A leading manufacturer of subsea trees contracted PROTEC to design, manufacture and test an air driven  IWOCS HPU to be incorporated into their installation work over control system (IWOCS) for deepwater subsea trees. The PROTEC IWOCS HPU was designed and certified in accordance with DNV 2.7-1 / 2.7-3 and meets IEC 60079 Class 1, Zone 2 hazardous area classification requirements. The HPU is water/glycol based and meets NAS 1638 Class 6/SAE AS4059C Class 6 (B-F) cleanliness levels. All metallic material in contact with the hydraulic fluid is 316, 316L stainless steel. The hydraulic fluid reservoir is 316 stainless steel (75 gallons). The structural frame is 316 SS tubular construction. There is a 5,000 psig low pressure circuit with two 10-gallon bladder type accumulators and an air driven piston pump. There is a 15,000 psig high pressure circuit with one 5-gallon piston type accumulator and an air driven piston pump. There is one air driven back-up pump.

This PROTEC IWOCS HPU is now the customer’s standard air driven IWOCS HPU.