SUBSTRUCTURE DZ4505/9-S Components

1

Substructure (DZ4505/9-S)

High-strength low-alloy steel (Q355B), welded and anti-corrosion treated (sandblasted + epoxy paint)

1. Uneven load distribution during installation; 2. Corrosion from on-site moisture/drilling fluid; 3. Fatigue damage from long-term vibration.

1. Ensure level installation per API Spec 4F standards; 2. Inspect welds quarterly for cracks; 3. Reapply anti-corrosion coating annually in humid environments.

2

Dog House

Galvanized steel sheet + thermal insulation layer, sealed with weather-resistant rubber strips

1. Impact damage from on-site debris; 2. Sealing failure due to weathering; 3. Thermal insulation layer degradation from extreme temperatures.

1. Install protective baffles around the dog house; 2. Replace weather-resistant strips semi-annually; 3. Avoid direct exposure to open flames.

3

Toolkit House

Mild steel (SPHC) with powder coating, reinforced door frame

1. Structural deformation from heavy tool stacking; 2. Coating peeling due to chemical contact; 3. Hinge wear from frequent opening/closing.

1. Distribute tool weight evenly inside; 2. Clean with neutral detergent to avoid chemical corrosion; 3. Lubricate hinges monthly with lithium-based grease.

1

Escape assembly

Stainless steel (304) ladder rungs + carbon steel frame, anti-slip surface treatment

1. Rusting from on-site humidity; 2. Anti-slip surface wear from frequent use; 3. Frame loosening due to vibration.

1. Inspect for rust and tighten fasteners monthly; 2. Clean anti-slip surfaces weekly to remove mud; 3. Conduct annual load-bearing tests per OSHA 1926.1053.

2

Tools Elevator

Alloy steel (40CrNiMoA), heat-treated for high toughness, surface carburized

1. Wear from contact with heavy tools; 2. Fatigue cracks from repeated lifting cycles; 3. Deformation from overloading.

1. Never exceed rated load (marked on the elevator); 2. Inspect contact surfaces for wear weekly; 3. Store in a dry, dust-free area to avoid surface damage.

3

Stand Pipe Rack

Welded steel (Q235A) with anti-rust coating, reinforced support brackets

1. Pipe impact damage during placement; 2. Bracket deformation from uneven pipe weight; 3. Corrosion from pipeline leakage.

1. Use soft padding between pipes and the rack; 2. Arrange pipes evenly to distribute weight; 3. Inspect for pipeline leaks and rack corrosion monthly.

4

BOP Trail and Lift Tools

High-strength alloy steel (20Mn2), forged structure, zinc-plated for corrosion resistance

1. Wear from BOP weight during lifting; 2. Thread damage from improper connection; 3. Fatigue failure from repeated heavy-load use.

1. Ensure proper thread engagement before lifting; 2. Inspect for cracks and thread wear after each use; 3. Match with BOP weight rating (per API Spec 16A).

5

5T Air Winch

Cast steel (HT200) housing, carbon steel (65Mn) wire rope, copper alloy bearings

1. Wire rope wear from friction and corrosion; 2. Bearing damage from lack of lubrication; 3. Housing deformation from impact.

1. Lubricate bearings and wire rope weekly; 2. Replace wire rope if wear exceeds 10% of diameter; 3. Avoid operating in extreme dust or waterlogged environments.

Are these components compatible with other substructure models?

No. All components are custom-manufactured for Substructure DZ4505/9-S, with precise dimensions and load ratings matching the original equipment. Cross-model use may cause structural failure or safety hazards.

How often should the substructure’s anti-corrosion coating be inspected?

Inspect quarterly; reapply if peeling, chipping, or rust is found. For coastal or high-humidity drilling sites, increase inspection frequency to bi-monthly, per ISO 12944-2 corrosion protection standards.

What is the rated load limit for the Tools Elevator?

The Tools Elevator is rated for drilling tool loads compatible with DZ4505/9-S substructure (max 10T). Never exceed the marked rated load, as it will cause fatigue damage and pose safety risks.