FIRST AMENDMENT TO CREDIT AND SECURITY AGREEMENT

      THIS FIRST AMENDMENT, dated as of January 16, 1996, amends and modifies a
certain Credit and Security Agreement, dated as of December 19, 1995 (the
"Credit Agreement"), between FBS BUSINESS FINANCE CORPORATION, a Delaware
corporation (the "LENDER"), and CRYENCO, INC., a Colorado corporation and
CRYENCO SCIENCES, INC., a Delaware corporation (collectively and/or individually
the "BORROWER").  Terms not otherwise expressly defined herein shall have the
meanings set forth in the Credit Agreement.

                                PRELIMINARY STATEMENT

      WHEREAS, the Borrower and the Lender desire to amend the Credit Agreement
as hereinafter set forth;

      NOW, THEREFORE, for value received, the Borrower and the Lender agree as
follows:

                                ARTICLE I - AMENDMENTS

      1.1   BORROWER.  The Credit Agreement and SUPPLEMENT A thereto are hereby
amended to add Cryenex, Inc., a Delaware corporation, as a "Borrower".  All
references to the Borrower therein and in any Loan Document shall include
Cryenex, Inc.

      1.2   DEFINITIONS.  The following definitions of the terms "ALT" and
"Cryenex" are hereby added to SECTION 1.1 of the Credit Agreement:

            "ALT":  Applied LNG Technologies USA, LLC, a Delaware limited
            liability company, whose members are Cryenex and Golden Spread
            Energy, Inc.

            "CRYENEX":  Cryenex, Inc., a Delaware corporation.

            "REPURCHASE OBLIGATION":  The obligation of CSI to repurchase from
            either The CIT Group/Equity Investments, Inc. or Chemical Bank
            warrants held by either such entity for issuance of common stock of
            CSI.

      1.3   GRANT OF SECURITY INTEREST.  SECTION 3.1 (d) of the Credit
Agreement is hereby amended in its entirety to read as follows:

            (d)    General Intangibles (excluding the membership interest of
                   Cryenex in ALT;

      1.4   ORGANIZATION.  SECTION 4.1 of the Credit Agreement is hereby
amended in its entirety to read as follows:




            4.1    ORGANIZATION. Each of Cryenco, CSI and Cryenex is a
            corporation duly incorporated, validly existing and in good
            standing under the laws of the jurisdiction of its respective
            incorporation. Each of Cryenco, CSI and Cryenex is in good standing
            and is duly qualified to do business in each state where, because
            of the nature of its respective activities or properties, such
            qualification is required.  On the date hereof, each of Cryenco,
            CSI and Cryenex conducts business in its own name exclusively and
            has no trade names, styles or doing business forms except as
            disclosed on SCHEDULE 4.1.  Cryenco's taxpayer identification
            number is I.D. No.  84-0767496.  CSI's taxpayer identification
            number is I.D. No. 52-1471630.  As of January 16, 1996, Cryenex has
            filed an application for a taxpayer identification number, but no
            number has been assigned.

      1.5   RESTRICTED PAYMENTS.  SECTION 6.8 of the Credit Agreement is hereby
amended in its entirety to read as follows:

            6.8    RESTRICTED PAYMENTS.  Purchase or redeem or otherwise
            acquire for value any shares of the Borrower's stock or any
            warrants for the issuance of the Borrower's stock (other than the
            issuance of common stock for warrants), or declare or pay any
            dividends thereon (other than stock dividends, dividends payable to
            the Borrower and dividends payable with respect to the preferred
            stock of CSI which is issued and outstanding as of the date of this
            Agreement or is issued and outstanding subsequent hereto in the
            form of dividends on preferred stock of CSI), or make any
            distribution to stockholders as such (other than the Borrower) or
            set aside any funds for any such purpose, or prepay, purchase or
            redeem any subordinated Indebtedness of the Borrower prior to the
            scheduled maturity thereof (except for prepayments to The CIT
            Group/Equity Investments, Inc. in respect of the Senior
            Subordinated Note due 1998 and dated September 3, 1991, issued by
            the Borrower's predecessors in interest, in the original amount of
            $2,200,000, as long as any such prepayment is made when there has
            not occurred and is continuing an Event of Default or an Unmatured
            Event of Default under this Agreement and so long as any such
            prepayment would not result in an Event of Default or Unmatured
            Event of Default) or use any proceeds of Collateral or any proceeds
            of Loans to make any scheduled payment to The CIT Group/Equity
            Investments, Inc. in respect of the above-mentioned Senior
            Subordinated Note at any time when there has occurred and is
            continuing an Event of Default or an

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            Unmatured Event of Default or if the making of such payment would
            result in the occurrence of any Event of Default or Unmatured Event
            of Default; or make any payment to Charterhouse Group
            International, Inc. in respect of management fees unless and only
            to the extent that the amount of the Borrowing Base exceeds the
            amount of the Obligations by at least $500,000 immediately after
            the payment and PROVIDING FURTHER, that prior to and after the
            making of any such payment to Charterhouse Group International,
            Inc., there has not occurred an Event of Default or an Unmatured
            Event of Default under this Agreement.

      1.6   INVESTMENTS.  Clause (g) of SECTION 6.10 of the Credit Agreement is
hereby amended in its entirety to read as follows:

            (g)    Investments in ALT not exceeding $1,200,000 during the
            Borrower's 1996 fiscal year, and for any fiscal year thereafter,
            Investments in ALT which do not exceed in the aggregate the amount
            by which the consolidated EBITDA of the Borrower during the most
            recent four consecutive fiscal quarters exceeds the sum of their
            consolidated unfinanced capital expenditures, cash taxes, interest
            payments, dividends and mandatory debt retirement payments during
            the same four consecutive fiscal quarters, by at least 25%,
            PROVIDED, HOWEVER, that no such Investments shall be permitted
            after the occurrence and during the continuance of any Event of
            Default or any Unmatured Event of Default under this Agreement or
            if such Investment would result in the occurrence of an Event of
            Default or Unmatured Event of Default, and PROVIDED, FURTHER that
            Investments in ALT in excess of $490,000 made during the term of
            this Agreement shall be in the nature of extensions of credit to
            ALT, which extensions of credit shall be evidenced by one or more
            promissory notes containing terms and conditions reasonably
            satisfactory to the Lender and such promissory notes shall be
            pledged to the Lender to secure payment and performance of the
            Obligations;

      1.7   USE OF PROCEEDS.  SECTION 6.16 of the Credit Agreement is hereby
amended in its entirety to read as follows:

            6.16   USE OF PROCEEDS.  Use or permit any proceeds of the Loans to
            be used (a) either directly or indirectly, for the purpose, whether
            immediate, incidental or ultimate, of "purchasing or carrying any
            margin stock" within the meaning of Regulation U of the Federal
            Reserve Board, as amended from time to time, and furnish to the


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            Lender upon request, a statement in conformity with the
            requirements of Federal Reserve Form U-1 referred to in Regulation
            U of the Federal Reserve Board or (b) for purposes other than the
            working capital needs and general business purposes of Cryenco,
            including uses permitted by this Agreement.

      1.8   EVENTS OF DEFAULT.  SECTION 7.1(c) is amended in its entirety to
read as follows:

            (c)    ACCELERATION OF OTHER INDEBTEDNESS.  Any event or condition
            shall occur which results in the acceleration of the maturity of
            any Indebtedness of, or guaranteed by, the Borrower or any other
            Obligor or in the enforcement of any Repurchase Obligation or
            enables the holder or holders of such other Indebtedness or any
            trustee or agent for such holders (any required notice of default
            having been given and any applicable grace period having expired)
            to accelerate the maturity of such other Indebtedness or enables
            the holder of any Repurchase Obligation or any  trustee or  agent
            for such holder to enforce any Repurchase Obligation;

      1.9   SCHEDULE 6.11.  SCHEDULE 6.11 is amended in its entirety in the
form attached hereto as AMENDED SCHEDULE 6.11.

      1.10  CONSTRUCTION.  All references in the Credit Agreement to "this
Agreement," "herein" and similar references shall be deemed to refer to the
Credit Agreement as amended by this Amendment.

                     ARTICLE II - REPRESENTATIONS AND WARRANTIES

      2.1   AUTHORIZATION; VALIDITY AND BINDING EFFECT.  To induce the Lender
to enter into this Amendment and to make and maintain the Loans under the Credit
Agreement as amended hereby, the Borrower hereby warrants and represents to the
Lender that it is duly authorized to execute and deliver this Amendment and each
other document delivered in connection herewith, and to perform its obligations
under the Credit Agreement as amended hereby and each other document delivered
in connection herewith, that this Amendment and the other documents delivered in
connection herewith constitute the legal, valid and binding obligations of the
Borrower, enforceable in accordance with their respective terms, and that the
Borrower has taken all action necessary under its Articles of Incorporation,
Bylaws and applicable law regarding the transactions contemplated herein.

      2.2   AFFIRMATION OF REPRESENTATIONS AND WARRANTIES.  The Borrower hereby
restates all the representations and warranties in Article IV of the Credit
Agreement and affirms to the Lender that such representations and warranties are
true and correct as though made on the date hereof the same as if made on the
date hereof


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and fully set forth herein, except for changes that are permitted by the terms
of the Credit Agreement.

      2.3   WARRANTS.  All outstanding warrants for the issuance of common
stock of CSI and the holders thereof are listed on SCHEDULE 2.3  hereto.  CSI
has delivered to the Lender, concurrent with the execution and delivery of this
Amendment true, correct and complete copies of all documents with respect to
which CSI and Chemical Bank are parties and that embody all agreements between
CSI and Chemical Bank with respect to CSI warrants held by Chemical Bank,
including all amendments, modifications and supplements to any such documents.

      2.4   JOINT VENTURE AGREEMENT.  The Borrower has delivered to the Lender
true, correct and complete copies of all documents that embody the joint venture
agreement for ALT, including all amendments, modifications and supplements
thereto.

                          ARTICLE III - CONDITIONS PRECEDENT

      This Amendment shall become effective on the date first set forth above;
PROVIDED, HOWEVER, that the effectiveness of this Amendment is subject to the
satisfaction of each of the following conditions precedent:

      3.1   WARRANTIES.  Before and after giving effect to this Amendment, the
representations and warranties in Article IV of the Credit Agreement shall be
true and correct as though made on the date hereof, except for changes that are
permitted by the terms of the Credit Agreement.

      3.2   DEFAULTS.  Before and after giving effect to this Amendment, no
Event of Default and no Unmatured Event of Default shall have occurred and be
continuing under the Credit Agreement.  The execution by the Borrower of this
Amendment shall be deemed a representation that the Borrower has complied with
the foregoing condition.

      3.3   DOCUMENTS.  The following shall have been delivered to the Lender,
each duly executed and dated, or certified, as of the date hereof, as the case
may be:

            (a)    RESOLUTIONS.  Certified copies of resolutions of the Board
            of Directors of each of Cryenco, CSI and Cryenex authorizing or
            ratifying the execution, delivery and performance, respectively, of
            this Amendment and other documents provided for in this Amendment.

            (b)    CONSENTS.  Certified copies of all documents evidencing any
            necessary corporate action, consent or governmental or regulatory
            approval (if any) with respect to this Amendment.


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            (c)    INCUMBENCY AND SIGNATURES.  A certificate of the Secretary
            or an Assistant Secretary of Cryenex certifying the names of the
            officer or officers of Cryenex authorized to sign this Amendment
            and other documents provided for in this Amendment, together with a
            sample of the true signature of each such officer.

            (d)    CERTIFICATE OF INCORPORATION AND BY-LAWS.  A certified copy
            of the Certificate or Articles of Incorporation and the By-laws of
            Cryenex, certified by the Secretary or an Assistant Secretary of
            Cryenex.

            (e)    CERTIFICATE OF GOOD STANDING.  A certificate of good
            standing as to Cryenex issued by the Secretary of State of the
            state in which Cryenex is organized, and each other state in which
            the failure of Cryenex to be in good standing would constitute an
            Adverse Event or have a material adverse effect on the Lender's
            rights in any Collateral or Third Party Collateral.

            (f)    FINANCING STATEMENTS.  UCC-1 financing statements executed
            by Cryenex and substantially in the form of financing statements
            executed and delivered to the Lender by CSI and Cryenco.

Notwithstanding the opening paragraph of this Article III, the certificate of
good standing may be delivered no later than ten days following the date hereof.

                                 ARTICLE IV - GENERAL

      4.1   EXPENSES.  The Borrower agrees to reimburse the Lender upon demand
for all reasonable expenses (including reasonable attorneys' fees and legal
expenses) incurred by the Lender in connection with the preparation of this
Amendment and in enforcing the obligations of the Borrower hereunder, and to pay
and save the Lender harmless from all liability for any stamp or other taxes
which may be payable with respect to the execution or delivery of this
Amendment, which obligations of the Borrower shall survive any termination of
the Credit Agreement.

      4.2   COUNTERPARTS.  This Amendment may be executed in as many
counterparts as may be deemed necessary or convenient, and by the different
parties hereto on separate counterparts, each of which, when so executed, shall
be deemed an original but all such counterparts shall constitute but one and the
same instrument.

      4.3   SEVERABILITY.  Any provision of this Amendment which is prohibited
or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining portions hereof or affecting the validity or
enforceability of such provisions in any other jurisdiction.


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      4.4   LAW.  This Amendment shall be a contract made under the laws of the
State of Minnesota, which laws shall govern all the rights and duties hereunder.

      4.5   SUCCESSORS; ENFORCEABILITY.  This Amendment shall be binding upon
the Borrower and the Lender and their respective successors and assigns, and
shall inure to the benefit of the Borrower and the Lender and the successors and
assigns of the Lender.  Except as hereby amended, the Credit Agreement shall
remain in full force and effect and is hereby ratified and confirmed in all
respects.



                         [SIGNATURE PAGE IMMEDIATELY FOLLOWS]


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      IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized as of the date
first written above.

                                       FBS BUSINESS FINANCE CORPORATION


                                       By /s/ William C. Phelps 
                                          --------------------------------------
                                         Its  Vice President
                                             -----------------------------------

                                       CRYENCO, INC.


                                       By /s/ James A. Raabe
                                          --------------------------------------
                                         Its  CFO
                                             -----------------------------------


                                       CRYENCO SCIENCES, INC.


                                       By /s/ James A. Raabe 
                                          --------------------------------------
                                         Its  CFO
                                             -----------------------------------


                                       CRYENEX, INC.


                                       By  /s/ James A. Raabe 
                                          --------------------------------------
                                         Its  Secretary
                                             -----------------------------------


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