Business Pilipinas Shell to Upgrade Tabangao Refinery PHStocks 14/12/201615/12/2016 0 Comments Pilipinas Shell, SHLPH Manila—(PHStocks)—Pilipinas Shell Petroleum Corp. (PSE: SHLPH) has taken the decision to proceed with the upgrade of its Tabangao Refinery to enable production. The capital investment is estimated at $13 million.