FMC 10-K 2012 FY Annual report

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

UNDER SECTION 906 OF THE SARBANES-OXLEY

ACT OF 2002, 18 U.S.C. 1350

I, John T. Gremp, Chairman and Chief Executive Officer of FMC Technologies, Inc. (the “Company”), do hereby certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(a) The Annual Report on Form 10-K of the Company for the year ended December 31, 2012, as filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 22, 2013

/S/    JOHN T. GREMP

John T. Gremp

Chairman and Chief Executive Officer

(Principal Executive Officer)