Drawworks Fundamentals #Rig_Inspection_Workshop

#Rig_Inspection_Workshop

Rig Drawworks Checkist :
• Record the date of the last drawworks overhaul (API RP 7L Section 4.2).
• Check the NDT inspection reports for the brake bands, linkage and equaliser bar.
• Review the wear reports for the brake bands and brake rims (IADC Drilling Manual, Chapter F).
• Check for wear on the brake linkage and look for "kicking" brakes.
• Inspect the wear on the drill line/LeBus groove.
• Ensure that at least twelve wraps of drill line are left on the brake drum, with the travelling block in the lowest position above the rotary table (check OEM for reference).
• Check the condition of the drill line clamp on the dead end of the drill line behind the brake rim flange.
• Make sure that there is enough spare drill line for the duration of the contract or well.
• Verify the kickback roller setting (⅛- to ¼-inch play).
• Carry out a cathead pull test: minimum make-up cathead 7,000 lbs line pull, and break-out cathead 14,000 lbs line pull (3,175 kg and 6,350 kg, respectively).
• Check the condition of the make-up chain (maximum allowable link wear 10%).
• Check condition of the break-out line.
• Check the foundation bolts.
• Ensure that the lubrication oil pressure is within the OEM-required range (20 to 50 psi and 1½ to 3½ bars for most common drawworks).
• Review the monthly oil-sampling analysis reports.
• Check that the oil sprayer nozzles are not blocked.
• Check if silicone sealant is being used as gasket material on the covers.
• Review the inspection records of the chain stretch: maximum allowed stretch 3% as measured over five links (API Spec 7F Section A.3.5).
• Check for wear on the sprockets (API Spec 7F Sections A.3.4 and A.3.5).
• Carry out a function test of the Crown-O-Matic or equivalent system daily and before tripping pipe
• Confirm that any DC motors used inside the hazardous area are fitted with spark arresters and EX space heaters in the event the exhaust air is vented inside the hazardous area.
• Confirm that the electric cables and junction boxes if installed inside the hazardous area have an EX rating (API RP 14F [2008] Section 6.4.7.2). (API RP 500, Fig 75)

• Ensure there is sufficient cooling-water capacity for the brake bands and the Baylor eddy current brake (minimum 150 US gallons per minute = 570 litres per minute when using a Baylor type 7838 unit).
• Ensure there is sufficient cooling water for the auxiliary disk brakes (195 gallons per minute = 740 litres per minute).

Видео Drawworks Fundamentals #Rig_Inspection_Workshop канала O&G HSE