Electrical Division
Combination Phase Converter/ Motor Controller
Power Factor Improvement Capacitors
Threaded Pipe Nipple Division
Anodeless Risers
Willett manufactures a coated steel Anodeless Riser for gas meter installations.
Standards and Specifications
This specification covers the standards and materials of the Willett coated anodeless riser steel casing pipe. The casing is used to shield a polyethylene pipe which carries natural gas. The shielding provides protection from ultraviolet deterioration and mechanical damage where the polyethylene pipe comes above ground. The external coating is holiday free with the consideration that no cathodic protection will be provided. The coating is flexible for bending the casing pipe, while durable enough to withstand outdoor storage and a certain amount of mechanical damage.
Applicable Standards
The following standards were used as reference in the development
of the Willett riser.
(1) ANSI B1.20.1 Pipe Threads, General Purpose
(2) CSA Z184 Gas Pipeline Systems
(3) CSA Z245.1 Steel Line Pipe
(4) NACE Standard RP-02-75 Recommended Practice for Application of Organic Coatings to the External Surface of Steel Pipe for Underground Service.
(5) NACE Standard RP-02-74 Recommended Practice for High Voltage Electrical Inspection of Pipeline Coating.
(6) NACE Standard TM-01-70 Test Method for Visual Standard for Surfaces of New Steel Air Blast Cleaned with Sand Abrasive.
Product and Packaging
Willett Risers will be prepared and packaged in the following manner:
(1) Cut pipe to proper length;
(2) Ream inside both ends of pipe;
(3) Thread both ends;
(4) Protect thread ends from coating process;
(5) Prepare surface and apply coating;
(6) Check coating thickness and holiday detect;
(7) Supply and install plastic thread protectors on each end;
(8) Package completed product in such a way as to eliminate contact with other pipe in the same package, i.2. wooden spacers notched to saddle the pipe.
(9) Risers are packaged one hundred (100) units per bundle.
Pipe Specifications
The steel pipe used will be ASTM A-53, Continous weld, TYPE F pipe. The inside of the pipe will be smooth, free of burrs, and the weld seam will be flush with the surface.
Cutting, Reaming and Threading
(1) The pipe will be cut into 3.0m +/- 0.2m (10 ft.+/- 0.5 ft.) lengths.
(2) Both ends of each length will be reamed on the inside. All burrs or slivers will be removed so as not to cause an injurious defect to the polyethylene gas pipe when it is inserted.
(3) Both ends of each length will be threaded in accordance with ANSI B1.20.1.
Protective Coating
Material
3M Scotchkote 215 will be used unless otherwise requested by the customer.
Surface Preparation
(1) All organic contaminants shall be removed from the surface of the steel pipe. This will be done either by sandblasting or by solvent washing.
(2) The cleaned pipe will be abrasive blasted and the surface will conform to the "white metal:" finish as per NACE visual inspection No. 1 in NACE Standard TM-01-70.
(3) The profile of the prepared surface will be a minimum of 0.04mm (1.5 mils).
(4) All dust and spent abrasive will be removed from the surface with a properly functioning vacuum system.
(5) Time between surface preparation and coating will never exceed 2 hours.
(6) Pipe will be handled at all times in such a way as to negate any contamination.
(7) Threaded ends of the pipe will be protected from the coating operation.
Coating Application
The "Gel Time" will be independently tested by the applicator from each batch of virgin material and found to be compatible within the manufacturer's recommended limits.(1) In addition to the "Gel Time" being tested on a sample from each batch of virgin material, a random sample of coating is to be applied to a separate portion of a riser casing in the same manner that is going to be applied to the whole lot of riser casings. The resulting coating layer is then to be examined. If more than 10% of the surface of the coating is rough, bubbly, or orange peel like in appearance, the batch of coating from which the sample came is to be rejected. Only batches of coating material producing coatings whose surface area is at least 90% smooth are to be used to coat riser casings that will be put into service.
(2) The coating will be applied by a method recommended by the manufacturer.
(3) The coating thickness shall be consistent on all surfaces. The coating will have a cured thickness of 0.25mm +/- 0.05mm (10 mils +/- 2 mils) for epoxy coatings.
If the coating in any area on the riser casing is found to be less than the minimum specified thickness, that area of the coating is to be recoated such that the resulting coating thickness is greater than the minimum specified thickness.
(4) The coated pipe shall not touch the first pick up roller in a time period shorter than that which will cause damage to the coating. This time is dictated by the coating material manufacturer.
(5) Sufficient time must be given before quench to allow full cure of the coating. This shall be dictated by the coating material manufacturer.
(6) Coating thickness will be tested on each pipe.
(7) The coated pipe will be holiday tested over 100% of its area and guaranteed holiday free. The voltage setting will be 1,000 volts D.C.
(8) The coating will be smooth over all areas. Any roughness or misting will be rejected. Any riser casings with more than 10% of their surface area exhibiting a rough, bubbly, or orange peel like appearance will be rejected. Riser casings that were rejected because of this are to be repaired by re-coating them with coating material that will produce a smooth, uniform surface over at least 90% of the casing.
Bending
Pipe will be shipped in straight lengths for bending at time of installation.