Ken,
If you are the end user, your concern should be that it is perfectly clear to the OEM what kind and quality of fuel you are using. There is only a handful of GT manufacturer's in our planet... and this is not the first time a naphta pump has been used. They have a lot of experience and usually the design is adequate per the specified codes.
In any case you surely have a warranty covering the supplied equipment.
In the past I've used API design pumps for naphta service with no particular requirements, except the ones for hydrocarbons.
But!!! Using these pumps as fuel pumps is not the same... here are the most usual errors in liquid fuel systems that
may break your heart:
1. Poor system flushing before first fire.
System cleanliness cannot be overemphasized.
2. Ensure that the filtration system is properly commissioned
3. Ensure that the liquid fuel tank is settled at least for 24hs (72 hs optimum)
4. Ensure that liquid fuel suction from tank is from the top and not the bottom (floating suction).
Also, eliminate all water from liquid fuel tanks!!!!
5. Depending on fuel quality, are centrifugues required?
6. Check the whole system from the tank to the liquid fuel nozzles and check for high points, each high point must have a vent. You WILL have a high point whenever: the piping goes upward and then downward...e.g. picture an inverted "U" - exception is made for tubing 1" or smaller.
#6 is the single most common cause of liquid fuel systems instability or failure to ignite.
I've lost count of how many times I've been called to a site that presented problems when burning liquid fuel that was fixed by adding vents all over the place and making sure there was no air in the system.
HTH
Saludos
a.