Tuesday, 1 September 2020

RIG INSPECTION GUIDELINES | BOP STACK ACCEPTANCE PRESSURE & FUNCTION TESTS

BOP Stack Function and Pressure Tests For Rig Acceptance

rig accepting bop stack

Purpose of BOP Stack Function and Pressure Tests

1. Verify the hydraulic integrity of all the components of the BOP stack at their rated working
pressure.

BOP Stack Function and Pressure Tests Hints:

  • The BOP stack, choke and kill lines shall be flushed with water prior to testing (for subsea BOP stack, after the first installation, the tests may be performed using the actual fluid in hole). If a heavy mud, loaded with large amounts of solids is used, particular care in flushing of lines and valves is required. 
  • All pressure tests shall be performed using clean water. For surface equipment, all valves situated downstream of the valve or the sealing element being tested shall be in the open position.  
  • Testing area shall be clearly marked and kept free from un-necessary personnel. 
  • Pressure test of the BOP equipment shall be performed at low and high pressure. The low-pressure test shall be performed first at 250 psi (17.5 kg/cm2 – 1724 kPa) for about 5 min. before proceeding with the high pressure test. Never perform a low pressure test after a high pressure since this may lead to misinterpretation of the low pressure test results. 
  • The wear bushing shall be removed prior to perform a BOP pressure test (it may not be not required for subsea wellheads). 
  • Pipe rams – especially the variable bore rams (VBR) - and annular type preventers may be damaged if they are activated without pipe across the stack. Resulting in the extrusion of the rubber packing elements. Therefore, testing of these elements shall be conducted by closing rams and annular packing on appropriate pipe size only.  

BOP Stack Function and Pressure Tests Procedures :


  1. Test to be performed on stump and using water; use specific BOP hydraulic test unit if available, or cementing unit.
  2. For each sealing element, both low and high pressure test shall be performed, holding the pressure for about ten minutes.
  3. The high pressure test can be considered acceptable if in ten minutes result a pressure drop less than 100 PSI.
  4. You can use below table to help you in your report.


bop pressure test table

BOP Function Test

Function test all the BOP stack functions

  1. Function test for Upper annular 
  2. Function test for Lower annular 
  3. Function test for Blind/ Shear Rams 
  4. Function test for Pipe Rams 
  5. Function test for Inner up. Choke valve 
  6. Function test for Outer up. Choke valve 
  7. Function test for Inner up. Kill valve 
  8. Function test for Outer up. Kill valve 
  9. Function test for Inner lo. Choke valve 
  10. Function test for Outer lo. Choke valve 
  11. Function test for Inner lo. Kill valve 
  12. Function test for Outer lo. Kill valve  

BOP Function Test

Checklist To Be Used While Rig Accepting BOP Stack

Annular Preventer


  • Serial number: 
  • Size, make and type as per contract 
  • Date of last annular packer installation 

Single RAM Preventer


  • Serial number: 
  • Type and equipment as per contract 
  • Date of last general overhaul Rams size installed 

Double RAM Preventer


  • Serial number: 
  • Type and equipment as per contract 
  • Date of last general overhaul Rams size installed 

BOP Drilling Spool 


  • Number and size as per contract 

Adapter Spools to connect  BOP with W.H. 


  • Number and size as per contract 

KILL & CHOKE Valves On BOP stack


  • Kill valves as per contract:
  • Choke valves as per contract: 

KILL & CHOKE Lines. 


  • Kill lines dimension as per contract
  • connected as per contractual drawing  
  • dimension as per contract. 
  • Choke lines dimension as per contract

OTHER ITEMS

  1. H2S monitor sensor heads at top of bell nipple, in the flow line
  2. One combustible gas detector installed, with the sensor at either the top of the bell nipple (or the flow line opening to the shale shaker if a rotating head is in use) 
  3. BOP scaffolding or working platforms in good condition
  4. BOP ram locks are in working condition and the operating handles are in place (API RP 53)
  5. The safe working load is clearly marked on the trolley beams of BOP handling equipment
  6. HCR remote valves are provided with a hand wheel as mechanical over-ride enabling the crew to  close the valve manually 
  7. BOP (Coflexip) hoses are fire resistant
  8. Fall arrestor devices available, inspected and properly stored
  9. Kill and choke lines of proper size and pressure rating as per spec’s and fire resistant
  10. All electrical junction boxes and conduit sealed
  11. Electrical equipment and cables in good condition and explosion proof
  12. Lights with protective covers and explosion proof
  13. All pins and safety pins in place

Disqus Comments

Follow by Email