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| Project Profile |
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| Client: |
Deltak Corporation |
| Description: |
HP/LP Header Modification |
Location:
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Florida Power Corporation, Tiger Bay Facility, Fort Meade, FL |
| Synopsis: Bremco, Inc. was contacted
in early October, 1998 to assist in the modification and alteration of the HP/LP lower
headers in a Deltak DINO Model 5676 HRSG. The unit had been originally designed for a base
load operation with a minimum number of cycles planned per year. Upon Florida Power
Corporation acquiring the plant it was decided the unit would run on a demand and cycling
operation. An engineering study was completed which involved the installation of
thermocouples within the various sections of the HRSG to determine the affects of cycling
stresses. It was determined through this engineering study that the HPILP lower economizer
headers would require splitting and separating to avoid tube cracking problems from unit
cycling. The HRSG was built in "C-sections" which include eight (8) left hand
and eight (8) right hand tube panel sections. The
modification plan developed included the following:
- Remove the LP portion of the common header beginning at the location
of the internal HP separation plate. This plate would now become the HP header end plate
or head. In order for header clearance, ten (10) LP tube sections would have to be removed
as well.
- Fabricate and install new LP header sections with tube stubs shop
attached. Due to space requirements for new LP header end plate the new header tube stubs
were offset approximately 7/8" from the original location.
Scope of Supply:
- Bremco, Inc. would supply all detailed drawings required for the
complete shop fabrication of LP header sections and tube attachments. Drawings were
developed from arrangement sketches and a list of design requirements provided by Deltak
Corporation. Deltak provided all required ASME code calculations.
- Bremco, Inc. would supply all materials and shop fabrication
required to supply sixteen LP economizer lower header sections. Each header would be built
to ASME Section I and be stamped accordingly with all appropriate certification
documentation. All headers were to be stress relieved and NDE inspected prior to shipping.
Final assembly and hydrostatic test would be performed in the field.
- Bremco, Inc. would supply all designed repair methods and provide
full field services including supervision and craft labor to complete the HP/LP header
modifications.
- Bremco, Inc. would provide a schedule of deliverables to include
fabrication, shipping and field modifications.
LP Header Fabrication
End Plates Welded
Tube Holes Drilled |
Q.C. Holding Area
NDE Dye Penetrant
Ready for Post Weld
Heat Treat |
Tube Stub Weld Attachment |
Sever & Prep Machine Cut HP/LP Header
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Modified HP Header EndModified LP Header
Installed
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