Exhibit 10.12 AMENDMENT TO THE LIMITED PARTNERSHIP AGREEMENT OF PH GAS, L.P. DATED JULY 16, 2002 APRIL 26, 2003 AMENDMENT TO THE LIMITED PARTNERSHIP AGREEMENT OF PH GAS, L.P. THIS AMENDMENT TO THE LIMITED PARTNERSHIP AGREEMENT is entered into effective April 26, 2003, by and among PHT GAS, LLC (the "General Partner") and those persons listed as Limited Partners on Exhibit A attached hereto. Exhibit A to the Limited Partnership Agreement dated July 16, 2002 is amended to reflect the admission of an additional Limited Partner and additional capital contributions by Limited Partners. IN WITNESS WHEREOF, the General Partner and additional Limited Partners have executed this Amendment the date and year above written. GENERAL PARTNER: PHT GAS, LLC By: ------------------------------------- Mark A. Bush, Managing Member ADDITIONAL LIMITED PARTNERS: SPH INVESTMENTS, INC. By: ------------------------------------- Stephen P. Harrington ESC CONSULTING, INC. By: ------------------------------------- Cecile T. Coady PARTNERS AS OF APRIL 26, 2003 CAPITAL PERCENTAGE CONTRIBUTION INTEREST ------------ -------- LIMITED PARTNERS: - ----------------- Bepariko BioCom $171,000 30.86% 5858 Westheimer Street, Suite 708 Houston, Texas 77057 Mark Tompkins $100,000 18.05% C/o Bodden Corporate Services 802 Grand Pavillion West Bay Road Box 10355 APO Grand Caymen, Cayman Islands Wolver Limited $50,000 9.03% Box 818 Providenciales Turks & Caicos, BWI Haeuser Finincial S.A. $50,000 9.03% C/o Bakers The Mill Mall Tortolla, BVI 1025 Investments, Inc. $106,500 19.22% 711 South Carson Street, 4A Carson City, NV 89701 FEQ Investments, Inc. $28,000 5.05% 24224 Kanis Road Little Rock, AR 72223 SPH Investments, Inc. $28,000 5.05% 111 Presidential Boulevard, Suite 158-A Bala Cynwyd, Pennsylvania 19004 ESC Consulting, Inc. $15,000 2.71% 111 Presidential Boulevard, Suite 158 Bala Cynwyd, Pennsylvnia 19004 GENERAL PARTNER: - ---------------- PHT Gas LLC $5,353 1.0% 5858 Westheimer Street, Suite 708 Houston, Texas 77057