Exhibit 23.1

Consent of Independent Auditors

We consent to the incorporation by reference in the following Registration Statements:

1. Registration Statement (Form S-8 No. 333-64442) pertaining to the Employee Stock Purchase Plan of Chicago Bridge & Iron Company N.V.,

2. Registration Statement (Form S-8 No. 333-87081) pertaining to the 1999 Long-Term Incentive Plan of Chicago Bridge & Iron Company N.V.,

3. Registration Statement (Form S-8 No. 333-39975) pertaining to the Employee Stock Purchase Plan (1997) of Chicago Bridge & Iron Company N.V.,

4. Registration Statement (Form S-8 No. 333-24443) pertaining to the Management Defined Contribution Stock Incentive Plan of Chicago Bridge & Iron Company N.V.,

5. Registration Statement (Form S-8 No. 333-24445) pertaining to the Long-Term Incentive Plan of Chicago Bridge & Iron Company N.V.,

6. Registration Statement (Form S-8 No. 333-33199) pertaining to the Savings Plan of Chicago Bridge & Iron Company N.V.; of our report dated June 1, 2007, with respect to the combined financial statements ABB Lummus Global as of and for the years ended December 31, 2006, 2005 and 2004, included in this Form 8-K.

/s/ Ernst & Young LLP  

New York, New York
November 15, 2007