Selling, general and administrative expenses for the three months ended July 31, 2022 and 2021 were $11.0 million, or 9.3% of corresponding consolidated revenues, and $9.9 million, or 7.8% of corresponding consolidated revenues, respectively.
Consolidated revenues for the six months ended July 31, 2022 were $218.4 million, which represented a decrease of $40.9 million, or 15.8%, from consolidated revenues of $259.3 million reported for the six months ended July 31, 2021.
The revenues of power industry services decreased by $30.9 million to $165.3 million for the six months ended July 31, 2022, from $196.2 million reported for the six months ended July 31, 2021. The revenues of this reportable segment of our business represented 75.7% and 75.6% of corresponding consolidated revenues for the six months ended July 31, 2022 and 2021, respectively. The industrial services business reported revenues of $45.5 million for the six months ended July 31, 2022. This amount represented a decrease of $11.3 million, or 19.9%, from revenues of $56.8 million reported by TRC for the six months ended July 31, 2021. Revenues provided by this reportable business segment represented 20.8% and 21.9% of corresponding consolidated revenues for the six months ended July 31, 2022 and 2021, respectively.
Consolidated gross profit for the six-month period ended July 31, 2022 was $44.1 million, or 20.2% of the corresponding consolidated revenues, which also reflected favorable contributions from all three reportable business segments. For the six-month period ended July 31, 2021, the consolidated gross profit was $51.4 million, which represented approximately 19.8% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the six months ended July 31, 2022 and 2021 were $21.6 million, or 9.9% of corresponding consolidated revenues, and $20.2 million, or 7.8% of corresponding consolidated revenues, respectively.
Due substantially to the unfavorable income tax expense adjustment recorded during the three months ended July 31, 2022 in the approximate amount of $6.2 million related to the settlement of claims with the IRS as discussed in Note 10 to our accompanying condensed consolidated financial statements, income tax expense increased to $9.7 million for the quarter from $4.2 million for the three months ended July 31, 2021. Likewise, the amount of this adjustment was the most significant component of income tax expense for the six months ended July 31, 2022, which was $12.0 million. Income tax expense for the six months ended July 31, 2021 was $8.0 million.
Excluding the effect of the IRS settlement adjustment, our effective income tax rates for the three and six months ended July 31, 2022 were 25.2% and 24.4%, respectively. For the three and six months ended July 31, 2021, our effective income tax rates were 24.6% and 25.2%, respectively.
For the three months ended July 31, 2022, our overall operating profit performance resulted in net income in the amount of $4.2 million, or $0.30 per diluted share. For the comparable period last year, we reported net income in the amount of $12.9 million, or $0.81 per dilutive share. For the six months ended July 31, 2022 and 2021, net income was $11.7 million, or $0.80 per diluted share, and $23.6 million, or $1.48 per diluted share. The unfavorable income tax expense adjustment identified above reduced net income per diluted share for the three and six months ended July 31, 2022 by $0.43 and $0.42, respectively.
Engineering, Procurement and Construction Service Contracts
At July 31, 2022, our consolidated project backlog amount of $0.7 billion substantially consisted of the projects of the power industry services reporting segment. The comparable backlog amount as of January 31, 2022 was also $0.7 billion. Our reported amount of project backlog at a point in time represents the total value of projects awarded to us that we consider to be firm as of that date less the amounts of revenues recognized to date on the corresponding projects (project backlog is larger than the value of remaining unsatisfied performance obligations, or RUPO, on active contracts; see Note 2 to the accompanying consolidated financial statements).
Typically, we include the total value of EPC services and other major construction contracts in project backlog when we receive a corresponding notice to proceed from the project owner. However, we may include the value of an EPC services contract prior to the receipt of a notice to proceed if we believe that it is probable that the project will commence within a reasonable timeframe, among other factors. Projects that are awarded to us may remain included in our backlog for extended periods of time as customers experience project delays. However, cancellations or reductions may occur that would reduce project backlog and that could adversely affect our expected future revenues.