Attached files

file filename
EXCEL - IDEA: XBRL DOCUMENT - MPLX LPFinancial_Report.xls
10-Q - 10-Q - MPLX LPd431387d10q.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR2.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR8.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR7.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR9.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR1.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR6.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR3.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR4.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR5.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR25.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR31.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR28.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR19.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR33.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR48.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR16.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR43.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR32.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR35.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR37.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR18.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR44.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR22.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR29.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR24.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR12.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR47.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR40.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR46.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR45.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR17.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR42.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR41.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR27.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR26.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR11.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR15.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR21.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR30.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR13.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR23.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR36.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR38.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR39.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR20.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR34.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR14.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR10.htm
EX-32.2 - EX-32.2 - MPLX LPd431387dex322.htm
EX-32.1 - EX-32.1 - MPLX LPd431387dex321.htm
EX-31.1 - EX-31.1 - MPLX LPd431387dex311.htm

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Donald C. Templin, certify that:

 

  1. I have reviewed this report on Form 10-Q of MPLX LP;

 

  2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

 

  3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

 

  4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

 

  (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

 

  (b) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

 

  (c) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

 

  5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

 

  (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

 

  (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

 

Date: December 6, 2012      

/s/ Donald C. Templin

     

Donald C. Templin

     

Director, Vice President and Chief Financial Officer of

     

MPLX GP LLC

     

(the general partner of MPLX LP)