For instance, if you have a 3ft long crack that is 4" deep, when you are done removing it, whether by grinding or gouging, what you are left with when you are done is basically a weld joint prep, whether it is CJP or PJP. The easy way to simulate is just to take a solid piece of plate, gouge out a groove just like there was a crack right down the middle, then weld it back up. If you end up going all the way though, it isn't much different than a normally prepared goove weld test except for the fact that you can't adjust the root opening. The qualification end of crack repair is really the easy part, the hard part is the metallurgy/physics of it all. Why did it crack in the first place? Is the steel brittle, or just overstressed? Did fatigue play a factor? If so, will the residual stresses of the weld cause a problem. Is it a corrosion crack? If so, what maximum hardness of the weld/HAZ is allowable, and how are you going to keep it that soft in the field so that the cracking won't be repeated. PWHT is a lot harder to do in the field if required, but it may depending on what caused the crack in the first place. Sometimes it is actually better to leave a non-growing crack that is calculated will not achieve critical flaw size than risk a repair. Has the steel been embrittled during service, such as H2S, or high temperature service, and how will that affect welding? Anyhow, simulating all of those conditions can be impossible as you can see.

As far as your crack repair WPS for galv, it would not need to be too much different than the original procedure used to weld the galvanized component, except you would want to make sure you specify inspection to make sure the whole crack was removed, and stipping away the zinc within a certain distance of the weld.