HYDRAULIC FLUID LINE BURST PRESSURES
(Barlow’s Formula)
P = (2ST÷D) (45,000 PSI Min Tensile)
P = Burst Pressure
S = 45,000 lbs. PSI Tensile Strength
T = Nominal Wall Thickness
D = Outside Diameter
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1/4″ x 0.035 – 12,600
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5/8″ x 0.083 – 11,950
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1-1/8″ x 0.065 – 5,200
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1/4 x 0.049 – 17,640
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3/4 x 0.035 – 4,200
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1-1/8″ x 0.083 – 6,640
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5/16″ x 0.035 – 10,080
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3/4″ x 0.049 – 5,880
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1-1/8 x 0.95 – 7,600
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5/16 x 0.049 – 14,110
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3/4 x 0.065 – 7,800
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1-1/8 x 0.109 – 8,720
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3/8″ x 0.035 – 8,400
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3/4″ x 0.083 – 9,960
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1-1/4″ x 0.065 – 4,680
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3/8 x 0.049 – 11,760
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3/4 x 0.095 – 11,400
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1-1/4 x 0.083 – 5,975
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3/8″ x 0.065 – 15,600
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3/4″ x 0.109 – 13,080
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1-1/4 x 0.095 – 6,840
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7/16 x 0.035 – 7,200
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7/8 x 0.049 – 5,040
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1-1/4″ x 0.109 – 7,848
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7/16″ x 0.049 – 10,080
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7/8″ x 0.065 – 6,685
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1-1/4 x 0.120 – 8,640
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7/16 x 0.065 – 13,370
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7/8 x 0.083 – 8,535
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1-1/2″ x 0.083 – 4,980
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1/2″ x 0.035 – 6,300
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7/8″ x 0.095 – 9,770
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1-1/2 x 0.095 – 5,700
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1/2 x 0.049 – 8,820
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1″ x 0.049 – 4,410
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1-1/2″ x 0.109 – 6,540
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1/2″ x 0.065 – 11,700
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1″ x 0.065 – 5,850
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1-1/2 x 0.120 – 7,200
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5/8 x 0.035 – 5,040
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1″ x 0.083 – 7,470
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2″ x 0.134 – 6,030
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5/8″ x 0.049 – 7,055
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1″ x 0.095 – 8,550
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2″ x 0.188 – 8,460
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5/8 x 0.065 – 9,360
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Note: To compute safe working pressures, above Burst Pressures should be divided by your desired safety factor.