Fitness-For-Service

[matrix2011]

HI

would you please to help me for assessing line exposed to water hammer, the pipe dia. is 36 inch ,sch.40 and transporting condensates from storage tank to jetty ,also the line is insulated as solar protection the pump has stopped suddenly ,all the pipes shoes had moved over the sleepers-20cm per each pipe- and the line is resting directly on the sleepers, one leg of horizontal expansion loop had moved also for 20 cm distance in the perpendicular direction for the loop leg, no anchoring had been applied through original design ,the Reference Code is ASME B.31.3,the length of each pipe is 12m

 

[metengr]

Since you appeared to have surveyed the displaced line, I would perform a targeted inspection by selecting locations which would have been exposed to maximum bending stresses and locally strip insulation to expose girth welds for surface NDT.
Next, I would discuss the NDT results and current pipe location with an experienced piping design engineer to evaluate options.

 

[TGS4]

Focus your assessment on the various failure modes, and, like metengr says, target your inspection to identify aspects of the failure modes.

Think about what happened and what could have been weakened in the water hammer event. Then, evaluate the pipe line in it's existing condition, assessing all of the potential failure modes that the Code requires assessment of.