Piston Catalog for BOMCO Mud Pump

1

Piston AH010004-3700

Piston body: 42CrMo alloy steel (quenched and tempered, hardness HRC 32-38); Piston seal: Fluororubber (FKM, high-temperature resistant up to 180℃); Surface: Nitriding treatment, wear resistance ≥ 5000 working hours

1. Abrasive wear of the seal caused by high-sand content mud scouring; 2. Fatigue cracking of the piston rod due to long-term alternating loads from pump vibration

1. Control mud sand content ≤ 12% (mass fraction) and equip with 20-micron high-precision desander; 2. Avoid sudden load changes (load change rate ≤ 10%/s) and check piston rod coaxiality monthly (deviation ≤ 0.15 mm)

2

Piston AH010004-0800

Piston body: 35CrMo alloy steel (carburizing treatment, surface hardness HRC 55-60); Piston seal: Nitrile rubber (NBR, oil-resistant); Piston head: Polyurethane (PU) composite, wear-resistant

1. Aging and hardening of the NBR seal due to long-term contact with oil-based mud; 2. Deformation of the piston head caused by uneven heating of the pump body

1. Replace the seal every 800 operating hours when used in oil-based mud systems; 2. Preheat the pump body evenly before startup in low-temperature environments (≥ -10℃)

3

Piston AH010004-1000

Piston body: Stainless steel 304 (corrosion-resistant); Piston seal: Ethylene propylene rubber (EPDM, low-temperature resistant down to -40℃); Dimensional tolerance: IT7, high assembly precision

1. Pitting corrosion of the piston body caused by saltwater mud in offshore drilling; 2. Hardening and cracking of the seal in ultra-low temperature environments

1. Apply anti-salt spray coating to the piston body for offshore use; 2. Preheat the seal to room temperature before installation in ultra-low temperature (-40℃ to 0℃) working conditions

4

Piston AH010004-0900

Piston body: Aluminum bronze ZCuAl10Fe3 (high strength, impact resistance ≥ 15 J/cm²); Piston seal: Silicone rubber (VMQ, high-temperature resistant up to 250℃); Piston pin: 2Cr13 stainless steel, self-lubricating

1. Thermal deformation of the piston body due to high-temperature mud (exceeding 200℃); 2. Wear of the piston pin due to insufficient lubrication during high-speed operation

1. Operate within the maximum temperature limit (≤ 250℃) and check mud temperature regularly; 2. Inject high-temperature lubricating grease (NLGI Grade 2) into the piston pin every 400 operating hours

5

Piston AH010004-0700

Piston body: Gray cast iron HT250 (cost-effective, suitable for low-pressure systems); Piston seal: FKM rubber; Surface: Phosphating treatment, anti-rust

1. Corrosion of the piston body caused by moisture intrusion during storage; 2. Seal extrusion deformation due to over-pressure operation

1. Store spare pistons in a dry environment (humidity ≤ 60%) with anti-rust oil; 2. Operate within the rated pressure range (≤ 30 MPa) and install a pressure relief valve to avoid over-pressure

6

Piston AH010004-0600

Piston body: 45# carbon steel (quenched and tempered, tensile strength ≥ 600 MPa); Piston seal: Perfluoroelastomer (FFKM, chemical resistant); Piston head: Ceramic composite, ultra-high wear resistance

1. Chemical corrosion of the seal caused by aggressive mud additives; 2. Brittle cracking of the ceramic piston head due to impact during transportation/installation

1. Verify compatibility of mud additives with FFKM before use; 2. Use shock-absorbing packaging during transportation and avoid collision during installation

7

Piston AH010004-0500

Piston body: Titanium alloy (lightweight, density 4.5 g/cm³); Piston seal: NBR/PU composite; Surface: Passivation treatment, corrosion-resistant and wear-resistant

1. Wear of the composite seal caused by long-term high-speed reciprocation; 2. Fatigue failure of the piston rod due to long-term heavy-load operation

1. Limit the maximum reciprocating speed ≤ 300 times/min; 2. Avoid operating at more than 110% of the rated load and replace the piston every 1200 operating hours under heavy-load conditions

8

Piston AH010004-0400

Piston body: 30CrMnSiA alloy steel (high fatigue strength ≥ 500 MPa); Piston seal: EPDM rubber; Piston rod: Chrome plating, surface roughness Ra ≤ 0.8 μm

1. Peeling of the chrome plating on the piston rod due to improper assembly scratching; 2. Seal leakage caused by foreign particles entering the sealing gap

1. Use a guide sleeve during assembly to avoid scratching the piston rod; 2. Install a pre-filter in the mud inlet pipeline to prevent foreign particles (≥ 50 μm) from entering

9

Piston AH010004-0300

Piston body: Nickel-chromium alloy (high-temperature resistant up to 220℃); Piston seal: High-temperature resistant FKM rubber; Dimensional stability: ≤ 0.02 mm under full working temperature range

1. Oxidation wear of the piston body surface at high temperatures; 2. Aging of the seal due to long-term high-temperature exposure

1. Regularly inspect the oxidation layer on the piston body surface (remove and re-passivate when thickness ≥ 0.1 mm); 2. Replace the seal every 600 operating hours in high-temperature working conditions

10

Piston AH010004-3100

Piston body: 42CrMoV alloy steel (ultra-high strength, tensile strength ≥ 1200 MPa); Piston seal: FFKM rubber; Surface: Nitriding + chrome plating double protection

1. Fatigue cracking of the piston body due to long-term high-pressure operation; 2. Corrosion of the thread at the piston rod connection due to mud leakage

1. Operate within the rated pressure (≤ 45 MPa) and check pressure fluctuations regularly (≤ ±5% of rated pressure); 2. Apply thread sealant during assembly and check for leakage every 300 operating hours

11

Piston AH010004-3200

Piston body: Stainless steel 316L (corrosion-resistant to acid-base mud); Piston seal: VMQ rubber; Piston head: Elastic structure, shock-absorbing

1. Corrosion of the piston body caused by acid-base mud (pH < 4 or pH > 12); 2. Damage to the elastic piston head due to sudden pressure surges

1. Regularly test the pH value of the mud and adjust it to 6-10; 2. Install a pressure surge absorber in the mud pipeline to control surge pressure ≤ 1.2 times the rated pressure

12

Piston AH010004-3300

Piston body: 20CrMnTi alloy steel (carburizing treatment, wear-resistant); Piston seal: NBR rubber; Piston pin: Copper-based alloy, self-lubricating

1. Wear of the piston body surface due to long-term low-speed operation (insufficient lubrication); 2. Seizure of the piston pin due to lack of lubrication

1. Maintain the minimum operating speed ≥ 200 rpm to ensure sufficient mud lubrication; 2. Check the piston pin lubrication status every 500 operating hours and add lubricant if necessary

13

Piston AH010004-3400

Piston body: Aluminum alloy 6061 (lightweight, reducing pump load); Piston seal: FKM/PU composite; Surface: Hard anodizing, wear-resistant

1. Deformation of the aluminum alloy piston body due to uneven stress during installation; 2. Wear of the anodized layer caused by abrasive mud

1. Ensure the installation surface is flat (flatness ≤ 0.02 mm/m) and tighten the fixing bolts in a diagonal sequence; 2. Control the mud abrasive particle size ≤ 50 μm

14

Piston AH010004-3500

Piston body: High manganese steel Mn13 (wear-resistant, impact-resistant); Piston seal: EPDM rubber; Piston head: Thickened structure, suitable for heavy-load operation

1. Wear of the piston head caused by long-term heavy-load operation; 2. Corrosion of the piston body caused by moisture in the air during idle periods

1. Avoid operating at more than 120% of the rated load and check piston head wear monthly (replace when wear ≥ 0.5 mm); 2. Apply anti-rust oil to the piston body when the pump is idle for more than 7 days

15

Piston AH010004-3600

Piston body: 35CrMoV alloy steel (high fatigue life ≥ 10⁶ cycles); Piston seal: FFKM rubber; Surface: Shot peening treatment, improving fatigue strength

1. Fatigue failure of the piston body due to long-term continuous operation; 2. Damage to the seal caused by incompatible cleaning agents during maintenance

1. Arrange regular shutdown maintenance every 2000 operating hours to reduce continuous fatigue; 2. Use cleaning agents compatible with FFKM rubber (avoid strong acids, alkalis and organic solvents)