RongshengHBRS 2FZ35-35 Shear BOP-1

1

Assembly

FZ897.21.01.00

NBR / POM / Spring Steel

Cause: Extrusion due to excessive clearance or pressure spikes.
Prevention: Ensure gland dimensions are within API 16A tolerances before installation.

2

Top Seal (Generic)

FZ897.21.01.01

Nitrile Rubber (NBR)

Cause: Thermal degradation from high-temperature drilling fluids.
Prevention: Verify fluid compatibility; consider Viton (FKM) upgrades for high-temp wells.

1

Front Seal

RJ11148.09.01.02

Rubber Compound

Cause: Abrasive wear from sand-laden fluids or debris in the wellbore.
Prevention: Regular flushing of the BOP cavity and groove inspection for nicks is mandatory.

2

Front Seal

RJ11148.09.08.02

Cause: Swelling due to chemical incompatibility with drilling mud or kill fluid.
Prevention: Conduct chemical resistance testing of the elastomer against the specific drilling fluid in use.

3

Front Seal

RJ11148.09.02.02

Cause: Compression set; the seal fails to rebound after prolonged pressure.
Prevention: Avoid over-compression during ram closure; adhere to manufacturer torque specifications.

4

Front Seal

RJ11148.09.03.02

Cause: Spiral failure caused by misalignment of the ram blocks during closure.
Prevention: Check guide pins and bushings for wear to ensure parallel ram movement.

5

Front Seal

RJ11148.09.16.02

Cause: Erosion due to high-velocity fluid flow (chatter).
Prevention: Ensure hydraulic closing pressure is sufficient to prevent ram movement under flow.

6

Front Seal

RJ11148.09.13.02

Cause: Installation damage (nicks/cuts) from sharp edges in the groove.
Prevention: Chamfer all edges and use proper installation tools/lubricants.

7

Front Seal

RJ11148.09.04.02

Cause: Brittle fracture from exposure to H2S (Sour Service).
Prevention: For sour service, ensure materials meet NACE MR0175 standards.

8

Front Seal

RJ11148.09.05.02

Cause: Excessive friction leading to heat buildup.
Prevention: Maintain proper lubrication of the ram profile and sealing surfaces.

9

Front Seal

RJ11148.09.11.02

Cause: Incomplete sealing due to pipe ovality or wear.
Prevention: Measure pipe dimensions regularly; replace pipe if out of roundness spec.

10

Front Seal

RJ11148.09.06.02

Cause: De-bonding of bonded seals.
Prevention: Avoid thermal cycling beyond the material's glass transition temperature (Tg).

11

Front Seal

RJ11148.09.07.02

Cause: General aging and ozone cracking.
Prevention: Store spare seals in opaque, airtight containers away from UV light.

12

Front Seal

RJ11148.09.17.02

Cause: Incompatibility with water-based muds (WBM) causing excessive swell.
Prevention: Select low-swell elastomers for WBM environments.

13

Front Seal

RJ11148.09.14.02

Cause: Pinching due to incorrect gland depth.
Prevention: Verify housing and ram block dimensions during maintenance.

14

Front Seal

RJ11148.09.12.02

Cause: Vibration-induced fretting.
Prevention: Ensure hydraulic locks are engaged when the BOP is in a static position.

1

Ram Block

FZ897.21.01.03

2 3/8"

Cause: Bore wear leading to poor sealing.
Prevention: Measure bore diameter against new spec; replace if wear exceeds API limits.

2

Ram Block

FZ897.21.02.03

2 7/8"

Cause: Shear blade dulling (for shear rams).
Prevention: Inspect cutting edges regularly; perform hardness testing on drill pipe to ensure shearability.

3

Ram Block

FZ897.21.03.03

3 1/2"

Cause: Latch mechanism failure.
Prevention: Lubricate latch pins and check for spring fatigue.

4

Ram Block

FZ897.21.04.03

3 1/2" Dual

Cause: Interference between dual seals.
Prevention: Verify the correct orientation of the dual block during installation.

5

Ram Block

FZ897.21.05.03

4 1/2"

Cause: Corrosion pitting on steel components.
Prevention: Apply corrosion inhibitors and ensure proper drainage of the BOP.

6

Ram Block

FZ897.21.06.03

5"

Cause: Misalignment causing eccentric wear.
Prevention: Check the ram shaft for straightness and bearing condition.

7

Ram Block

FZ897.21.07.03

5 1/2"

Cause: Rubber tear from aggressive pipe movement.
Prevention: Minimize pipe rotation or reciprocation while the rams are closed.

8

Ram Block

FZ897.21.10.03

6 5/8"

Cause: Hydraulic fluid contamination scoring the piston.
Prevention: Maintain clean hydraulic fluid and change filters regularly.

9

Ram Block

FZ897.21.08.03

7"

Cause: Excessive closing pressure damaging the block structure.
Prevention: Calibrate the hydraulic control unit (HCU) pressure relief valves.

10

Ram Block

FZ897.21.09.03

9 5/8"

Cause: Erosion of the steel backing.
Prevention: Monitor flow rates; avoid prolonged chock-and-kill scenarios against closed rams.

11

Ram Block

FZ897.21.13.03

10 3/4"

Cause: Thermal shock cracking.
Prevention: Avoid rapid temperature changes when circulating mud.

12

Ram Block

FZ897.21.11.03

5" - 5 1/2"

Cause: Improper size selection for the pipe in the hole.
Prevention: Double-check the drill string schedule before selecting the ram block.

13

Ram Block

RS11172.16.01

2 7/8" - 5"

Cause: Complex geometry leading to debris trapping.
Prevention: Perform high-pressure water washes of the BOP bore before running rams.

1

Assembly

RS11172.16.00

General Assembly

Cause: Sub-component loosening due to vibration.
Prevention: Torque check all fasteners to API 16A standards prior to installation.

2

Ram Block

RS11172.16.01

2 7/8" - 5"

Cause: Compromise in sealing efficiency due to wide size range.
Prevention: Use dedicated single-size rams whenever possible for maximum pressure integrity.

3

Front Seal

RS11172.16.02

Seal Component

Cause: Mismatched durometer for the specific application.
Prevention: Consult the OEM manual to ensure the Shore A hardness is correct for the pressure rating.

4

Top Seal

RS11172.16.03

Seal Component

Cause: Improper gland fill causing seal explosion.
Prevention: Calculate the gland fill percentage; never exceed 100% when the seal is compressed.