GH3101-05.00 Fluid End Assembly for Honghua HHF-1000 Mud Pump

1

GH3101-05.01.00

Cylinder assembly

High-strength alloy steel (42CrMo), heat-treated for tensile strength (≥980MPa) and precision-machined to withstand high pressure (≥35MPa)

1. Erosion from abrasive drilling mud; 2. Corrosion from chemical additives in mud; 3. Fatigue from cyclic pressure fluctuations.

1. Inspect inner surface for erosion via borescope monthly; 2. Use mud with controlled abrasive content per API 13C; 3. Monitor pressure to avoid exceeding design limits.

2

GH3101-05.22A

Ordinary liner

Chrome-plated carbon steel (SAE 1045), with a 0.15-0.20mm chrome layer for enhanced wear resistance

1. Abrasive wear from drilling mud particles; 2. Scratching from foreign debris; 3. Thermal fatigue from rapid temperature changes.

1. Replace when inner diameter wear exceeds 0.10mm; 2. Clean cylinder bore thoroughly before installation; 3. Avoid sudden temperature spikes during operation.

3

GH3101-05.22

Double metal liner

Bimetallic composite (carbon steel base + tungsten carbide overlay), designed for extreme abrasive resistance in heavy-duty drilling

1. Delamination from improper installation; 2. Localized wear from uneven mud flow; 3. Corrosion at the metal interface.

1. Ensure proper interference fit (0.05-0.08mm) during installation; 2. Maintain uniform mud flow to avoid eddies; 3. Inspect for delamination via ultrasonic testing quarterly.

4

GH3101-05.19.00A

Piston

Elastomer (HNBR) with steel core, shore hardness 85±5, resistant to high pressure and drilling fluid chemicals

1. Wear from contact with liner inner surface; 2. Degradation from chemical additives in mud; 3. Damage from foreign debris in the cylinder.

1. Replace every 500 operating hours or if seal leakage is detected; 2. Clean liner bore before piston installation; 3. Use compatible mud additives to avoid elastomer degradation.

5

GH3101-05.21

Piston rod

Alloy steel (40CrNiMoA), precision ground with nitride hardening (surface hardness ≥60 HRC) for wear and corrosion resistance

1. Wear from seal contact; 2. Corrosion from mud leakage; 3. Bending from misalignment with crosshead.

1. Check straightness (tolerance ≤0.02mm/m) quarterly; 2. Inspect surface for scratches or corrosion monthly; 3. Ensure alignment with crosshead per API 7K Section 5.2.

1

GH3101-05.17.00

Valve assembly（API  6#）

Stainless steel (AISI 17-4 PH) valve body with tungsten carbide seat, compliant with API 6A standards for high-pressure service

1. Seat wear from abrasive mud particles; 2. Valve leakage from misalignment; 3. Fatigue from cyclic pressure loading.

1. Inspect valve seat for wear quarterly; 2. Clean valve components before reassembly; 3. Ensure proper spring tension to maintain valve closure.

2

GH3101-05.11

Valve cover

Carbon steel (SAE 1045), zinc-plated for anti-corrosion with precision-machined mating surfaces for sealing

1. Deformation from over-tightening fasteners; 2. Corrosion from mud leakage; 3. Wear from vibration-induced contact.

1. Torque fasteners uniformly to 180 ft-lbs; 2. Replace seal rings when reinstalling; 3. Inspect for cracks via dye penetrant testing semi-annually.

3

GH3101-05.12

Valve rod guide device

Bearing steel (GCr15), precision ground to ensure valve rod alignment and smooth movement

1. Wear from valve rod movement; 2. Contamination-induced abrasion; 3. Misalignment causing uneven stress.

1. Lubricate with high-temperature grease (NLGI 2) monthly; 2. Clean guide bore to remove debris; 3. Check alignment with valve rod quarterly.

4

GH3101-05.13.00

Spring guide

Carbon steel (SAE 1035), heat-treated for fatigue resistance to support valve spring operation

1. Fatigue from repeated spring compression; 2. Wear from contact with valve spring; 3. Corrosion from moisture or mud residue.

1. Inspect for cracks quarterly; 2. Replace if bent or worn; 3. Ensure proper fit with valve spring to avoid misalignment.

5

GH3101-05.27.00

Valve rod guide

Bearing steel (GCr15), identical to the valve rod guide device for consistent alignment performance

1. Same as valve rod guide device, with added stress from high-pressure fluid flow; 2. Abrasion from contaminated mud; 3. Thermal fatigue from temperature fluctuations.

1. Flush with clean oil monthly to remove debris; 2. Monitor operating temperature (≤85°C); 3. Replace if guide bore wear exceeds 0.03mm.

1

GH3101-05.08

Discharge manifold

Alloy steel (A350 LF2), forged for high-pressure resistance (≥40MPa) and compliant with ASME B16.34

1. Erosion from high-velocity mud flow; 2. Corrosion from chemical additives; 3. Fatigue from pressure surges.

1. Inspect for erosion at flow bends quarterly; 2. Install pressure dampers to reduce surges; 3. Use corrosion inhibitors in mud per API 13C.

2

GH3101-05.28.00

Suction manifold

Alloy steel (A350 LF2), forged with large bore design to minimize flow restriction and pressure loss

1. Cavitation damage from insufficient suction pressure; 2. Erosion from abrasive mud; 3. Corrosion from moisture in suction lines.

1. Maintain adequate suction pressure (≥0.2MPa) to prevent cavitation; 2. Clean manifold interior monthly to remove debris; 3. Inspect for corrosion at weld joints.

3

GH3101-05.29.00

Suction damper

Carbon steel housing with nitrile rubber bladder, designed to absorb suction pressure fluctuations

1. Bladder degradation from chemical exposure; 2. Housing corrosion from mud leakage; 3. Bladder rupture from over-pressurization.

1. Inspect bladder for cracks annually; 2. Maintain damper pressure at 0.15-0.2MPa; 3. Replace bladder if leakage is detected.

4

GH3101-05.07

Closure plate, discharge let：5 1/8"

Carbon steel (SAE 1045), precision-machined with a sealing groove for high-pressure leak prevention

1. Wear from contact with sealing components; 2. Deformation from uneven pressure; 3. Corrosion from mud leakage.

1. Replace seal rings when reinstalling; 2. Torque fasteners uniformly to avoid deformation; 3. Inspect for wear on sealing surfaces monthly.

5

GH3101-05.31

Suction flange（Ⅰ）

Carbon steel (SAE 1045), flange design per ASME B16.5 (Class 600) for secure suction line connection

1. Bolt hole wear from repeated fastening; 2. Corrosion from environmental exposure; 3. Gasket surface wear from leakage.

1. Torque bolts to 220 ft-lbs per ASME specs; 2. Inspect flange surface for scratches before installation; 3. Replace gaskets annually.

6

GH3101-05.32

Suction flange（Ⅱ）

Carbon steel (SAE 1045), identical to Suction Flange (Ⅰ) for consistent connection and sealing performance

1. Same as Suction Flange (Ⅰ), with added stress from suction pressure fluctuations; 2. Corrosion from mud residue; 3. Deformation from improper alignment.

1. Ensure alignment with suction manifold before tightening; 2. Clean flange surface to remove mud residue; 3. Use anti-seize compound on bolts for harsh environments.

7

GH3101-05.35

Plug, suction let：12"

Carbon steel (SAE 1035), with NPT thread design for secure sealing of the suction port when not in use

1. Thread wear from repeated installation/removal; 2. Corrosion from moisture; 3. Seal degradation from mud residue.

1. Apply thread sealant before installation; 2. Avoid over-tightening to prevent thread stripping; 3. Inspect threads for damage before reuse.

8

GN3101-05.33

Screw plug：NPT1 1/2

Brass (C36000), NPT thread compliant (ANSI/ASME B1.20.1) for low-pressure sealing applications

1. Thread damage from improper installation; 2. Corrosion from chemical exposure; 3. Loosening from pump vibration.

1. Use a socket wrench to avoid thread damage; 2. Apply thread sealant compatible with drilling fluids; 3. Check tightness monthly.

1

GH3101-05.02

Stick, liner cover flange

Carbon steel (SAE 1010), stamped and painted for anti-corrosion, designed to secure liner cover flanges

1. Fatigue from vibration; 2. Corrosion from environmental exposure; 3. Bending from improper handling.

1. Inspect for bending during maintenance; 2. Store in a dry area when not in use; 3. Ensure secure mounting to avoid vibration-induced damage.

2

GH3101-05.03

Stick, liner cover

Carbon steel (SAE 1010), identical to liner cover flange stick for consistent securing performance

1. Same as liner cover flange stick, with added stress from liner expansion; 2. Corrosion from mud residue; 3. Wear from repeated contact.

1. Clean mud residue from surfaces monthly; 2. Replace if bent or rusted; 3. Ensure proper alignment with liner cover.

3

GH3101-05.04

Liner locking Ring

Spring steel (65Mn), heat-treated for elasticity and wear resistance, designed to secure liners in place

1. Elastic fatigue from repeated expansion; 2. Wear from contact with liner; 3. Damage from improper installation (overstretching).

1. Use specialized pliers to avoid overstretching; 2. Inspect for cracks quarterly; 3. Replace if elasticity is reduced.

4

GH3101-05.05

Cylinder cover plug

Carbon steel (SAE 1035), zinc-plated for anti-corrosion with a precision-machined sealing surface

1. Seal degradation from mud leakage; 2. Thread wear from repeated use; 3. Corrosion from moisture.

1. Apply sealant before installation; 2. Torque to 65 ft-lbs; 3. Inspect for leaks after pump startup.

5

GH3101-05.06

Puller & pusher

Alloy steel (40Cr), heat-treated for tensile strength to assist with liner and piston installation/removal

1. Bending from improper force application; 2. Wear from contact with heavy components; 3. Corrosion from environmental exposure.

1. Apply force evenly during use; 2. Clean and oil after each use; 3. Store in a protected area to avoid damage.

6

GB/T3452.1-1992

O ring：97.5×3.55G

Nitrile rubber (NBR), shore hardness 70±5, per GB/T3452.1-1992, resistant to oil and drilling fluids

1. Degradation from chemical exposure; 2. Pinching during installation; 3. Hardening from prolonged service.

1. Replace annually or if leakage is detected; 2. Clean O-ring grooves before installation; 3. Avoid over-tightening to prevent pinching.

7

GB/T3452.1-1992

O ring：190×7.0G

Nitrile rubber (NBR), shore hardness 70±5, per GB/T3452.1-1992, for high-pressure sealing in manifold applications

1. High-pressure-induced wear; 2. Chemical degradation; 3. Damage from improper installation.

1. Verify compatibility with manifold pressure rating; 2. Replace if bulging or tearing is found; 3. Use a lubricant (compatible with NBR) during installation.

8

GB/T3452.1-1992

O ring：345×7.0G

Nitrile rubber (NBR), shore hardness 70±5, per GB/T3452.1-1992, large-size for flange and manifold sealing

1. Same as 190×7.0G O-ring, with added vulnerability to stretching during installation; 2. Corrosion from mud residue; 3. Wear from flange movement.

1. Handle carefully to avoid stretching; 2. Clean flange surfaces thoroughly; 3. Replace if O-ring diameter is distorted.

9

GH3101-05.09

Seal ring for valve cover

Nitrile rubber (NBR) with steel reinforcement, optimized for valve cover high-pressure sealing

1. Wear from valve vibration; 2. Degradation from high temperatures; 3. Damage from improper installation.

1. Replace when reinstalling valve covers; 2. Clean valve cover groove to remove debris; 3. Ensure proper fit to avoid leakage.

10

GH3101-05.10

bolt：1 1/2-8UN-2A×262

Alloy steel (12.9 grade), heat-treated for high tensile strength, UN thread per ANSI B1.1

1. Fatigue failure from high torque and vibration; 2. Thread wear from over-tightening; 3. Corrosion from environmental exposure.

1. Torque to 650 ft-lbs per API 7K specs; 2. Use calibrated torque wrenches; 3. Apply anti-seize compound for harsh environments.

11

GH3101-05.01.03

Nut：1 1/2-8UN-2B（SPL）

Alloy steel (10 grade), heat-treated with a nylon insert for self-locking, UN thread per ANSI B1.1

1. Nylon insert degradation from high temperatures; 2. Thread wear from repeated use; 3. Corrosion leading to seizing.

1. Replace if nylon insert loses elasticity; 2. Torque with matching 12.9 grade bolts; 3. Clean threads before installation.

12

GH3101-05.15

Bolt：3/8-16UNC-2A×20

Alloy steel (8.8 grade), zinc-plated, UNC thread per ANSI B1.1 for light-load fastening

1. Loosening from pump vibration; 2. Thread wear from cross-threading; 3. Corrosion from moisture.

1. Apply medium-strength thread locker (Loctite 242); 2. Torque to 45 ft-lbs; 3. Align threads properly to avoid cross-threading.

13

American standard（item 32）

Bolt：7/8-9UNC-2A×55

Alloy steel (10.9 grade), heat-treated, UNC thread per ANSI B1.1 for medium-load fastening

1. Fatigue from vibration; 2. Thread wear from over-tightening; 3. Corrosion from mud residue.

1. Torque to 280 ft-lbs; 2. Inspect threads for damage before reuse; 3. Clean mud residue from threads.

14

American standard（item 36）

Bolt：1 1/16-8UN-2A×90

Alloy steel (12.9 grade), heat-treated, UN thread per ANSI B1.1 for high-load manifold fastening

1. Fatigue from pressure-induced vibration; 2. Thread wear from repeated installation; 3. Corrosion from harsh drilling environments.

1. Torque to 420 ft-lbs; 2. Replace after 2 service cycles; 3. Apply anti-corrosion coating for outdoor use.

15

American standard（item 37）

Nut：1 1/16-8UN-2B（SPL）

Alloy steel (10 grade), heat-treated with self-locking feature, UN thread per ANSI B1.1

1. Self-locking feature degradation from high temperatures; 2. Thread wear from over-tightening; 3. Corrosion leading to seizing.

1. Replace if self-locking performance declines; 2. Use with matching 12.9 grade bolts; 3. Apply anti-seize compound to threads.

16

GB/T4240-1993

Stainless  steel  Wire  ： φ 1.60（L=1830）

Stainless steel (AISI 304), high-tensile per GB/T4240-1993, for component locking and securing

1. Fatigue from vibration; 2. Breakage from improper bending; 3. Corrosion from mud or moisture.

1. Avoid over-bending to maintain tensile strength; 2. Replace after each disassembly; 3. Ensure secure locking without contact with moving parts.

17

GH3101-05.16

Short connector

Brass (C36000), precision-machined for secure fluid line connection with leak-resistant design

1. Thread wear from repeated use; 2. Corrosion from chemical additives; 3. Loosening from pump vibration.

1. Apply thread sealant before installation; 2. Avoid over-tightening to prevent thread damage; 3. Inspect for leaks monthly.

18

GH3101-05.18.00

Piston nut

Alloy steel (10.9 grade), heat-treated with left-hand threads to prevent loosening during piston movement

1. Thread wear from piston vibration; 2. Loosening from improper torque; 3. Corrosion from mud leakage.

1. Torque to 250 ft-lbs (left-hand thread); 2. Use thread locker for added security; 3. Inspect tightness before each pump startup.

19

GH3101-05.20

Seal ring, piston

HNBR elastomer, designed for high-pressure piston sealing with resistance to drilling fluid chemicals

1. Wear from contact with liner; 2. Degradation from high temperatures; 3. Damage from foreign debris.

1. Replace with piston every 500 operating hours; 2. Clean liner bore before installation; 3. Avoid using sharp tools during installation.

20

GH3101-05.23.00

Spraying pipe assembly

Carbon steel (SAE 1010), painted for anti-corrosion, designed to distribute lubricant or cooling fluid

1. Clogging from debris in fluid; 2. Corrosion from moisture; 3. Damage from debris impact.

1. Clean spray nozzles monthly to prevent clogging; 2. Inspect for rust during maintenance; 3. Protect from debris impact during drilling.

21

GH3101-05.24.00

Clamp assembly

Carbon steel (SAE 1045), heat-treated for strength to secure manifold and fluid line connections

1. Fatigue from vibration; 2. Deformation from over-tightening; 3. Corrosion from environmental exposure.

1. Torque clamp bolts uniformly; 2. Inspect for deformation quarterly; 3. Apply anti-corrosion spray for outdoor use.

22

GH3101-05.25

Liner end cover

Carbon steel (SAE 1045), zinc-plated for anti-corrosion with a sealing groove for liner end protection

1. Wear from contact with liner; 2. Corrosion from mud leakage; 3. Deformation from uneven pressure.

1. Replace seal rings when reinstalling; 2. Torque fasteners to 90 ft-lbs; 3. Inspect for wear on sealing surfaces monthly.

23

GH3101-05.26

Fixing clamp

Carbon steel (SAE 1045), identical to clamp assembly for consistent securing performance

1. Same as clamp assembly, with added stress from liner movement; 2. Corrosion from mud residue; 3. Loosening from vibration.

1. Check tightness quarterly; 2. Clean mud residue from clamp surfaces; 3. Replace if bent or corroded.

24

GH3101-05.14

Baffle

Carbon steel (SAE 1010), stamped and painted for anti-corrosion, designed to redirect mud flow and protect components

1. Erosion from high-velocity mud; 2. Corrosion from chemical additives; 3. Damage from debris impact.

1. Inspect for erosion monthly; 2. Clean mud buildup from surfaces; 3. Replace if bent or heavily eroded.

25

GH3101-05.30.00

Shim set

Stainless steel (AISI 304), precision-cut with multiple thicknesses for fluid end alignment adjustments

1. Metal fatigue from uneven load; 2. Corrosion from moisture; 3. Damage from improper handling.

1. Replace as a full set to maintain alignment; 2. Clean mating surfaces before installation; 3. Avoid bending during handling.

26

GH3101-05.34

Washer ：39

Carbon steel (SAE 1010), zinc-plated, spring washer design per GB/T93-1987 for anti-loosening performance

1. Fatigue from vibration; 2. Deformation from over-tightening; 3. Corrosion from environmental exposure.

1. Match washer size to large-diameter bolts; 2. Replace if deformed or rusted; 3. Use under nuts to distribute clamping force.

27

277

Sealant

Anaerobic high-pressure sealant, resistant to oil, drilling fluids, and high temperatures (-55°C to 180°C)

1. Degradation from high temperatures; 2. Contamination before curing; 3. Inadequate application thickness.

1. Apply a uniform layer (0.2-0.3mm) to mating surfaces; 2. Allow 24 hours for full curing; 3. Clean surfaces thoroughly before application.

What’s the difference between ordinary and double metal liners, and when should I use each?

Ordinary liners (chrome-plated carbon steel) suit standard drilling with low-abrasive mud. Double metal liners (tungsten carbide overlay) handle extreme abrasion in heavy-duty drilling. Choose double metal liners for high-sand-content mud to extend service life.

How often should piston and piston seals be replaced?

Replace pistons and piston seals every 500 operating hours as routine maintenance. If leakage, reduced pressure, or abnormal noise is detected earlier, replace immediately to prevent further fluid end damage.

Which sealant is compatible with the fluid end assembly’s high-pressure requirements?

Use the specified 277 high-pressure anaerobic sealant, which resists drilling fluids and temperatures up to 180°C. Avoid generic sealants, as they may fail under the fluid end’s high pressure (≥35MPa) and cause costly leaks.