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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001140361-08-015213.txt : 20080618
<SEC-HEADER>0001140361-08-015213.hdr.sgml : 20080618
<ACCEPTANCE-DATETIME>20080618140105
ACCESSION NUMBER:		0001140361-08-015213
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20080617
FILED AS OF DATE:		20080618
DATE AS OF CHANGE:		20080618

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:			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:		08905335

	BUSINESS ADDRESS:	
		STREET 1:		667 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065-8087
		BUSINESS PHONE:		212-521-2000

	MAIL ADDRESS:	
		STREET 1:		667 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065-8087

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:		08905336

	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
</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>2008-06-17</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>9 GREENWAY PLAZA</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 2800</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77046</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 AVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10065-8087</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Units representing limited partner interests</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-06-17</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>22866667</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>30.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>22866667</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22866667</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each Class B Unit will be convertible into one Common Unit of the issuer on a one-for-one basis upon demand by the holder at any time after June 30, 2013. The Class B Units have no expiration date.</footnote>
        <footnote id="F2">BPHC directly owns all securities reported on this Form 4. Loews Corporation's ownership form is indirect, through BPHC. Information regarding Loews Corporation is set forth on Exhibit 99.1 to this Form 4.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jamie Buskill, Chief Financial Officer on behalf of Boardwalk Pipelines Holding Corp.</signatureName>
        <signatureDate>2008-06-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>misc1.htm
<DESCRIPTION>MISCELLEANOUS EXHIBITS
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Madison Avenue</font></div>
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New York, NY 10065</font></div>
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Corporation</font></div>
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Vice President</font></div>
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