Document:

<PAGE>

                                                                  Exhibit 4(A)-2

               CERTIFICATE OF CONVERSION TO LIMITED PARTNERSHIP
                                      OF
                    TEXAS EASTERN TRANSMISSION CORPORATION
                                      TO
                        TEXAS EASTERN TRANSMISSION, LP

     This Certificate of Conversion to Limited Partnership, dated as of April
16, 2001, is being duly executed and filed by Texas Eastern Transmission
Corporation, a Delaware corporation (the "Corporation"), and Duke Energy Gas
Transmission Services, LLC, as general partner of Texas Eastern Transmission,
LP, a Delaware limited partnership (the "Limited Partnership"), to convert the
Corporation to the Limited Partnership, under the Delaware Revised Uniform
Limited Partnership Act (6 Del. C. (S) 17-101, et seq.) and the General
                           ------              ------
Corporation Law of the State of Delaware (8 Del. C. (S) 101, et seq.) (the
                                            ------           ------
"GCL").

     1.  The Corporation's name when it was originally incorporated was Texas
         Eastern Transmission Corporation. The Corporation's name immediately
         prior to the filing of this Certificate of Conversion to Limited
         Partnership was Texas Eastern Transmission Corporation.

     2.  The Corporation filed its original certificate of incorporation with
         the Secretary of State of the State of Delaware and was first
         incorporated on January 30, 1947, in the State of Delaware, and was
         incorporated in the State of Delaware immediately prior to the filing
         of this Certificate of Conversion to Limited Partnership.

     3.  The name of the Limited Partnership into which the Corporation shall be
         converted as set forth in its certificate of limited partnership is
         Texas Eastern Transmission, LP.

     4.  The conversion of the Corporation to the Limited Partnership has been
         approved in accordance with the provisions of Sections 228 and 266 of
         the GCL.

     5.  The conversion of the Corporation to the Limited Partnership shall be
         effective on April 16, 2001.
<PAGE>

IN WITNESS WHEREOF, the undersigned have executed this Certificate of Conversion
to Limited Partnership as of the date first-above written.

TEXAS EASTERN TRANSMISSION                      TEXAS EASTERN
CORPORATION                                     TRANSMISSION, LP

                                                BY DUKE ENERGY GAS
                                                TRANSMISSION SERVICES, LLC
                                                General Partner

By:/s/ Robert B. Evans                          By:/s/ Dorothy M. Ables
   ----------------------                          -----------------------
Name:  Robert B. Evans                          Name:  Dorothy M. Ables
Title: President                                Title: Senior Vice President and
                                                        Chief Financial Officer<PAGE>

                                                               Exhibit 4(B)-1(A)

                     TEXAS EASTERN TRANSMISSION CORPORATION

                                       TO

                            THE CHASE MANHATTAN BANK

                                                Trustee

                              ___________________

                          First Supplemental Indenture

                           Dated as of April 16, 2001

                              ___________________

                                to the Indenture

                          Dated as of December 1, 2000

                              ___________________

<PAGE>

                             TABLE OF CONTENTS (1)

                                                                    Page
                                                                    ----
                                   ARTICLE 1

                                   AMENDMENTS

SECTION 101.  Amendments............................................  2

                                   ARTICLE 2

                                 MISCELLANEOUS

SECTION 201.    Recitals............................................  3
SECTION 202.    Ratification and Incorporation of Original
                Indenture...........................................  3
SECTION 203.    Executed in Counterparts............................  3
SECTION 204.    Capitalized Terms not Defined.......................  4
-----------
(1)  This Table of Contents does not constitute part of the Indenture or have
     any bearing upon the interpretation of any of its terms and provisions.

                                       i
<PAGE>

     THIS FIRST SUPPLEMENTAL INDENTURE is made as of the 16th day of April,
2001, between TEXAS EASTERN TRANSMISSION CORPORATION, a Delaware Corporation
(the "Company"), having its principal office at 5400 Westheimer Court, Houston,
Texas 77056, and THE CHASE MANHATTAN BANK, a New York banking corporation, as
Trustee (herein called the "Trustee").

                                  WITNESSETH:

        WHEREAS, the Company has heretofore entered into an Indenture, dated as
of December 1, 2000 (the "Original Indenture"), with The Chase Manhattan Bank,
as Trustee;

        WHEREAS, the Original Indenture is incorporated herein by this reference
and the Original Indenture, as amended by this First Supplemental Indenture, is
herein called the "Indenture";

        WHEREAS, the Company has heretofore issued in accordance with the
provisions of the Original Indenture, and now has outstanding, its 7.30% Notes
due 2010 in the aggregate principal amount of $300,000,000;

        WHEREAS, the Original Indenture provides that a partnership may, by
conversion of the Company into such partnership, succeed to, and be substituted
for, the Company upon the satisfaction of certain conditions provided in the
Original Indenture;

        WHEREAS, the Company desires to amend the Original Indenture to add
certain mechanical provisions to the Original Indenture relating to issuers that
are partnerships;

        WHEREAS, this First Supplemental Indenture may be entered into for the
aforementioned purpose without the consent of any Holders of Securities pursuant
to Section 901(9) of the Original Indenture; and

        WHEREAS, all conditions necessary to authorize the execution and
delivery of this First Supplemental Indenture and to make it a valid and binding
obligation of the Company have been done or performed.

        NOW, THEREFORE, in consideration of the agreements and obligations set
forth herein and for other good and valuable consideration, the sufficiency of
which is hereby acknowledged, the parties hereto hereby agree as follows:
<PAGE>

                                   ARTICLE 1

                                   AMENDMENTS

        SECTION 101. Amendments. The following sections of the Original
Indenture are amended as follows:

        (a) Section 101 of the Original Indenture is hereby amended by
     substituting the following definitions in their entirety for the
     definitions of such terms in Section 101 of the Original Indenture:

            (i)   "Board of Directors" means either the board of directors of
        the Company (or, if the Company is a partnership, its general partner)
        or any duly authorized committee thereof.

            (ii)  "Board Resolution" means a copy of a resolution certified by
        the Secretary or an Assistant Secretary of the Company (or, if the
        Company is a partnership, of its general partner) to have been duly
        adopted by the Board of Directors and to be in full force and effect on
        the date of such certification, and delivered to the Trustee.

            (iii) "Company Request" or "Company Order" means a written request
        or order signed in the name of the Company by the Chairman of the Board,
        the President or a Vice President, and by the Treasurer, an Assistant
        Treasurer, the Secretary or an Assistant Secretary, of the Company (or,
        if the Company is a partnership, of its general partner), and delivered
        to the Trustee.

            (iv)  "Officers' Certificate" means a certificate signed by the
        Chairman of the Board, the President or a Vice President, and by the
        Treasurer, an Assistant Treasurer, the Secretary or an Assistant
        Secretary, of the Company (or, if the Company is a partnership, of its
        general partner), and delivered to the Trustee. One of the officers
        signing an Officers' Certificate given pursuant to Section 1005 shall be
        the principal executive, financial or accounting officer of the Company
        (or if the Company is a partnership, of its general partner).

            (v)   "Vice President," when used with respect to the Company, the
        general partner of the Company (if the Company is a partnership), or the
        Trustee, means any vice president, whether or not designated by a number
        or a word or words added before or after the title "vice president."

        (b) Section 105(2) of the Original Indenture is hereby amended to add
     the words "(or, if the Company is a partnership, the Treasurer of its
     general partner)" immediately after the word "Treasurer" in such Section.

                                       2
<PAGE>

        (c) Section 201 of the Original Indenture is hereby amended to add the
     words "(or, if the Company is a partnership, of its general partner)"
     immediately after the words "Secretary or an Assistant Secretary of the
     Company" in the first paragraph of such Section.

        (d) Section 301 of the Original Indenture is hereby amended to add the
     words "(or, if the Company is a partnership, of its general partner)"
     immediately after the words "Secretary or an Assistant Secretary of the
     Company" in the last paragraph of such Section.

        (e) Section 303 of the Original Indenture is hereby amended to
     substitute the following two paragraphs for the first two paragraphs of
     such Section:

        "The Securities shall be executed on behalf of the Company by the
      Chairman of the Board, the President or one of the Vice Presidents of the
      Company (or, if the Company is a partnership, of its general partner),
      attested by the Secretary or one of the Assistant Secretaries of the
      Company (or, if the Company is a partnership, of its general partner).
      The signature of any of these officers on the Securities may be manual or
      facsimile.

        "Securities bearing the manual or facsimile signatures of individuals
      who were at any time the proper officers of the Company (or, if the
      Company is a partnership, of its general partner) shall bind the Company,
      notwithstanding that such individuals or any of them have ceased to hold
      such offices prior to the authentication and delivery of such Securities
      or did not hold such offices at the date of such Securities."

                                   ARTICLE 2

                                 MISCELLANEOUS

        SECTION 201. Recitals. The recitals in this First Supplemental Indenture
are made by the Company only and not by the Trustee; the Trustee makes no
representation and shall have no responsibility for, and in respect of, the
validity or sufficiency of this First Supplemental Indenture or the execution
hereof by the Company; and all of the provisions contained in the Original
Indenture in respect of the rights, privileges, immunities, powers and duties of
the Trustee shall be applicable in respect of this First Supplemental Indenture
as fully and with like effect as if set forth herein in full.

        SECTION 202. Ratification and Incorporation of Original Indenture. As
supplemented hereby, the Original Indenture is in all respects ratified and
confirmed, and the Original Indenture and this First Supplemental Indenture
shall be read, taken and construed as one and the same instrument.

        SECTION 203. Executed in Counterparts. This First Supplemental Indenture
may be executed in several counterparts, each of which shall be deemed to be

                                       3
<PAGE>

an original, and such counterparts shall together constitute but one and the
same instrument.

        SECTION 204. Capitalized Terms not Defined. Any capitalized terms not
defined in this First Supplemental Indenture shall have the definitions provided
in the Original Indenture.

                                       4
<PAGE>

        IN WITNESS WHEREOF, the parties hereto have caused this instrument to be
duly executed as of the day and year first above written.

                                            TEXAS EASTERN TRANSMISSION
                                              CORPORATION

                                            By: /s/ Alan N. Harris
                                               --------------------------------
                                                Vice President, Controller
                                                 and Treasurer

Attest:

 /s/ Beverly J. Fite
----------------------------
 Assistant Secretary

                                            THE CHASE MANHATTAN BANK,
                                              as Trustee

                                            By: /s/ J.D. Heaney
                                               --------------------------------
                                                J.D. Heaney
                                                Vice President

Attest:

 /s/ Diane Darconte
----------------------------

                                       5

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00026-of-00352.parquet"}]]