ERC INDUSTRIES INC /DE/
SC 13D/A, 1996-08-02
OIL & GAS FIELD MACHINERY & EQUIPMENT
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 10)*

                              ERC Industries, Inc.
- - --------------------------------------------------------------------------------
                               (Name of Issuer)
 
                   Common Stock, par value $0.01 per share
- - --------------------------------------------------------------------------------
                        (Title of Class of Securities)
 
                                   268912102
                 ---------------------------------------------
                                (CUSIP Number)
 
                  Arthur M. Nathan, Haynes and Boone, L.L.P.
           1000 Louisiana Street, Suite 4300, Houston, Texas 77002 
                                (713) 547-2000
- - ------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices
 and Communications)
 
                                 July 29, 1996
          -----------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
 
                                  SCHEDULE 13D
<TABLE>
<CAPTION>
 
- - --------------------------
CUSIP No. 268912102                                Page   2 of   6 Pages
- - --------------------------                              ---    --- 
 
- - ------------------------------------------------------------------------------
  <S>   <C>          
        NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                           
  1        John Wood Group PLC, a company registered in Scotland and 
               incorporated under the laws of the United Kingdom

- - ------------------------------------------------------------------------------
        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP               (a) [ ]

  2                                                                    (b) [ ]
 
- - ------------------------------------------------------------------------------
        SEC USE ONLY
  3 

- - ------------------------------------------------------------------------------
        SOURCE OF FUNDS
  4 
           WC
- - ------------------------------------------------------------------------------
        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
        ITEMS 2(d) OR 2(e)                                                 [ ]
  5                           
                             
- - ------------------------------------------------------------------------------
        CITIZENSHIP OR PLACE OF ORGANIZATION
  6                             
 
          United Kingdom
- - ------------------------------------------------------------------------------
                 7       SOLE VOTING POWER                           

                            17,497,002                           
               ---------------------------------------------------------------
  NUMBER OF      8       SHARED VOTING POWER                      
   SHARES   
BENEFICIALLY                0
  OWNED BY     ---------------------------------------------------------------
    EACH         9       SOLE DISPOSITIVE POWER
  REPORTING 
   PERSON                   17,497,002
    WITH       ---------------------------------------------------------------
                 10      SHARED DISPOSITIVE POWER

                            0
- - ------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
                  17,497,002
- - ------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
               CERTAIN SHARES                                              [ ]
 
- - ------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
                  82.3%
- - ------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*
 
                  CO
- - ------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
  The Schedule 13D dated October 19, 1992, as amended by Amendment No. 1 thereto
dated December 3, 1992, Amendment No. 2 thereto dated December 7, 1992,
Amendment No. 3 thereto dated January 11, 1993, Amendment No. 4 thereto dated
April 30, 1993, Amendment No. 5 thereto dated July 29, 1993, Amendment No. 6
thereto dated March 13, 1996, Amendment No. 7 thereto dated March 22, 1996,
Amendment No. 8 thereto dated June 12, 1996 and Amendment No. 9 thereto dated
July 24, 1996 (the "Schedule 13D") of John Wood Group PLC (the "Reporting
Person"), relating to the Common Stock, $.01 par value per share, of ERC
Industries, Inc., a Delaware corporation (formerly known as ERC Subsidiary,
Inc., successor by merger to ERC Industries, Inc.), is hereby amended and
supplemented as set forth below.  Defined terms used in this Amendment No. 10
and not defined herein shall have their respective meanings as set forth in the
Schedule 13D.


Item 3.  Source and Amount of Funds or Other Consideration.
- - ------   ------------------------------------------------- 

Item 3 is hereby amended by adding the following paragraphs:

  "The $1,124,736.60 used to make the purchase reported by this Amendment No. 10
to Schedule 13D came from the Reporting Person's working capital."


Item 4.  Purposes of the Transaction.
- - ------   --------------------------- 

Item 4 is hereby amended by adding the following paragraphs:

  "On July 29, 1996, the Reporting Person entered into an oral agreement with a
brokerage firm whereby a client of such firm agreed to sell and the Reporting
Person agreed to purchase an aggregate of 865,182 shares of Common Stock in a
privately-negotiated transaction.  The purchase price for such shares of Common
Stock was $1.30 per share, inclusive of commissions (or an aggregate
consideration of $1,124,736.60).  The transaction was conducted entirely between
the Reporting Person and the brokerage firm, and there was no agreement or other
documentation prepared in connection with the transaction.

  On June 6, 1996, the Reporting Person entered into an Investment Agreement
(the "Investment Agreement") pursuant to which the Reporting Person purchased
and the Company sold an aggregate of 7,384,616 shares of Common Stock at a
purchase price of $0.8125 (13/16) per share (or an aggregate consideration of
$6,000,000.50).  This transaction was disclosed in Amendment No. 8 to Schedule
13D dated June 12, 1996.  In addition, on July 23, 1996, the Reporting Person
purchased an aggregate of 1,164,000 shares of Common Stock in a privately-
negotiated transaction at a purchase price per share of  $1.30 (or an aggregate
consideration of $1,513,200).  This transaction was reported in Amendment No. 9
to Schedule 13D dated July 24, 1996.

  As a result of the purchase of these additional shares, the Reporting Person
currently owns an aggregate of 17,497,002 shares of Common Stock representing
approximately 82.3% of the outstanding shares of Common Stock."

Item 5.  Interest in Securities of the Issuer.
- - ------   ------------------------------------ 

  The information set forth in Item 4 of this Amendment No. 10 is incorporated
by reference in response to this Item 5.

                               Page 3 of 6 Pages
<PAGE>
 
Item 6.     Contracts, Arrangements, Understandings or Relationships with
- - ------      -------------------------------------------------------------
            Respect to Securities of the Issuer.
            ----------------------------------- 

        The information set forth in Item 4 of this Amendment No. 10 is
incorporated by reference in response to this Item 6.

Item 7.     Material to be Filed as Exhibits.
- - ------      -------------------------------- 

Item 7 is hereby amended and restated in its entirety by the following
paragraphs:

        *A  Form of proposed Certificate of Ownership and Merger merging ERC
            Industries, Inc. into ERC Subsidiary, Inc.

        *B  Stock Purchase Agreement dated October 15, 1992 among the John Wood
            Group PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber,
            Lawrence M. Pohly and John L. Teager, as Sellers, and ERC
            Industries, Inc.

        *C  Standstill and Voting Agreement dated October 15, 1992 among John
            Wood Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

        *D  Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group
            PLC and J. Derek P. Jones.

        *E  Notice of Waiver of Conditions to Consummate Purchase Agreement
            dated November 30, 1992.

        *F  Agreement dated December 4, 1992, between the Reporting Person and
            ERC Industries, Inc.

        *G  Agreement dated December 4, 1992, among the Reporting Person, ERC
            Industries, Inc., and the Indemnitees.

        *H  Letter Agreement dated March 5, 1996, between the Reporting Person
            and Quantum.

        *I  Investment Agreement dated June 6, 1996, between the Reporting
            Person and the Company.

        *J  Registration Rights Agreement dated June 6, 1996, between the
            Reporting Person and the Company.



        *   Previously filed.

                               Page 4 of 6 Pages
 
<PAGE>
 
                                   SIGNATURE



  After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this Amendment No. 10 to Schedule 13D is true,
complete and correct.


  Date: August 2, 1996.


                                            JOHN WOOD GROUP PLC



                                            By:  /s/ J. DEREK P. JONES
                                                 -------------------------------
                                                 Name:     J. Derek P. Jones
                                                 Title:    Director

                               Page 5 of 6 Pages
<PAGE>
 
                                 EXHIBIT INDEX


  *A   Form of proposed Certificate of Ownership and Merger merging ERC
       Industries, Inc. into ERC Subsidiary, Inc.

  *B   Stock Purchase Agreement dated October 15, 1992 among the John Wood Group
       PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber, Lawrence M. Pohly
       and John L. Teager, as Sellers, and ERC Industries, Inc.

  *C   Standstill and Voting Agreement dated October 15, 1992 among John Wood
       Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

  *D   Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group PLC
       and J. Derek P. Jones.

  *E   Notice of Waiver of Conditions to Consummate Purchase Agreement dated
       November 30, 1992.

  *F   Agreement dated December 4, 1992, between the Reporting Person and ERC
       Industries, Inc.

  *G   Agreement dated December 4, 1992, among the Reporting Person, ERC
       Industries, Inc., and the Indemnitees.

  *H   Letter Agreement dated March 5, 1996, between the Reporting Person and
       Quantum.

  *I   Investment Agreement dated June 6, 1996, between the Reporting Person and
       the Company.

  *J   Registration Rights Agreement dated June 6, 1996, between the Reporting
       Person and the Company.



  *    Previously filed.
 
                               Page 6 of 6 Pages


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