Process for preparing pipe sections of pipeline for mechanical press fit pipe joints
Processes and systems for preparing sections of pipeline pipe for machine processing to form pin and box ends for assembly into pipelines using mechanical press-fit pipe joints. The prepared pipe sections are prepared to be fully measured and documented during both manufacturing and assembly. Installed pipelines include pipeline data monitoring systems coupled to a pipeline data management center for receiving, archiving, and analysis of the data records to aid in administration, operation and management, and troubleshooting of pipelines.
1. A process for preparing pipe sections for forming first and second ends of the pipe sections into pin and box configurations to enable formation of mechanical press-fit pipe joints in a pipeline, comprising the steps of:
inspecting raw pipe sections for acceptance into pre-preparation processing;
beveling, to a predetermined angle in an outward profile, an inside edge of one end of a pipe section to be formed with a pin end configuration;
bypassing the previous step if the end of the pipe section is to be formed with a box end configuration;
cleaning the inner and outer surfaces of the first and second ends of the pipe section such that average surface roughness R a does not exceed 1 to 3 mil;
forming, in an end prep machine configured to sense hydraulic pressure P and stroke length L, a pin end or a box end of a pipe section while measuring sensed values of P and L;
ending the forming step when the sensed values of P and L both occur within a displayed acceptance window defined by predetermined tolerances;
applying a corrosion inhibitor to the cleaned inner and outer surfaces of the pipe section; and
transferring the prepared pipe section to a storage location or to an end-forming location to enable formation of the mechanical press-fit pipe joints for use in the pipeline.
2. The process of claim 1 , wherein the step of inspecting comprises the steps of:
sorting raw pipe sections for suitability to form a pin end profile on one end of each pipe section;
selecting the one end of each pipe section to be beveled; and
rejecting a one end of a pipe section that cannot be beveled within the predetermined angle.
3. The process of claim 1 , wherein the step of beveling an inside edge of the one end of a pipe section to the predetermined angle in an outward profile comprises the step of:
machining the inside edge of the one end of the pipe section to an angle relative to the longitudinal axis of the pipe section of approximately 8 degrees from a distance of approximately 1.0 inch from the one end of the pipe section.
4. The process of claim 1 , wherein the step of cleaning comprises the steps of:
pre-heating the pipe section to remove any contaminating residue; and
finishing the surfaces of the pipe to t average surface roughness R a using a sand blasting, honing, or wire brush process.
5. The process of claim 1 , wherein the average surface roughness R a is defined as the average value of the peak-to-peak surface variation.
6. The process of claim 1 , wherein the step of applying a corrosion inhibitor comprises the step of:
applying a coating of corrosion inhibitor formulated from materials selected from the group consisting of a solvent base or a mineral oil base coating, a coating of liquid epoxy sprayed over a primer coating applied to the surfaces of the pipe, and a layer of powdered epoxy sprayed on the surfaces of the pipe after heating the pipe to a predetermined temperature.
7. The process of claim 1 , further comprising the step of:
defining a space for marking each end of each pipe section with a permanent readable imprint code that includes data positions for hydraulic pressure P data and stroke length L data to be measured during a forming or assembling process and entered in the data positions at each end of the pipe section.
8. The process of claim 7 , wherein the step of defining comprises the steps of:
marking the data positions for hydraulic pressure P data and stroke length L; and
marking, in the defined space, encoded information selected from the group consisting of pipe specifications, mill certifications, date, time, and location of processing facility.
9. The process of claim 8 , wherein the step of marking encoded information comprises the step of:
imprinting encoded information in a form selected from the group consisting of a bar code, a two-dimensional bar code, and an alpha-numeric code.
10. The process of claim 8 , wherein the step of marking encoded information comprises the step of:
imprinting encoded information by a process selected from the group consisting of dot peening, die stamping, and etching.