EXHIBIT 23.4

                       CONSENT OF INDEPENDENT ACCOUNTANTS

   We hereby consent to the use in this Post-Effective Amendment No. 1 to the
Registration Statement on Form S-4 of our report dated March 30, 1998, relating
to the financial statements of OEC Compression Corporation for the year ended
December 31, 1997, which appears in such Registration Statement. We also
consent to the reference to us under the headings "Experts" and "Selected
Historical Financial Data--OEC" in such Registration Statement.

                                          /s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

February 5, 2001