CASE HISTORY
NO. I3089
JULY 2009
CLIENT:
Celanese (Nanjing) Chemical Co.
Nanjing, China

UNIT:
HE‐323 Vertical Acid Reboiler
812 tubes, Alloy C276
3/4” O.D. x .065” wall

PROBLEM:

Thinning of outlet tube ends (hottest section) with up to 65% wall loss. Tubesheet/ligaments have active corrosion with tube‐to‐tubesheet welds corroded completely in some spots, weakening the joints and creating leaks.


SOLUTION:

In an extremely critical situation, CTI fabricated – within 48 hours ‐ over 800 tube‐end Shields, .028” wall thickness x 6” long, made of C276 material. “Collars” were also fabricated due to the extreme erosion/corrosion at the tube openings. Celanese expedited the air freight of material Nanjing. CTI personnel hand‐carried all tools and equipment to China, arriving in Nanjing before a Purchase Order could even be issued. All Shields/Collars we installed via mechanical expansion into the outlet and the unit then successfully hydrotested.

CUSTOMER COMMENTS:

“I would like to extend my sincere thanks, on behalf of Celanese, to CTI for their understanding and timely support in this critical matter…….You assisted us immensely in very prompt production of the inserts and timely shipment/packaging efforts which had to be worked through to ensure uninterrupted shipment into Nanjing. Thank you again for the valiant and supportive effort.”

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