LASS="Normal">EXISTING TANK BOTTOMS

 

Section 16641
CATHODIC PROTECTION FOR EXISTING TANK BOTTOMS
PART 1 GENERAL

1.01 SECTION INCLUDES

A. Requirements for impressed current cathodic protection systems for
the bottom (soil side) of steel water storage tanks that are constructed
at grade level.

B. Specifications for manually controlled transformer-rectifiers and
deep anodes.

1.02 RELATED SECTIONS

A. Section 15640 - Joint Bonding and Electrical Isolation.

B. Section 16640 - Cathodic Protection for Pipelines.

C. Section 16642 - Cathodic Protection for Water Tank Interiors (ICCP).

D. Section 16643 Cathodic Protection for Water Tank Interiors (Sacrificial).

1.03 UNIT PRICES

A. This item will be measured and paid for as a lump sum item for the
job.

B. Payment will be full compensation for all labor, equipment, materials
and supervision for the installation of the cathodic protection system,
complete in place including rectifier systems with deep anode groundbed
and junction boxes, reference cells, power feed hookups, and all excavation,
drilling, backfill, field welding, connections, adjustments, testing,
cleanup, and other related work necessary for construction as shown
on the drawings and specified herein.

1.04 REFERENCES

A. ASTM C 94 - Ready Mixed Concrete.

B. ASTM D 1248 - Polyethylene Plastics Molding and Extrusion Material.

C. ASTM A 518 Standard Specification for Corrosion-Resistant
High-Silicon Iron Casting

ASTM D 42</span><span class="Normal--Char" style=" font-size: 12pt;
">39 Standard Test Methods
for Sulfur in the Analysis Sample of Coal and Coke using High Temperature
Tube Furnace Combustion Methods

E. ASTM D 5192 Standard Practice for Collection of Coal Samples from
Core

F. NEC 70 - National Electrical Code

G. City of Houston Electrical Code

H. NACE RP-0193 - External Cathodic Protection of On-Grade Metallic
Storage Tank Bottoms

I. NACE RP-0169 - Recommended Practice, Control of External Corrosion
on Underground or Submerged Metallic Piping Systems

J. NACE RP-0572 - Recommended Practice for Design, Installation, Operation
and Maintenance of Impressed Current Deep Groundbeds

K. NEMA TC6 - PVC and ABS Plastic Utilities Duct for Underground Installation

L. NEMA TC9 - Fittings for ABS and PVC Plastic Utilities Duct for Underground
Installation

M. NEMA 4 - Type 3R Enclosures

N. UL 83 - Thermoplastic-Insulated Wires

O. UL 467 - Bonding and Grounding Equipment

P. UL 486A - Wire
Connectors and Soldering Lugs for Use with Copper Conductors

1.05 SUBMITTALS

A. General: Submittals to conform to the requirements of Section 01330
- Submittals.

B. Design Drawings and Computations: Prepare by or under the direct
supervision of a Corrosion Engineer who is a Professional Engineer,
registered in the State of Texas with a minimum of ten years experience
in cathodic protection design.

C. Catalog Cuts: Submit manufacturer's catalog cuts for each item.
Include the manufacturer's name on the catalog cuts. Provide sufficient
information to show that the materials meet the requirements of the
drawings and specifications.  Where more than one item or catalog
number appears on a catalog cut, clearly identify the item proposed.

D. Logs:  Give the City of Houston representative a minimum of
48 hours notice prior to drilling the anode bore. Type and submit to
the City of Houston representative, copies of detailed geological and
resistance logs of each deep anode bore.

E. Rectifier Operation and Maintenance Manual: The rectifier manufacturer
to include a complete operation and maintenance manual with each rectifier
shipped to the job site.  In addition to operating instructions,
include a circuit diagram and spare parts list in the manual. 
Operate the rectifier under full load conditions at the factory and
thoroughly inspect and test by the manufacturer prior to delivery to
the job site.  Report results of this testing on a manufacturers
quality control form and include in the operation manual.  The
rectifier manufacturer to reference each operating manual by rectifier
model number and individual serial number.

F. Operating and Maintenance Manual: Submit six (6) operating, monitoring
and maintenance manuals for the cathodic protection systems.  The
manuals shall include operating instructions, maintenance data, product
data and test procedures.

G. Drawings: Maintain as-built drawings of the corrosion control system
during installation and construction.  Revise drawings to show
exact locations of all wiring, connections and terminal boxes. 
Properly identify all items of equipment and material. Submit the original
as-built drawings to the City of Houston representative.

1.06 QUALITY CONTROL

A. Certification: Provide manufacturer's certifications that all components
of the cathodic protection systems meet the requirements of the drawings
and specifications. Reference the applicable section of the specifications
and the applicable standard details on the certification.

B. Drawings: The drawings for the