Question

Prob 11 A 12" dia steel pipe carries stearn at 200 psi 2 = 36 lsi What wall thickness is required at FS = 1.8? b. Pipe sections are joined by bolts through flanges. Bolts are " dia (0.2 in2), au= 20 ksi How many bolts are required to resist the longitudinal force around the perimeter? c. How do you assure that the joint gaskets are in compression before pressurizing the pipe? What then happens in the bolts when the steam is fed into the pipe? d. Calculate Tax in the pipe wall, 45° to the centerline of the pipe le. How much will a 10' pipe lengthen for AT = +100°F. a=1.0 x 10-6/ A°F. If there are no expansion joints, does longitudinal stress increase or decrease? What type of failure can occur?

Answer 1

solution :- a) D: 12 inches P: 200 Psi Gau : 36 KSI N: 1.8 Ghoop . Pd 2t 200 X 12 < 34 N 36 X1000 2xt 18 *t ²0.06 inch Grong Pd 4t < 36 to 0.03 inch 0.06 inch 0) Grong x adt xadt o i for safety thickness: longitudinal force Pd px 7 d² 4% Flong = 226 19:46 Pound -force force resisted by each bolt = 20x103 4000 Pound-force no. of bolts required 6 botts . now 6.A x 0.2 i. -- 22 619.46 > 5.65 - 4000 C) This done done by Pre-stressing the holts. Now, as the steam froms it exerts pressure this both hoop & longitud tudnal stresses are Tensile henu the botts are in Terssion. ( 45 Pd R at Struns element ? 45 Pd at Tas at J Pd 1+

moni's inde for this element ! T Iman pd 9 at 45° from Imax ра. 8t pd 2t It Cenho line 2 حم o 6 Imax 62 - 62 pa -Pd at at 2 Imax . Pd 8+ Ali - 3 ? 10 e) as Temperature is increased, the length will also increase lf = lo Citat) loat 10 x 1x10-'x100 inch as temperature is increased both length a diameter is increased unters the pipe is restricted to expand stresses remain same but if the expansion is restricted → sherses durease and failure occurs at flange at flange & molts is delayed. I