HHF-800 Breather Cap Parts Guide

1

NB800M.10.01

Baffle plate

Carbon steel (AISI 1018), anti-corrosion coated, precision-stamped for structural rigidity, designed to redirect airflow and prevent fluid splatter.

1. Wear from constant airflow and debris impact; 2. Corrosion from moisture and drilling fluid exposure; 3. Bending from improper handling during maintenance.

1. Inspect for bending or deformation during routine checks; 2. Clean debris buildup regularly to reduce impact wear; 3. Touch up anti-corrosion coating annually.

2

NB800M.10.02

Connection plate（Ⅰ）

Alloy steel (AISI 4140), heat-treated for tensile strength, precision-machined for secure component mounting and system connection.

1. Thread wear from repeated assembly/disassembly; 2. Fatigue cracking from vibration; 3. Corrosion from environmental exposure.

1. Tighten fasteners to recommended torque to reduce stress; 2. Avoid over-tightening to prevent thread damage; 3. Inspect for cracks during maintenance.

3

NB800M.10.04

Connection plate（Ⅱ）

Alloy steel (AISI 4140), matching Connection plate（Ⅰ） for dimensional compatibility, coated for corrosion resistance.

1. Misalignment-induced stress during installation; 2. Wear at mounting points from vibration; 3. Corrosion from moisture and chemicals.

1. Ensure proper alignment with adjacent components during installation; 2. Secure with compatible fasteners; 3. Clean and dry after exposure to drilling fluids.

4

NB800M.10.05

Connector

Brass, corrosion-resistant, precision-threaded for leak-free connection to the pump fluid system, compatible with high-pressure airflow.

1. Thread wear from over-tightening; 2. Leakage from improper thread engagement; 3. Corrosion from chemical exposure.

1. Use thread sealant during installation; 2. Tighten to specified torque (15-20 ft-lbs); 3. Inspect for leaks and thread damage regularly.

5

NB800M.10.06

Press plate for filter screen

Carbon steel, stamped and formed, designed to secure the copper mesh filter, ensuring uniform pressure distribution.

1. Deformation from over-tightening; 2. Wear from filter mesh friction; 3. Corrosion from moisture trapped in the filter.

1. Tighten evenly to avoid deformation; 2. Replace when signs of warping appear; 3. Clean with the filter mesh to prevent moisture buildup.

6

NB800M.10.08

Upper cover

Carbon steel with powder-coat finish, durable, weather-resistant, designed to protect internal components from debris and moisture.

1. Impact damage from job-site debris; 2. Corrosion from rain, humidity, or drilling fluids; 3. Seal wear at the mating surface.

1. Mount in a protected location to avoid impact; 2. Inspect powder coat for chips and touch up as needed; 3. Ensure proper seating with the gasket during reinstallation.

1

NB800M.10.03

Gasket

Nitrile Butadiene Rubber (NBR), 70-75 durometer, oil-resistant, reinforced for high-pressure sealing between the upper cover and base.

1. Compression set from prolonged use; 2. Degradation from oil and chemical exposure; 3. Tearing from improper installation.

1. Replace after each disassembly; 2. Verify compatibility with system fluids; 3. Ensure mating surfaces are clean and flat before installation.

2

NB800M.10.07

Copper mesh

Pure copper, fine-mesh design (200-300 mesh) for high-efficiency filtration, corrosion-resistant, flexible for secure seating.

1. Clogging from dust, debris, and oil residue; 2. Damage from improper cleaning (e.g., harsh chemicals); 3. Corrosion from prolonged moisture exposure.

1. Clean regularly with mild solvent or compressed air; 2. Replace if mesh is torn or heavily clogged; 3. Avoid bending or stretching during maintenance.

1

ANSI/ASME B18.2.1-1996

Bolt：3/8-16×1

Carbon steel (Grade 8), zinc-plated for corrosion resistance, precision-threaded per ANSI/ASME B18.2.1-1996, tensile strength 150,000 Psi.

1. Vibration-induced loosening; 2. Thread wear from repeated assembly; 3. Corrosion from moisture and drilling fluids.

1. Torque to 25-30 ft-lbs; 2. Use lock washers (if applicable) for anti-loosening protection; 3. Inspect threads for damage before reinstallation.

2

ANSI/ASME B18.6.3-2003

Bolt：10（0.190）0-24×3/8

Carbon steel, zinc-plated, precision-threaded per ANSI/ASME B18.6.3-2003, small-diameter design for securing delicate components like the filter press plate.

1. Thread stripping from over-tightening; 2. Fatigue from vibration; 3. Corrosion-induced thread seizure.

1. Tighten to 8-10 ft-lbs to avoid damage; 2. Hand-thread first to prevent cross-threading; 3. Replace if threads are stripped or bent.

1

How often should the copper mesh filter be cleaned or replaced?

Clean the NB800M.10.07 copper mesh every 200 hours of operation with mild solvent or compressed air. Replace it if the mesh is torn, heavily clogged (unable to clean), or shows signs of corrosion. For dusty/offshore environments, shorten cleaning intervals to 100 hours.

2

What torque settings are recommended for the breather cap bolts?

Tighten ANSI/ASME B18.2.1-1996 3/8-16×1 bolts to 25-30 ft-lbs, and ANSI/ASME B18.6.3-2003 10-24×3/8 bolts to 8-10 ft-lbs. Over-tightening can damage threads or components, while under-tightening leads to loosening and leaks.

3

How to prevent gasket failure in the breather cap?

Always replace the NB800M.10.03 NBR gasket after each disassembly, as NBR loses elasticity with prolonged compression. Ensure mating surfaces (upper cover and base) are clean, flat, and free of debris before installation. Verify gasket compatibility with system fluids to avoid degradation.