Research Article

Speed Simulation of Pig Restarting from Stoppage in Gas Pipeline

Figure 6

Distributions of gas parameters. (a), (b), and (c) are gas density, pressure, and velocity during the time the pig was unstuck by increasing upstream pressure, respectively; (d), (e), and (f) are gas density, pressure, and velocity during the time the pig was unstuck by decreasing downstream pressure, respectively; (g), (h), and (i) are gas density, pressure, and velocity during the time the pig was unstuck by inlet pressurization together with outlet relief, respectively.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)