C.P. Corrosion Protection

"C.P.", manufacturer of non corrosive curb, valve, and drip boxes, has serviced the public utilities for over 32 years. This web page by Farwest features C.P.’s line of corrosion protection test stations. C.P. has been a pioneer in this field, manufacturing both standard test and custom test stations to meet specific requirements.

Many millions of dollars are spent annually by gas, electric, telephone and water utilities to protect underground metallic structures against corrosion. The C.P. Test Box is the hub of the entire cathodic protected system.

Cathodic protection, in effect, is only as good as the Test Box. You will find that C.P.’s test stations will meet the most stringent standards. They are time tested by some of the largest utilities in the United States.

Since cathodic protection is so essential today to maintain old installations, protect new ones against future corrosion, and, in particular, protect additions of new pipe lines to old, it follows that protection and accessibility are key features of the program. C.P. installations will provide these essentials as well as extra dependable features to insure long life. This is the pivotal part of the corrosion protection system.

Exclusive C.P. Test Station Features

• Non-corrosive, strong, durable ABS plastic
• Lightweight, easy to handle and store
• Break-proof in normal use
• Heavy cast iron lid and collar to withstand abuse of heavy traffic
• Non-conductive-plastic construction eliminates electrolytic and galvanic action
• Flared design prevents dislocation and reduces strain on wires
• Terminal block prolongs life of wires by minimizing wire movement and reducing chance of wire breakage
• Terminal blocks are made of polyester laminate reinforced with fiberglass.
• Machine screws and nuts are 1/4" 20 thread nickel plated.
• Lock washers are nickel plated.

Plastic pipe, 5" I.D., 18" shaft length.

Available with 4, 5 or 7 terminals.

Heavy cast iron lids, both locking and non-locking, available.

One-inch extensions available whenever road resurfacing occurs.

Plastic pipe, 2 1/2" I.D., 18" shaft length

A 2-point terminal box is standard. The block is secured in place beneath the cover. 4 or 5-point blocks also available.

Heavy cast iron cover (locking)

2-point terminal box.

Plastic pipe, 3 1/2" I.D., also available in 4" I.D. 18" shaft length.

1. Durable cast iron cover and collar, ideal for curb installations.
2. Easy access for 5-wire terminals and constructed to accommodate pass-through studs if desired.
3. Yellow covers furnished unless otherwise specified. "C.P. TEST" imprinted on all covers.
4. Reasonable priced and versatile enough to suit most requirements.

Heavy cast iron locking covers for protection on both Mini and Glenn 4. Patented Venti cover has a pentagonal bolt cast in the center, requiring only a quarter turn for locking.

Terminal blocks are made of polyester laminate reinforced with fiberglass. Machine screws and nuts are 1/4" x 20 thread nickel plated. Lockwashers are nickel plated. Lightning gap type arresters can be set for a gap distance from 4 to 40 mils. Brass shorting straps supplied are approximately 40 mils thick and can be used as a gauge for setting gap distances.

Glossary of Terms for Underground Corrosion

• Anode: A piece of metal, carbon or other conductor which loses or discharges current to a surrounding electrolyte.
• Lead: Length of wire used to complete a circuit from anode to pipe.
• Test Lead: A wire attached to a pipe for testing its potential to soil or its current.
• IR Drop: Voltage drop or resistance due to a current flow.
• Insulated: Separated by some material which is a very poor conductor.
• Potential E: A term specifying the driving force of an electrical circuit, commonly expressed in Volts. Analogous to pump horsepower in pipeline work.
• Cathodic Protection: A method of reducing or preventing corrosion of metallic structures by so impressing potentials on them as to make them cathodic throughout with respect to surrounding electrolyte.