Engine 2014: General Subjects

Question 263 of 3,524

As shown in the illustration, a section of standard weight, seamless steel pipe, has an external diameter of 3.5 inches. When the pipe is bent into a 90° turn, the length of the outside edge of the curve "A-B" will exceed the length of the inside edge of the curve "C-D" by __________ .

USCG illustration GS-0108 for Engine 2014 General Subjects question 263 — Illustration GS-0108

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ma mannylittle5 · May 12, 2019

The rule of thumb in bending pipe is that the radius of the bend will equal the outside diameter of the pipe.

Use the formula:- Difference in lengths = Ï€ 2 x external diameter of pipe

Ï€ Ã·2 = 3.142 2 = 1.571

Internal diameter of pipe = 4.5â€ and wall thickness = 0.355â€

External diameter of pipe = 4.5 + 0.355 + 0.355 = 5.21 inches

Difference in lengths (A-B to C-D) = 1.571 x 5.21
Difference in lengths = 8.184 inches

Engine 2014: General Subjects

As shown in the illustration, a section of standard weight, seamless steel pipe, has an external diameter of 3.5 inches. When the pipe is bent into a 90° turn, the length of the outside edge of the curve "A-B" will exceed the length of the inside edge of the curve "C-D" by __________ .

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