Classification & Technical Guide for HHF-1300/1600 Fluid End Parts

1

11-3161-0501-00

Cylinder assembly (3 pcs)

High-strength alloy steel (4140) with heat treatment, precision-machined inner surface for wear resistance and pressure tolerance

1. Abrasive wear from drilling mud contaminants; 2. Corrosion from chemical additives in mud; 3. Fatigue cracking from repeated pressure cycles.

1. Filter drilling mud to remove large abrasive particles; 2. Use corrosion-inhibiting additives; 3. Inspect for cracks via ultrasonic testing quarterly.

2

11-3161-0521-11 to 11-3161-0521-17

Ordinary liner (sizes: 5", 5 1/2", 6", 6 1/4", 6 1/2", 6 3/4", 7") (3 pcs)

High-chromium cast iron, designed for resistance to abrasive wear in standard drilling conditions

1. Rapid wear from high-solids mud; 2. Scoring from hard debris; 3. Thermal fatigue from temperature fluctuations.

1. Replace when wear exceeds 0.5mm; 2. Ensure proper fit with liner retainer components; 3. Maintain stable mud temperature (40-80°C).

3

11-3161-0521-21 to 11-3161-0521-26

Bi-metal liner (sizes: 5", 5 1/2", 6", 6 1/4", 6 1/2", 6 3/4")

Tungsten carbide + alloy steel bi-metal construction, enhanced wear resistance for harsh, high-abrasion mud conditions

1. Bond separation between bi-metal layers from shock loads; 2. Edge chipping from hard debris; 3. Corrosion at layer interfaces.

1. Avoid sudden pressure spikes; 2. Remove large debris from mud before entry; 3. Inspect layer bonding during routine maintenance.

4

11-3161-0515

Liner wear ring (3 pcs)

Stainless steel (304) with precision grinding, designed to reduce liner wear and maintain alignment

1. Abrasive wear from mud flow; 2. Corrosion from moisture and mud additives; 3. Deformation from improper installation.

1. Replace with liners to ensure proper fit; 2. Clean before installation to remove debris; 3. Use anti-corrosive lubricants during assembly.

5

11-3161-0516

Liner retainer ring (3 pcs)

Alloy steel (A36) with galvanized finish, designed to secure liners in place and prevent axial movement

1. Loosening from operational vibration; 2. Corrosion from drilling mud; 3. Wear from liner movement.

1. Torque retainer screws to recommended specs; 2. Inspect tightness monthly; 3. Clean and reapply anti-corrosive coating quarterly.

6

11-3161-0517-00

Liner retainer screw (3 pcs)

Steel (Grade 8) with zinc plating, medium-strength for securing liner retainer rings

1. Thread wear from vibration; 2. Corrosion from moisture and mud; 3. Shear failure from over-torquing.

1. Torque to 45 ft-lbs; 2. Apply thread sealant to prevent moisture ingress; 3. Replace if thread damage is detected.

7

11-3161-0520

Locking Ring, Liner Retainer screw (3 pcs)

Spring steel (65Mn) with heat treatment, self-locking design to prevent retainer screw loosening

1. Loss of elasticity from prolonged use; 2. Bending during installation; 3. Corrosion from mud contaminants.

1. Avoid over-stretching during installation; 2. Replace if elasticity decreases; 3. Clean before use to remove debris.

8

11-3161-0523

Splash Shield, liner (3 pcs)

Carbon steel (A1011) with epoxy coating, designed to protect liners from mud splashing and debris impact

1. Coating damage from debris impact; 2. Corrosion from mud and moisture; 3. Warping from temperature changes.

1. Install debris guards for extra protection; 2. Touch up epoxy coating annually; 3. Inspect for warping during liner replacement.

1

11-3161-0518

Piston rod (3 pcs)

Alloy steel (4340) with chrome plating, high tensile strength and wear resistance for transmitting linear motion

1. Rod surface scoring from debris; 2. Chrome plating wear from misalignment; 3. Fatigue cracking from repeated motion cycles.

1. Polish rod surface if minor scoring occurs; 2. Ensure alignment with crosshead assembly; 3. Conduct magnetic particle testing for cracks bi-annually.

2

11-3161-0524-00

Piston (3 pcs)

Nitrile rubber (NBR) with steel core, designed to seal and compress drilling mud in the cylinder

1. Rubber degradation from chemical mud additives; 2. Wear from abrasive mud; 3. Core separation from pressure spikes.

1. Use mud additives compatible with NBR; 2. Replace pistons every 1,000 operating hours; 3. Avoid sudden pressure increases.

3

11-3161-0531

Seal ring, piston (3 pcs)

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Thermal degradation from high temperatures; 2. Wear from abrasive mud; 3. Compression set from prolonged pressure.

1. Maintain operating temps below 150°C; 2. Replace with pistons to ensure proper seal; 3. Avoid over-compressing during installation.

4

11-3161-0522-00

Clamp assembly, piston rod (3 pcs)

Alloy steel (4140) with heat treatment, designed to secure the piston to the rod

1. Loosening from vibration; 2. Wear from piston movement; 3. Corrosion from mud and moisture.

1. Torque clamps to manufacturer specs; 2. Inspect tightness monthly; 3. Apply anti-corrosive sealant to clamp surfaces.

5

11-3161-0532-00

Nut, piston (3 pcs)

Alloy steel (Grade 10) with nylon insert, self-locking design to secure pistons

1. Nylon insert degradation from high temps; 2. Thread wear from repeated installation; 3. Loss of locking capability from over-torquing.

1. Replace nuts if nylon insert loses elasticity; 2. Torque to 60 ft-lbs; 3. Do not reuse nuts more than 3 times.

1

11-3161-0511-00

Valve assembly (6 pcs)

Stainless steel (316) valve body with ceramic seat, designed for corrosion resistance and precise flow control

1. Seat wear from abrasive mud; 2. Valve sticking from mud buildup; 3. Corrosion from chemical additives.

1. Clean valves during routine maintenance; 2. Replace ceramic seats when wear is detected; 3. Use compatible mud additives.

2

11-3161-0510

Valve spring (6 pcs)

Spring steel (65Mn) with heat treatment, designed to maintain valve closure and regulate flow

1. Fatigue failure from repeated compression cycles; 2. Corrosion from moisture and mud; 3. Deformation from overloading.

1. Replace springs every 1,500 operating hours; 2. Use moisture-inhibiting lubricants; 3. Inspect for deformation monthly.

3

11-3161-0505-00

Guide, valve lower (3 pcs)

Alloy steel (A36) with precision machining, designed to guide lower valve movement

1. Wear from valve movement; 2. Corrosion from mud and moisture; 3. Scoring from debris.

1. Lubricate guides with high-temperature grease; 2. Clean debris from guide channels; 3. Replace if wear exceeds 0.3mm.

4

11-3161-0527

Guide, valve (upper) (3 pcs)

Alloy steel (A36) with precision machining, designed to guide upper valve movement

1. Wear from valve movement; 2. Corrosion from mud and moisture; 3. Scoring from debris.

1. Lubricate guides with high-temperature grease; 2. Clean debris from guide channels; 3. Replace if wear exceeds 0.3mm.

5

11-3161-0513

Valve cover (3 pcs)

Carbon steel (A105) with anti-rust coating, designed to protect valve components

1. Corrosion from outdoor exposure; 2. Warping from uneven torque; 3. Damage from debris impact.

1. Torque fasteners evenly; 2. Reapply anti-rust coating annually; 3. Install protective guards to prevent impact.

6

11-3161-0512

Seal ring, valve cover (3 pcs)

PTFE (Teflon) with glass fiber reinforcement, high-pressure sealing for valve covers

1. Creep deformation from prolonged pressure; 2. Damage from sharp mating surfaces; 3. Degradation from high temperatures.

1. Inspect mating surfaces for sharp edges; 2. Avoid over-torquing; 3. Replace with each cover removal.

7

11-3161-0541-00

Spring guide (3 pcs)

Stainless steel (304), designed to guide valve springs and prevent lateral movement

1. Wear from spring movement; 2. Corrosion from moisture; 3. Bending from spring misalignment.

1. Ensure spring alignment during installation; 2. Clean and lubricate guides regularly; 3. Replace if bending or corrosion is detected.

1

11-3161-0509

Discharge manifold (1 pc)

Alloy steel (4140) with heat treatment, designed to handle high-pressure mud discharge and distribute flow

1. Corrosion from drilling mud; 2. Fatigue cracking from pressure surges; 3. Wear from abrasive mud flow.

1. Inspect for cracks via ultrasonic testing annually; 2. Use corrosion-inhibiting mud additives; 3. Install a pressure relief valve to prevent surges.

2

11-3161-0525-00

Suction manifold (1 pc)

Alloy steel (4140) with heat treatment, designed to collect and distribute incoming mud to cylinders

1. Abrasive wear from high mud flow; 2. Corrosion from moisture and mud additives; 3. Clogging from debris buildup.

1. Clean manifold regularly to remove debris; 2. Filter incoming mud; 3. Reapply anti-corrosive coating annually.

3

11-3161-0533-00

Suction damper (1 pc)

Steel housing with rubber diaphragm, designed to reduce pressure fluctuations in the suction line

1. Diaphragm degradation from chemical mud; 2. Housing corrosion from moisture; 3. Diaphragm rupture from pressure spikes.

1. Replace diaphragm every 2,000 operating hours; 2. Use compatible mud chemicals; 3. Monitor suction pressure to avoid spikes.

4

11-3161-0534

Suction flange（Ⅰ）(1 pc)

Carbon steel (A105) with galvanized finish, designed to connect the suction manifold to the mud supply line

1. Bolt hole wear from repeated assembly; 2. Corrosion from outdoor exposure; 3. Leakage from gasket failure.

1. Torque bolts evenly; 2. Replace gaskets regularly; 3. Apply anti-corrosive spray to flange surfaces.

5

11-3161-0535

Suction flange（Ⅱ）(1 pc)

Carbon steel (A105) with galvanized finish, designed to connect the suction manifold to the mud supply line

1. Bolt hole wear from repeated assembly; 2. Corrosion from outdoor exposure; 3. Leakage from gasket failure.

1. Torque bolts evenly; 2. Replace gaskets regularly; 3. Apply anti-corrosive spray to flange surfaces.

6

11-3161-0519-00

Spraying pipe assembly (1 pc)

Stainless steel (304), designed to distribute lubricant or cooling fluid to critical fluid end components

1. Clogging from debris; 2. Corrosion from moisture; 3. Leakage from joint failure.

1. Clean spray nozzles monthly; 2. Flush the assembly during lubricant changes; 3. Inspect joints for leaks regularly.

7

11-3161-0536

Screw plug, NPT1 1/2 (1 pc)

Brass (C36000), designed to seal manifold openings for maintenance

1. Thread wear from repeated removal; 2. Corrosion from mud and moisture; 3. Leakage from improper sealing.

1. Use thread sealant during installation; 2. Avoid over-tightening; 3. Replace if threads are damaged.

8

11-3161-0538

Plug, suction let, 12" (1 pc)

Alloy steel (A36) with anti-rust coating, designed to seal the suction port when not in use

1. Corrosion from outdoor exposure; 2. Wear from repeated installation; 3. Leakage from gasket failure.

1. Apply anti-corrosive coating annually; 2. Replace gaskets with each use; 3. Secure tightly to prevent debris entry.

9

11-3161-0539

Closure plate, discharge let, 5 1/8" (1 pc)

Alloy steel (A36) with anti-rust coating, designed to seal the discharge port when not in use

1. Corrosion from outdoor exposure; 2. Warping from pressure; 3. Leakage from improper seating.

1. Inspect for warping before installation; 2. Torque fasteners evenly; 3. Reapply anti-rust coating annually.

1

B34521-095-530-69

O ring, 95*5.3 G (3 pcs)

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Compression set from prolonged pressure; 2. Degradation from chemical mud; 3. Cracking from thermal cycling.

1. Replace after each disassembly; 2. Use compatible mud additives; 3. Avoid sudden temperature changes.

2

B34521-200-700-69

O ring, 200*7.0 G (3 pcs)

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Compression set from prolonged pressure; 2. Degradation from chemical mud; 3. Cracking from thermal cycling.

1. Replace after each disassembly; 2. Use compatible mud additives; 3. Avoid sudden temperature changes.

3

B34521-190-700-69

O ring, 190*7.0 G (3 pcs)

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Compression set from prolonged pressure; 2. Degradation from chemical mud; 3. Cracking from thermal cycling.

1. Replace after each disassembly; 2. Use compatible mud additives; 3. Avoid sudden temperature changes.

4

B34521-345-700-69

O ring, 345*7.0 G (3 pcs)

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Compression set from prolonged pressure; 2. Degradation from chemical mud; 3. Cracking from thermal cycling.

1. Replace after each disassembly; 2. Use compatible mud additives; 3. Avoid sudden temperature changes.

5

11-3161-0508

Seal ring, cylinder cover (3 pcs)

PTFE (Teflon) with glass fiber reinforcement, high-pressure sealing for cylinder covers

1. Creep deformation from pressure; 2. Damage from sharp mating surfaces; 3. Degradation from high temperatures.

1. Inspect mating surfaces for sharp edges; 2. Avoid over-torquing; 3. Replace with each cover removal.

6

11-3161-0514

Seal ring, liner (6 pcs)

Nitrile rubber (NBR) with fiber reinforcement, oil and mud-resistant sealing for liners

1. Wear from liner movement; 2. Degradation from mud chemicals; 3. Tear from improper installation.

1. Replace with liners; 2. Use compatible mud additives; 3. Avoid stretching during installation.

7

11-3161-0546

Sealant (As required)

High-temperature, chemical-resistant silicone sealant, designed for leak-proof sealing of fluid end components

1. Degradation from high temperatures; 2. Loss of adhesion from contaminated surfaces; 3. Cracking from thermal cycling.

1. Apply to clean, dry surfaces; 2. Avoid temps above 200°C; 3. Allow full curing (24 hours) before startup.

1

11-3161-0528, 11-3161-0501-02, 11-3161-0501-03, 11-3161-0501-05, 11-3161-0501-07

Studs (1 1/2-8UN-2A*265, 1-8UNC-2A*185, 1 1/2-8UN-2A*170, 1 1/2-8UN-2A*120, 1 1/4-8UN-2A*195)

Alloy steel (Grade 10.9/12.9) with cadmium plating, high-strength for securing heavy fluid end components

1. Fatigue failure from vibration; 2. Thread wear from repeated installation; 3. Plating damage leading to corrosion.

1. Torque to specs (150-250 ft-lbs based on size); 2. Use thread lubricant; 3. Replace if plating or threads are damaged.

2

11-3161-0501-06, 11-3161-0543, 11-3161-0501-08

Nuts (1 1/2-8UN-2B, 1 1/16-8UN-2B, 1 1/4-8UN-2B) (SPL)

Alloy steel (Grade 10) with nylon insert or galvanized finish, self-locking for vibration resistance

1. Loss of locking capability from over-torquing; 2. Thread wear from vibration; 3. Corrosion from moisture.

1. Replace nuts if locking feature fails; 2. Torque to match studs; 3. Apply anti-corrosive sealant to threads.

3

11-3161-0524, 11-3161-0544, 11-3161-0530

Bolts (7/8-9UNC-2A*60, 1 1/16-8UN-2A*90, 3/8-16UNC-2A*20)

Steel (Grade 8/10.9) with zinc or cadmium plating, medium to high-strength for securing covers and brackets

1. Corrosion from mud and moisture; 2. Thread wear from vibration; 3. Head damage from improper tool use.

1. Torque to specs (35-180 ft-lbs based on size); 2. Use matching socket wrenches; 3. Apply anti-corrosive spray.

4

11-3161-0540

Washer, 39 (30 pcs)

Steel (A36) with zinc plating, designed to distribute bolt pressure and prevent surface damage

1. Plating wear leading to corrosion; 2. Deformation from excessive pressure; 3. Misalignment causing uneven load.

1. Replace washers when plating is worn; 2. Ensure alignment with bolts; 3. Use washers matching bolt size.

5

11-3161-0507

Positioning panel (3 pcs)

Alloy steel (A36) with precision machining, designed to align fluid end components

1. Wear from component movement; 2. Corrosion from moisture; 3. Deformation from improper installation.

1. Ensure proper alignment during assembly; 2. Clean and lubricate contact surfaces; 3. Replace if deformation is detected.

6

11-3161-0504-00

Spacer assembly (3 pcs)

Stainless steel (304) with precise thickness, designed to adjust component spacing and alignment

1. Bending from improper installation; 2. Corrosion from moisture; 3. Wear from component movement.

1. Handle carefully to avoid bending; 2. Use multiple thin spacers for precise alignment; 3. Replace if corrosion is present.

7

11-3161-0506-00

Plug, cylinder cover (3 pcs)

Brass (C36000), designed to seal cylinder cover openings for maintenance or pressure relief

1. Thread wear from repeated removal; 2. Corrosion from mud; 3. Leakage from improper sealing.

1. Use thread sealant during installation; 2. Avoid over-tightening; 3. Replace if threads are damaged.

8

11-3161-0526-00

Shim (4 pcs)

Stainless steel (301) with precise thickness, designed to adjust component alignment and clearance

1. Bending from over-tightening; 2. Corrosion from lubricant contaminants; 3. Wear from component movement.

1. Use shims to achieve proper clearance; 2. Avoid over-torquing fasteners; 3. Replace if bent or corroded.

9

11-3161-0529

Baffle (3 pcs)

Carbon steel (A36) with galvanized finish, designed to direct mud flow and prevent debris buildup

1. Corrosion from mud and moisture; 2. Erosion from high mud flow; 3. Impact damage from debris.

1. Clean baffles during routine maintenance; 2. Reapply anti-corrosive coating quarterly; 3. Install debris guards.

10

11-3161-0545

Steel wire, Φ1.60 （L=1830）(1 pc)

Stainless steel (304) with high tensile strength, designed to secure fasteners and prevent loosening

1. Fatigue failure from vibration; 2. Corrosion from moisture; 3. Breakage from improper tension.

1. Apply proper tension during installation; 2. Inspect monthly for fatigue; 3. Replace annually.

How often should pistons and piston seals be replaced in the HHF-1300/1600 fluid end?

Replace pistons and piston seals every 1,000 operating hours for standard drilling conditions; reduce to 750 hours for high-abrasion mud. Inspect weekly for leakage or wear, and replace immediately if damage is detected to comply with API 610 standards.

What’s the difference between ordinary and bi-metal liners, and when to use each?

Ordinary liners (high-chromium cast iron) work for standard, low-abrasion mud. Bi-metal liners (tungsten carbide + alloy steel) offer enhanced wear resistance for harsh, high-solids mud. Use bi-metal liners in offshore or heavy-duty drilling to extend service life by 2-3x.

How to prevent bolt/nut loosening in the fluid end’s high-vibration environment?

Use self-locking nuts with nylon inserts, apply thread locker (11-3161-0546), and torque fasteners to ASME B18.2.1 specs. Retighten critical studs/bolts monthly, replace worn fasteners, and use stainless steel locking wire for high-stress components to prevent vibration-induced loosening.