Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  FIRST RESERVE GP X INC
 2. Date of Event Requiring Statement (Month/Day/Year)
03/21/2005		 3. Issuer Name and Ticker or Trading Symbol
PACIFIC ENERGY PARTNERS LP [PPX]
(Last)
(First)
(Middle)
ONE LAFAYETTE PLACE, THIRD FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See Remark (1), below
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

GREENWICH, CT 06830		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Subordinated Units Representing Limited Partner Interests   (1)   (2) Common Units Representing Limited Partner Interests 785,916.25 $ (3) I (4) See FN (4)
Subordinated Units Representing Limited Partner Interests   (5)   (2) Common Units Representing Limited Partner Interests 785,916.25 $ (3) I (4) See FN (4)
Subordinated Units Representing Limited Partner Interests   (6)   (2) Common Units Representing Limited Partner Interests 1,571,832.5 $ (3) I (4) See FN (4)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
FIRST RESERVE GP X INC
ONE LAFAYETTE PLACE
THIRD FLOOR
GREENWICH, CT 06830		       See Remark (1), below
FIRST RESERVE GP X LP
ONE LAFAYETTE PLACE
THIRD FLOOR
GREENWICH, CT 06830		       See Remark (1)
First Reserve Pacific Holdings AIV, L.P.
ONE LAFAYETTE PLACE
THIRD FLOOR
GREENWICH, CT 06830		       See Remark (1)

Signatures

Thomas R Denison, Managing Director of First Reserve GP X, Inc., is signing on its behalf as the designated filer, and on behalf of the FRC Entities as defined in Remark (1). 03/31/2005
**Signature of Reporting Person Date
Thomas R. Denison 03/31/2005
**Signature of Reporting Person Date
Thomas R. Denison 03/31/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Subordinated Units are convertible into Common Units of the Issuer immediately after the distribution of available cash to partners in respect of any quarter ending on or after June 30, 2005, assuming certain financial tests in the Issuer?s partnership agreement have been satisfied.
(2) None.
(3) 1-for-1
(4) The transaction reported is the contemporaneous indirect acquisition of the Subordinated Units by virtue of Holdings LP?s (1) acquisition of 30 percent of the outstanding limited partner interests of LB LP and (2) acquisition of 30 percent of the outstanding membership interests of LB LLC. LB LP directly owns 10,465,000 Subordinated Units.
(5) The Subordinated Units are convertible into Common Units of the Issuer immediately after the distribution of available cash to partners in respect of any quarter ending on or after June 30, 2006, assuming certain financial tests in the Issuer?s partnership agreement have been satisfied.
(6) The Subordinated Units are convertible into Common Units of the Issuer immediately after the distribution of available cash to partners in respect of any quarter ending on or after June 30, 2007, assuming certain financial tests in the Issuer?s partnership agreement have been satisfied.
 
Remarks:
(1) First Reserve GP X, Inc. ("First Reserve") is the general partner of First Reserve GP X, L.P. ("GP X").  GP X is the general partner of First Reserve Pacific Holdings AIV, L.P. ("Holdings LP").  Following the transaction that is the subject of this Form 3, Holdings LP directly owns a 30 percent limited partner interest in LB Pacific, LP ("LB LP") and a 30 percent membership interest in LB Pacific GP, LLC ("LB LLC").  
The Subordinated Units of the Issuer that are the subject of this Form 3 are directly owned by LB LP.   LB LLC is the sole general partner of LB LP.  LB LP is the sole limited partner of Pacific Energy GP, LP, which is the sole general partner of the Issuer.  LB LP is also the sole owner of Pacific Energy Management, LLC, which is the sole general partner of Pacific Energy GP, LP. 
GP X and Holdings LP are controlled by First Reserve.  GP X and Holdings LP are collectively referred to herein as the "FRC Entities." 
This Form 3 is reporting the contemporaneous indirect acquisition of the Subordinated Units by virtue of (1) the acquisition of the limited partner interests of LB LP by Holdings LP and (2) the acquisition of membership interests of LB LLC by Holdings LP.

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