What do you mean, or what are you trying to do? Are you trying to be a pipe stress consultant that comes in and collects drawings/data to analyze existing systems or forensic analysis?
Most engineering consultants have the capability to do pipe stress analysis. At my firm we've had several jobs where a power plant or similar asked us to perform pipe stress analysis and provide recommendations/report of the findings.
We have reached out to specialty consultants for dynamic analysis or particularly complicated/sensitive systems, but it's not the norm for us. Down in Houston or the gulf area the market may be very different, I don't know.