<SEC-DOCUMENT>0000892553-18-000032.txt : 20180215
<SEC-HEADER>0000892553-18-000032.hdr.sgml : 20180215
<ACCEPTANCE-DATETIME>20180215104517
ACCESSION NUMBER:		0000892553-18-000032
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180213
FILED AS OF DATE:		20180215
DATE AS OF CHANGE:		20180215

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Evanko Jillian C.
		CENTRAL INDEX KEY:			0001699043

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11442
		FILM NUMBER:		18616582

	MAIL ADDRESS:	
		STREET 1:		1 INFINITY CORPORATE CENTRE DRIVE
		CITY:			GARFIELD HEIGHTS
		STATE:			OH
		ZIP:			44125

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CHART INDUSTRIES INC
		CENTRAL INDEX KEY:			0000892553
		STANDARD INDUSTRIAL CLASSIFICATION:	FABRICATED PLATE WORK (BOILER SHOPS) [3443]
		IRS NUMBER:				341712937
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3055 TORRINGTON DRIVE
		CITY:			BALL GROUND
		STATE:			GA
		ZIP:			30107
		BUSINESS PHONE:		770-721-8800

	MAIL ADDRESS:	
		STREET 1:		3055 TORRINGTON DRIVE
		CITY:			BALL GROUND
		STATE:			GA
		ZIP:			30107
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_151870950320375.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-02-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000892553</issuerCik>
        <issuerName>CHART INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>GTLS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001699043</rptOwnerCik>
            <rptOwnerName>Evanko Jillian C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3055 TORRINGTON DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BALL GROUND</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, CFO, CAO and Treasurer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock, par value $0.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2018-02-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>435</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>47.70</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14755</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person surrendered 435 shares subject to the restricted share unit award, to satisfy tax withholding liabilities associated with the award, in an exempt transaction under Rule 16b-3</footnote>
        <footnote id="F2">2,454 and 11,510 shares of the total amount beneficially owned were granted on February 13, 2017 and January 2, 2018, respectively, pursuant to restricted share unit agreements under the Chart Industries, Inc. Amended and Restated 2009 Omnibus Equity Plan and the Chart Industries, Inc. 2017 Omnibus Equity Plan, respectively, in an exempt transaction under Rule 16b-3 and remain subject to restriction.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jillian C. Evanko, by Derek B. Swanson, her attorney-in-fact</signatureName>
        <signatureDate>2018-02-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
