wall thickness the answer will be slightly conservative but then you will generally look up a standard wall thickness (eg. from the table in ANSI B36.10) so you will likely arrive at the same answer anyway.
What else can I help you with?
What mathematical formula relates pressure force and area?
Pressure =Force/Area
How do you calculate radius when the have no radius and no diameter?
You use the information that you do have, and a formula that relates it to theradius or diameter of the circle. As an example: The circumference is very helpfulif you know it.
What is pi as it relates to circumference and diameter of a circle?
pi = circumference / diameter
What is the relationship between the circumfrance and diameter in a formula?
The relationship between the circumference and diameter of a circle is expressed by the formula ( C = \pi d ), where ( C ) represents the circumference, ( d ) is the diameter, and ( \pi ) (approximately 3.14) is a constant that relates these two measurements. This means that the circumference is always a little more than three times the diameter of the circle. Additionally, the ratio of the circumference to the diameter is always equal to ( \pi ).
What is lo circumference?
The circumference is the distance around the edge of a circle, essentially its perimeter. It can be calculated using the formula ( C = 2\pi r ), where ( r ) is the radius of the circle, or ( C = \pi d ), where ( d ) is the diameter. The constant ( \pi ) (approximately 3.14159) relates the diameter of the circle to its circumference.
What mathematical formula relates pressure force and area?
Pressure =Force/Area
How do you calculate radius when the have no radius and no diameter?
You use the information that you do have, and a formula that relates it to theradius or diameter of the circle. As an example: The circumference is very helpfulif you know it.
How can I calculate altitude from pressure?
To calculate altitude from pressure, you can use the barometric formula, which relates pressure to altitude. This formula takes into account the atmospheric pressure at sea level, the pressure at the given altitude, and the temperature of the air. By plugging in these values, you can determine the altitude based on the pressure reading.
How do air pressure relates to earth?
What in the community relates to air pressure?
What is pi as it relates to circumference and diameter of a circle?
pi = circumference / diameter
What is the relationship between the circumfrance and diameter in a formula?
The relationship between the circumference and diameter of a circle is expressed by the formula ( C = \pi d ), where ( C ) represents the circumference, ( d ) is the diameter, and ( \pi ) (approximately 3.14) is a constant that relates these two measurements. This means that the circumference is always a little more than three times the diameter of the circle. Additionally, the ratio of the circumference to the diameter is always equal to ( \pi ).
How to find density with temperature and pressure?
To find density with temperature and pressure, you can use the ideal gas law equation: density (pressure)/(gas constant x temperature). This formula relates the density of a gas to its pressure and temperature.
Elevated water tank psi to feet formula?
The formula to convert water tank pressure (psi) to feet of head is: Feet = psi * 2.31. This formula is derived from the equation for hydrostatic pressure, which relates pressure to the height of a fluid column.
What quantity relates to pressure?
PSI
The special number that relates the diameter of a circle to its circumference is?
Pi (3.14159265358.....)
What equation relates pressure to force and area?
The equation that relates pressure, force, and area is: Pressure = Force / Area. This equation states that pressure is equal to the force applied per unit area.
What formula relates wavelength and period?
The formula that relates wavelength (λ) and period (T) for a wave is: λ = v * T, where v is the speed of the wave.
