DIMENSIONAMIENTO DE LOOPS US ARMY

Metric Units

English Units

Metric Units

English Units

Donde:

L = Loop length, mm (ft)

X = Parallel leg of loop, mm (ft)

Y = 2X = Tangential leg of loop, mm (ft)

D = Actual outside pipe diameter, mm (ft)

E = Modulus of elasticity at the working temperature, kPa (psi)

Sa =

Δ = Change in length due to temperature change, mm (in.)

C1= Constant, 0.3333

Datos:

D = 3.5 [in] Diametro exterior de la tuberia

l = 787 [in] Distancia entre frenos

α = 6.25E-06 Coeficiente de expansion termica @ Temp Ope

Top = 150 Temperatura de Operacion

Tamb = 59 Temperatura Ambiente

Ecuacion para calcular la expansion termica:

Δ = l x α x ΔT

Δ = 0.45 [in]

L = 7.79 [ft]

L = X + 2Y ec.1

Y = 2X ec. 2 `

L = 5X ec. 2 en ec. 1

X = 1.56 [ft] ≈ 18.70 [in]

Y = 3.12 [ft] ≈ 37.40 [in]

L = X + 2Y = (ΔDE/C1*Sa)0.5

L = X + 2Y = (3ΔDE/144 in² / ft²)Sa)0.5

L = 74.7 (ΔD)0.5

L = 6.225(ΔD)0.5

Maximum allowable stress at the workingtemperature, kPa (psi)

[in/in oF]

[oF]

[oF]

L = 6.225 (Δ*D)0.5