Crown Block - Traveling Block maintenance

Care and maintenance Of Crown Traveling Block Top Drive Rotary
#Rig_Inspection_Workshop
Crown block checklist:
• Take out a permit to work (PTW).
• Hang off the blocks prior to inspection and isolate the drawworks electrical or mechanical power supply (either the SCRs or the VFDs).
• Use sheave gauges of the correct size to check the sheave profiles.
• Ensure that the five-yearly NDT inspection and disassembly are as per API RP 8B: Table 1 and ISO 13534 (or an acceptable alternative).
• Carry out a wobble test with a small crowbar to check the wear on the sheave boss and the sheave bearings.
• Check the NDT reports for the support frame.
• Confirm that the grease lines and fittings are in good condition.
• Check the condition of the omnidirectional aircraft-warning light.
• Ensure that the crown platform entrance is fitted with a self-closing door or a self-closing barrier.
• Verify that at least three jumper bars are installed over the sheave cluster, the single sheaves (if present) and the older style deadline anchor.
• Check that excess grease/tar build-up is removed from under the sheaves.
• Ensure that the wooden or rubber bumper blocks (if fitted) are covered with heavy-duty wire mesh and that this mesh has a safety wire as recommended by API RP 54 Section 9.2.

Travelling block checklist :
• Take out a PTW (permit to work).
• Hang off the travelling block prior to inspection and isolate the drawworks electrical or mechanical power supply (either the SCRs or the VFDs).
• Use sheave gauges of the correct size to check the sheave profiles
• Check that the five-yearly NDT inspection and disassembly are as per API RP 8B: Table 1 and ISO 13534 (or an acceptable alternative).
• Carry out a wobble test on the sheaves using a small crowbar.
• Review the records and/or measure the sheaves with the correct size of sheave gauge.
• Confirm that the grease fittings are in good working condition.
• Ensure that a certified hang-off line, pad eyes and shackle s are used (API RP 9A and 9B [2002] Section 3 and API RP 4G [2004] Section 8.3). Check that the load rating of the hang- off lines, pad eyes and shackles is rated to the travelling block weight, including the top drive.
• Check for damage on the sheave covers due to a twisted drill line or too high a fleet angle of the drill line. If the travelling block is not hanging straight (when no top drive is used) the drill line may be installed incorrectly. (Some workover rigs have the crown installed diagonally across the crown)
• Ensure that travelling blocks in long-term storage are kept in a vertical position.