Attached are two docs I got from Google; they are lucid and easy to understand and cover examples. Pile Groups (Literature).pdf, Pile_Foundation_Design.pdf
With Dynamic loading, the question is not about piles designing only, but in fact, you need to design a foundation system and satisfy vibration limits for the machine. I can share with you typical rule of thumbs for dynamic design of machine foundations. Keep me posted on this as this is my specialty in structures.
1) Your utilization for piles should not exceed 45 - 55 % of capacity under static loading. This is to ensure that soil remains fairly elastic and expected behavior is achieved.
2) Is the boiler centrifugal or reciprocating machine ? You can check ACI - 351 that talks about minimum ratios of foundation weights to machine operating and their CG Locations for both centrifugal and reciprocating machines.
3) Your center of resistance for pile group should be with in 6-7% of machine C.G.
4) What is the max vibration limit for the boiler on the foundation level and at the machine CG level ? You normally get this information from the vendor and you proportion your foundation to satisfy those limits.
5) I am interested in knowing that how would you do a dynamic analysis for the system ?
6) You need to have complete soil investigation report with SCPT test providing shear wave velocities in each soil layer.
7) Is the foundation system an elevated one or is at ground level ? It is important to know this as table top machine design needs more engineering input and caution ?
8) What is your acceptable Human Perception Limit for the system ?
9) Is the foundation system being shared by super structure too. Please provide foundation plan. I want to see what is around your boiler.
10) You response of foundation should be outside the operating range of the machine to avoid resonance. (V.Imp)
11) Please reply asap .
Thanks.