Re: inspection methodes for pipe line has been working over pressure On a rough calculation you have exceeded maximum allowable pressures on both pipe and flanges by a factor of 2.
You do not indicate how long the over pressurisation was for or what the current working pressure is. You also do not indicate temperature and fluid service and whether the pipe is aboveground or buried.
You need to consider a risk assessment looking at all these factors plus was this a one time deal or have you been cycling the piping system.
Consider likelihood and consequences of failure, impact on operations, environment etc.
First is a visual to look for visible signs of damage, leaking flanges, loose bolts, deformation, misalignment, stressed pipe supports etc. API RP 574 can be used for guidance.
If this first go around looks good then you may have mitigated your risk of an immediate release.
Then consider long term operation, how long, what pressure, fluid service, future pressure excursions.
If there remains a high concern then you may need to proceed to the approach suggested by Rich Roberts or it may be more cost eefective to schedule a replacement.