Thanks Dave, but the F5.5.5 in API-11th Edition exists as F.1.2 under Annex F, as I mentioned in my previous message. It is on page 131 of 218. while para. 5.5.5 is actually 6.5.5 on page 31 which is page 39 of 218 in pdf document that I have.

In fact I did challenge the Contractor and he came back with the paragraphs I mentioned.

I used Forum to check if it is really allowed to use 4 times API individual loads since I found on the net this pdf link that says it is allowed:

http://calgarypumpsymposium.ca/uploads/P...resentation.pdf

So I thought maybe Contractor is correct and thus someone on forum faced a similar case and can help out.

Thanks again for your suggestion.