CASE HISTORY
NO. 12104
JANURARY 2009
CLIENT:
Shell Philippines Exploration (SPEX)
Malampaya On-Shore Gas Plant
Batangas, Philippines
UNIT:
E-111 Inlet Gas Heater
193 U-tubes, A179 Carbon Steel
1" 0 .0 . x 10 BWGx 11'2" straight leg


Operating Temperature
Operating Pressure
Shell Side (Steam)
162° C
3.5 barg
Tube Side (Sour Gas)
73° C
128 barg

PROBLEM:

Severe external corrosion of bottom half of the unit, between the tubesheet and first support sheet. Additional damage was also detected up to the 4th support sheet.


SOLUTION:

Installation of CTI Shields made of 321S5, 126" long. Two wall thicknesses (.022";'028") were supplied, using the heavier walled Shields into the more damaged tubes. All Shields were hydraulically expanded their full-length followed by mechanical expansions. The plant removed/cut-out existing division plate for unobstructed access to the tubesheet / tubes. (see photo) Upon completion of the job and a successful hydrotest, Shell's Sr. Maintenance Engineer said "There will be no question about using the services of CTI again in the near future.”

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