The contract was to have been awarded July 13. The audit tender was launched earlier this year in response to various spills from the pipeline in 2005.
New bidding rules will be published July 21, with offers due September 6.
Companies that had been invited to submit bids in the original process included US firms Ionik Consulting and Aptech; UK firms Penspen, Intetech and Moody International; German firms Tuv Nord and ILF Beratende Ingenieure; Mexico's Lloyd Germanico; and GE Oil & Gas PII Pipeline solutions, Bureau Veritas del Peru and Shell Global Solutions International, BNamericas previously reported.
The TGP consortium, led by Argentine engineering firm Techint, operates the pipeline.
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