Question

Ignoring friction, determine the force required, in lbf, by mechanical attachments, such as stops, to hold the piston in place.

Problem 3.021 As shown in the figure below, a cylinder fitted with a piston is filled with 400 lb of saturated liquid ammonia at 35°F. The piston weighs 1 ton and has a diameter of 2.5 ft. Patm = 1 atm Piston Weight = 1 ton D = 2.5 ft Ammonia Saturated liquid

Answer 1

Consider the following properties from saturated ammonia - Temperature table. At T = 35°F, P= P = 66.291 lbf/in.? Apply the force balance on the piston. PA-Wpiston – Pam A- Fstops = 0) Fstops = (P- Pam) A – W piston For =( 6291 İbr/in ? - tm x 14.596.ldfin:) A ( 25 x 12 in ) )+ (1 ton x 2008) a . 2.5 ft xa 1 ft - 1 ton x 2000 lbf) 1 ton Fstops = 66.291 lbf /in.? - 1 atm x- 14.696 lbf/in. 2 1 atm Fstops = (36470.4 lbf)–(2000 lbf) Fstops = 34470.4 lbf