i check API 610 pump ,but i dont understand about some formula in equipment report .Show me some ,plz
Check of Condi t ion F . 1 . 2 . b
(FRSa/1.5FRSt4) + (MRSa/1.5MRSt4) <= Force & Moment ratios
(FRDa/1.5FRDt4) + (MRDa/1.5MRDt4) <= Force & Moment ratios
Check of Condi t ion F.1.2.c
1.5 ( FRSt4 + FRDt4 ) <= Force & Moment ratios
2.0 ( MYSt4 + MYDt4 ) <= Force & Moment ratios
1.5 ( MRSt4 + MRDt4 )<= Force & Moment ratios

Could you please elaborate on what you mean when you say "i dont understand about some formula in equipment report".Which equipment report are you referring to ? The conditions you have mentioned above are in Appendix F of API 610 and these terms are defined in the paragraphs just before them.