Project Name
Project Number
TEMF
Statement of Work
UFC 4-214-02, 24 Jul 03
the soil resistivity.
4-22.2
Corrosion control. Mandated for all metallic underground storage tanks storing
petroleum or hazardous substance by 40 CFR, Part 280 and AR 200-1 and on hazardous liquid
pipelines (e.g., liquid fuel) by 49 CFR, Part 195.
4-22.3
Design requirements. CP systems must be designed to provide protective potential
to meet the requirements of the National Association of Corrosion Engineers (NACE) Standard
RP-0169, Control of External Corrosion on Underground or Submerged Metallic Piping
Systems, or NACE Standard RP-0185, Control of External Corrosion on Metallic Buried,
Partially Buried, or Submerged Liquid Storage Systems, as appropriate.
4-22.4
Compatibility. New or supplemental CP systems shall be compatible with existing CP
systems and other adjacent structures or components. New systems should be compatible with
existing systems to allow ease of repair and maintenance.
4-22.5
Tracer wire. When plastic pipe is used to extend a steel gas distribution main, an
insulated No. 8 AWG copper wire shall be exothermically welded to the existing steel main and
run the length of the new plastic main. This wire can be used as a locator tracer wire and to
maintain continuity to any future steel gas main extension.
4-22.6
Coatings. CP and protective coatings shall be provided for the following buried and
submerged ferrous metallic structures regardless of soil or water resistivity.
4-22.6.1
Natural gas and propane piping.
4-22.6.2
Liquid fuel piping.
4-22.6.3
Underground fuel storage tanks. Not required for those coated in accordance with
UL1746.
4-22.6.4
Fire protection piping.
4-22.6.5 Ductile or cast iron piping. Required for pressurized piping under floor (slab on
grade) in soil.
4-22.6.6 Conduit piping systems. Required for underground heat distribution and chilled water
piping in ferrous metallic conduit.
4-22.6.7 Hazardous storage structures. Structures with hazardous products as identified by
the installation.
4-22.7
Cast iron pipe. Shall be treated as follows:
4-22.7.1 Below 10,000 Ohm-cm: For soil resistivity below 10,000 Ohm-cm at pipeline
installation depth, provide CP, bonded joints, and protective coatings.
4-22.7.2 Between 10,000 and 30,000 Ohm-cm: For soil resistivity between 10,000 and 30,000
Ohm-cm at pipeline installation depth, provide bonded joints only.
4-22.8
Copper water service lines: Piping will be dielectrically isolated from ferrous pipe.
SOW-63
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