ERC INDUSTRIES INC /DE/
SC 13D/A, 1996-10-02
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. 11)*

                             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)
 
                              September 26, 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


- -----------------------                                  ---------------------
  CUSIP NO. 268912102                                      PAGE 2 OF 5 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      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
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4

      WC
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                                   [ ]
                     

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    

      United Kingdom
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          18,087,702
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             0
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          18,087,702
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      18,087,702
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ]
12                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      
      85.1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      
      CO
- ------------------------------------------------------------------------------



<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 , Amendment No. 9 thereto dated July
24, 1996 and Amendment No.10 thereto dated August 2, 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. 11 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 $767,910.00 used to make the purchase reported by this Amendment No. 11
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 September 26, 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 590,700 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 $767,910.00).  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 July 29, 1996, the Reporting Person entered into a similar transaction
pursuant to which the Reporting Person acquired an aggregate of 865,182 shares
of Common Stock at a purchase price of $1.30 per share, inclusive of commissions
(or an aggregate consideration of $1,124,736.60).  This 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.  This transaction was reported in Amendment No. 10 to Schedule 13D
dated August 2, 1996.

  As a result of the purchase of these additional shares, the Reporting Person
currently owns an aggregate of 18,087,702 shares of Common Stock representing
approximately 85.1% 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. 11 is incorporated
by reference in response to this Item 5.

                               Page 3 of 5 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. 11 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 5 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. 11 to Schedule 13D is true,
complete and correct.


  Date: October 1, 1996.


                                 JOHN WOOD GROUP PLC



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

                               Page 5 of 5 Pages


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