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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MNZmfZIIL/ugOV7ztBPbXJc06of0GstLgIAjElrb3vjSVeVxHKMmEjJEt5tqcJnb
 5dLIkerWm11sYcGmtfgvkg==

<SEC-DOCUMENT>0001140361-05-009824.txt : 20051117
<SEC-HEADER>0001140361-05-009824.hdr.sgml : 20051117
<ACCEPTANCE-DATETIME>20051117091153
ACCESSION NUMBER:		0001140361-05-009824
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20051115
FILED AS OF DATE:		20051117
DATE AS OF CHANGE:		20051117

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Boardwalk Pipeline Partners, LP
		CENTRAL INDEX KEY:			0001336047
		STANDARD INDUSTRIAL CLASSIFICATION:	NATURAL GAS TRANSMISSION [4922]
		IRS NUMBER:				203265614
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3800 FREDERICA STREET
		CITY:			OWENSBORO
		STATE:			KY
		ZIP:			42301
		BUSINESS PHONE:		270-926-8686

	MAIL ADDRESS:	
		STREET 1:		3800 FREDERICA STREET
		CITY:			OWENSBORO
		STATE:			KY
		ZIP:			42301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Boardwalk Pipelines Holding Corp.
		CENTRAL INDEX KEY:			0001343044
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32665
		FILM NUMBER:		051211347

	BUSINESS ADDRESS:	
		STREET 1:		3800 FREDERICA STREET
		CITY:			OWENSBORO
		STATE:			KY
		ZIP:			42301
		BUSINESS PHONE:		2709268686

	MAIL ADDRESS:	
		STREET 1:		3800 FREDERICA STREET
		CITY:			OWENSBORO
		STATE:			KY
		ZIP:			42301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LOEWS CORP
		CENTRAL INDEX KEY:			0000060086
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32665
		FILM NUMBER:		051211346

	BUSINESS ADDRESS:	
		STREET 1:		667 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10021-8087
		BUSINESS PHONE:		212-521-2000

	MAIL ADDRESS:	
		STREET 1:		667 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10021-8087
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-11-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001336047</issuerCik>
        <issuerName>Boardwalk Pipeline Partners, LP</issuerName>
        <issuerTradingSymbol>BWP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001343044</rptOwnerCik>
            <rptOwnerName>Boardwalk Pipelines Holding Corp.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3800 FREDERICA STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OWENSBORO</rptOwnerCity>
            <rptOwnerState>KY</rptOwnerState>
            <rptOwnerZipCode>42301</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000060086</rptOwnerCik>
            <rptOwnerName>LOEWS CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>667 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10021</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units representing limited partner interests</value>
            </securityTitle>
            <transactionDate>
                <value>2005-11-15</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2005-11-15</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>53256122</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>53256122</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                    <footnoteId id="F2"/>
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            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Subordinated Units representing limited partner interests</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2005-11-15</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2005-11-15</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>33093878</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>33093878</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33093878</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On November 15, 2005, in connection with the Issuer's initial public offering of common limited partnership units, Boardwalk Pipelines Holding Corp. (BPHC) contributed assets to the Issuer and received 53,256,122 common units and 33,093,878 subordinated limited partnership units of the Issuer.  Loews Corpoation owns 100% of BPHC and thus beneficially owns all the reported securities.  Information regarding Loews is set forth on Exhibit 99 to this Form 4.</footnote>
        <footnote id="F2">BPHC directly owns all securities reported on this Form 4, Loews?s ownership form is indirect, through BPHC.</footnote>
        <footnote id="F3">Each subordinated unit will convert into one common unit at the end of the subordination period. The subordination period will end at such time as the Issuer has earned and paid (a) the minimum quarterly distribution on all of its outstanding units for three consecutive four quarter periods or (b) 150% of the minimum quarterly distribution on all outstanding units for one four quarter period.  The subordinated units will also convert into common units if the Issuer's general partner is removed without cause and units held by affiliates of the general partner are not voted in favor of such removal.  The subordinated units have no expiration date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jamie Buskill, Chief Financial Officer, Boardwalk Pipelines Holding Corp.</signatureName>
        <signatureDate>2005-11-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>misc1.htm
<DESCRIPTION>MISCELLEANOUS EXHIBITS
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  <head>
    <title>
      Unassociated Document
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      regarding joint filer</font></div>
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