Important Facts: Quiz on Deciding Length of a pipeline II 7 MCQs with Explanations

Pipeline Length Factors Quiz

1. What is the design pressure of a pipeline?

The design pressure of a pipeline is:

2. How does acceptable pressure drop influence pipeline length?

The acceptable pressure drop:

3. How does diameter influence pipeline length?

The diameter of the pipeline determines:

4. Why is temperature profile important in pipeline design?

The temperature profile of the pipeline:

5. Which equation is used for calculating liquid flow parameters?

The equation H/L = fLv^2/2D is used for calculating:

6. What is the Reynolds number equation for gas flow in fully turbulent conditions?

The Reynolds number equation for turbulent gas flow is:

7. Which equation is used in the Colebrook-White equation for friction factor?

The Colebrook-White equation for friction factor uses the equation:

Short Article

Factors that influence the length of a pipeline

Design pressure: The design pressure of a pipeline is the maximum pressure that the pipeline is designed to withstand. Higher design pressures require thicker pipe walls, which increases the cost of the pipeline.
Acceptable pressure drop: The acceptable pressure drop is the maximum amount of pressure that is allowed to drop over the length of the pipeline. Higher acceptable pressure drops allow for longer pipelines, but they also reduce the efficiency of the pipeline.
Diameter: The diameter of the pipeline determines how much fluid can flow through the pipeline. Larger diameter pipelines can transport more fluid, but they are also more expensive to construct.
Wall thickness: The wall thickness of the pipeline must be sufficient to withstand the design pressure and internal forces. Thicker pipe walls can withstand higher pressures, but they also increase the cost of the pipeline.
Temperature profile: The temperature profile of the pipeline describes how the temperature of the fluid changes along the length of the pipeline. Temperature changes can affect the pressure and flow of the fluid, so it is important to consider the temperature profile when designing a pipeline.

Equations used in calculating the basic flow parameters for gas and liquid pipelines

The following equations are used in calculating the basic flow parameters for gas and liquid pipelines:

Liquid flow

H/L = fLv^2/2D

where:

H/L is the head loss per unit length of pipeline
f is the friction factor
L is the length of the pipeline
v is the velocity of the fluid
D is the diameter of the pipeline

Gas flowrate equations (fully turbulent)

For laminar flow (Re<2100):

f = 64/Re

where:

Re is the Reynolds number
For turbulent flow (Re>4000):

Q = 432.7 * (T_k / P_n) * [(P^2 - P_y^2 - E) / (GLT_mZ_m)]^(0.5 * tau) * D_cos^7

where:

Q is the gas flowrate
T_k is the base temperature
P_n is the base pressure
P is the pressure
P_y is the yield pressure
E is the efficiency factor
G is the gas specific gravity
L is the length of the pipeline
T_m is the average temperature
Z_m is the average compressibility factor
tau is the friction factor exponent
D_cos is the inside diameter of the pipeline

Colebrook-White equation

f = -737.02 * (Re^-1.413 - 1.413/Re + 3.70)

where:

f is the friction factor
Re is the Reynolds number

Reynolds number

Re = pD * v / mu

where:

Re is the Reynolds number
p is the density of the fluid
D is the diameter of the pipeline
v is the velocity of the fluid
mu is the viscosity of the fluid

These equations can be used to calculate the flowrate, pressure drop, and other important parameters for gas and liquid pipelines.

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