FFZ75-3.5 Diverter Parts

1

Bonnet

H06.02C.00

Forged alloy steel (42CrMo), API 16A

1. Deformation from uneven pressure; 2. Corrosion from wellbore fluids.

1. Ensure uniform torque during assembly; 2. Apply anti-corrosion coating post-maintenance.

2

Piston

H06.08C.00

Hard chrome-plated carbon steel (45#), GB/T 1184-1996

1. Scratching from contaminated fluids; 2. Wear at seal contact surfaces.

1. Filter wellbore fluids to remove solids; 2. Inspect surface finish monthly for scratches.

3

Sleeve

H06.09C.00

Alloy steel (35CrMo), heat-treated

1. Wear from piston reciprocation; 2. Fatigue cracking from cyclic pressure.

1. Maintain proper piston-sleeve clearance; 2. Check for cracks annually via ultrasonic testing.

4

Shell

H06.01C.00

Forged steel (Q355B), pressure-tested to 5MPa

1. Impact damage during transportation; 2. Corrosion from harsh wellsite environments.

1. Use protective covers during storage; 2. Clean and inspect after exposure to saltwater.

1

O-ring

H06.04

Nitrile rubber (NBR), GB/T 3452.1-2005

1. Hardening from high temperature; 2. Extrusion from overpressure.

1. Replace every 12 months or if hardness exceeds 80 Shore A; 2. Operate within 3.5MPa rated pressure.

2

Upper Seal Ring, Piston

H06.07

Fluororubber (FKM), resistant to 200℃

1. Swelling from incompatible fluids; 2. Tearing from piston misalignment.

1. Use fluids compatible with FKM; 2. Align piston before assembly to avoid lateral force.

3

Packing Unit

H06.06

Graphite-impregnated PTFE, API 6A

1. Wear from reciprocating motion; 2. Contamination-induced abrasion.

1. Lubricate with high-temperature grease during installation; 2. Clean mating surfaces to remove debris.

4

Inside Seal Ring, Piston

H06.10

NBR, shore hardness 70±5

1. Compression set from long-term clamping; 2. Aging from UV exposure.

1. Release pressure during shutdowns; 2. Store spares in opaque, dry containers.

5

Lower Seal Ring, Piston

H06.12

NBR, oil-resistant

1. Abrasion from wear rings; 2. Cracking from low-temperature brittleness.

1. Replace worn wear rings promptly; 2. Preheat seals to 10℃+ in cold environments.

6

O-ring

H06.11

Silicone rubber, food-grade for well fluids

1. Degradation from chemical exposure; 2. Hardening from oxygen aging.

1. Inspect for discoloration monthly; 2. Apply anti-aging agent annually.

1

Wear Plate

H06.05C

Tungsten carbide-coated steel, GB/T 18376-2008

1. Abrasion from solid particles; 2. Impact damage from debris.

1. Install debris filters in fluid lines; 2. Replace if coating thickness drops below 0.5mm.

2

Lower Wear Ring, Piston

H06.08.03

Polyoxymethylene (POM), self-lubricating

1. Wear from lateral piston movement; 2. Deformation from high temperature.

1. Check piston alignment quarterly; 2. Keep operating temperature below 120℃.

3

Inside Wear Ring, Piston

H06.08.04

Nylon 66, reinforced with glass fiber

1. Abrasion from sleeve contact; 2. Cracking from impact loads.

1. Maintain 0.1~0.2mm clearance with sleeve; 2. Avoid sudden pressure surges.

4

Upper Wear Ring, Piston

H06.08.05

Polyetheretherketone (PEEK), high-strength

1. Wear from continuous reciprocation; 2. Degradation from chemical exposure.

1. Monitor wear rate monthly; 2. Use compatible wellbore treatment fluids.

1

Screw M20×55

GB/T5780-2000

Alloy steel (35CrMo), galvanized

1. Stripped threads from over-tightening; 2. Corrosion from saltwater.

1. Torque to 220~250N·m; 2. Retorque after 100 operating hours.

2

Locking Ring

H06.03C.00

Stainless steel (304), precision-machined

1. Wear from rotational adjustment; 2. Corrosion from wellbore chemicals.

1. Lubricate threads with anti-seize paste; 2. Avoid over-tightening during adjustment.

3

Z 1/2″ Hex-in Nut

2C01.36

Carbon steel (Q235), zinc-plated

1. Loosening from vibration; 2. Rust-induced seizure.

1. Use lock washers for vibration resistance; 2. Clean threads before installation.

4

Screw M16×35

GB/T5780-2000

Alloy steel (40Cr), quenched and tempered

1. Fatigue fracture from cyclic vibration; 2. Corrosion from moisture.

1. Inspect for cracks quarterly; 2. Apply anti-rust spray post-maintenance.

5

Screw M20×45

GB/T70.1-2000

High-strength steel, grade 8.8

1. Shear failure from uneven load; 2. Wear at head interface.

1. Distribute load evenly across fasteners; 2. Use socket wrenches to avoid head damage.

6

Joint (H06.13C)

H06.13C

Alloy steel, NPT thread standard

1. Thread wear from repeated assembly; 2. Leakage from thread damage.

1. Use thread sealant compatible with well fluids; 2. Avoid cross-threading during installation.

7

Z1＂Hex-out Nut

2C01.21

Carbon steel, heat-treated

1. Wear from wrench contact; 2. Corrosion from harsh environments.

1. Use properly sized wrenches; 2. Apply protective coating after installation.

8

Joint (H06.14C)

H06.14C

Stainless steel (316), corrosion-resistant

1. Pitting from chloride corrosion; 2. Wear from fluid flow.

1. Flush with fresh water after offshore use; 2. Inspect for pitting monthly.

9

Z1 1/2″ Hex-out Nut

H06.16C

Alloy steel, anti-loosening design

1. Loosening from pressure surges; 2. Thread damage from over-tightening.

1. Torque to manufacturer’s specifications; 2. Use thread protectors during storage.

10

NPT 3/4" plug

SFZ1310-01

Carbon steel, thread-sealed

1. Leakage from worn thread sealant; 2. Corrosion from moisture intrusion.

1. Replace thread sealant during each maintenance; 2. Tighten to 150~180N·m.

Are the one-year spares pre-selected for FFZ75-3.5 diverter’s regular maintenance cycle?

Yes, the one-year spares focus on high-wear seals and wear rings, which typically need replacement after 12 months of continuous operation. They align with the diverter’s maintenance schedule to minimize downtime.

Can I use alternative materials for seals and wear rings?

No, alternative materials may not withstand 3.5MPa pressure or wellbore fluid corrosion. Stick to original materials (FKM, POM, NBR) to ensure API 16A compliance and avoid catastrophic leakage.

What torque standards apply to M20 screws (GB/T5780-2000 and GB/T70.1-2000)?

For M20×55 (GB/T5780-2000) and M20×45 (GB/T70.1-2000) screws, torque to 220~250N·m per GB/T 16823.3-1997. Retorque after the first 100 operating hours to account for initial settling.