RP 16Q: Design., Selection, Operation, and Maintenance of Marine Drilling Riser Systems between successive layers. The first tier of joints should be off the ground to keep moisture and dirt away from the joints. The support shims should be spaced to prevent bending of the pipe and damage to the coupling. Joints should be stacked at a safe and accessible height, slightly inclined to assure proper drainage of water. Joints should be cleaned internally and externally, and protective coatings should be applied or touched up as necessary before storing. Riser couplings and all mating surfaces should be maintained according to manufacturer's specifications.

  1. 7.4 Transportation. When riser system components are transported, supervision should be provided at the time of loading to ensure that the load is tied down securely to prevent shifting, that painted or coated surfaces are protected from tie-down chains or straps, that guidelines for handling and storage (Section 4.7.1) are followed, that the components do not come in contact with chemicals, corrosives, bilge water, or other damaging substances, that other materials are not loaded on top of or inside the riser, and that all relevant regulations are satisfied.
  2. 8 SCHEDULED FIELD INSPECTION AND MAINTENANCE. Regularly scheduled inspection and maintenance should be performed on all riser system components. Detailed procedures should be developed for the performance of the following inspection and maintenance tasks and should be contained in the Riser Operating Manual.
  3. 8.1 Visual Inspection for Corrosion, Cracks, and Wear. After each retrieval, the marine riser joints should be visually inspected for corrosion, cracks, and wear. The box and pin of the riser connector should be cleaned thoroughly before inspection. Other critical areas, as specified by the manufacturer, should be more thoroughly checked and remedial action taken as needed.
  4. 8.2 Nondestructive Inspection. Liquid penetrant or magnetic particle inspection methods should be used to investigate critical areas for cracks. Ultrasonic or other suitable means should be used to check the main tube wall thickness. Acceptance criteria should be agreed upon between operator and drilling contractor. These inspections should be conducted at least once a year unless results of previous inspections warrant a longer inspection interval. An inspection is recommended after abnormal conditions such as over-tensioning, under-tensioning, or shock loads during running or retrieving the riser. Inspection and remedial action should be in accordance with the manufacturer's recommendations.
  5. 8.3 Corrosion Protection. The riser should be checked for areas of cracked or flaking paint. These areas should be thoroughly cleaned and repainted according to user's or manufacturer's specifications.
  6. 8.4 Parts Replacement. When replacement of moving parts in the riser system is required, it should be done in accordance with the manufacturer's recommendations. These instructions should be included in the operating manual and outlined with sufficient clarity for use by rig supervisory personnel. Reliable records of inventory and replacement requirements should be kept.

Replacement of parts should be accompanied by special attention given to cleanliness of parts, inspection for damage, assurance of correct items by part numbers, lubrication if required, correct assembly, and proper installation.

4.8.5 Welding. No welding should be performed on any riser component without first consulting with the manufacturer. Field welding should not be performed without explicit authorization from the manufacturer accompanied by approved procedures and performed by welders qualified for those procedures.

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