Handhole Cover Plate for Fire Tube Coal Boiler
The handhole cover plate for fire tube coal boiler is engineered to provide a secure, pressure‑rated opening for inspection, cleaning and maintenance of the boiler’s fire‑tube bundle. Constructed from high‑grade carbon steel and finished with a corrosion‑resistant coating, the cover maintains the integrity of the pressure vessel while allowing quick access for plant personnel. Its modular design fits standard fire‑tube boiler dimensions and can be customized to meet specific flange sizes, bolt patterns, and temperature‑class requirements.
Key Benefits & Features
- Robust load capacity – designed for operating pressures up to 2.5 MPa (360 psi) and temperatures up to 400 °C (752 °F).
- Seamless integration – compatible with ANSI, EN and GB boiler standards; no additional machining required for standard flange sizes.
- Enhanced safety – double‑locking mechanism prevents accidental opening under pressure.
- Corrosion protection – hot‑dip galvanized or stainless‑steel options extend service life in harsh, coal‑fired environments.
- Customizable options – bolt circle, gasket material, and surface finish can be tailored per order.
- Low maintenance – smooth interior surface reduces fouling and simplifies cleaning cycles.
Technical Specifications
| Parameter | Typical Range | Unit | Customizable |
|---|---|---|---|
| Nominal Size (Flange Diameter) | 200 – 800 | mm | Yes |
| Design Pressure | 0.6 – 2.5 | MPa | Yes |
| Operating Temperature | -20 – 400 | °C | Yes |
| Material | Carbon Steel / Stainless Steel 304/316 | – | Yes |
| Gasket Type | Compressed Fibre, PTFE, Spiral Wound | – | Yes |
| Finish | Hot‑dip Galvanized, Epoxy Paint, Nitrated | – | Yes |
All dimensions are based on the ASME Section VIII, Division 1 standard unless otherwise specified. Custom tolerances are available upon request.
Industry Certifications & Safety
Our handhole cover plates are manufactured in facilities audited to ISO 9001:2015 quality management standards. Each batch undergoes pressure testing and non‑destructive examination to verify compliance with:
- ASME Boiler and Pressure Vessel Code (BPVC)
- EN 13445 (European Unfired Pressure Vessels)
- GB 150 (Chinese Boiler Code)
- CE Marking for equipment sold within the European Economic Area
Documentation—including material test certificates (MTC), pressure test reports, and 3‑year warranty terms—is provided with every shipment to streamline client audit processes.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for a custom handhole cover plate?
We accept orders as low as a single unit for prototype testing. For full‑scale production, the typical MOQ is 10 pieces, which allows us to optimize material usage and machining setup.
Can the cover be sized to non‑standard boiler flanges?
Yes. Our engineering team will work with you to develop a 3‑D model based on your drawing package. Once approved, the plate is machined to the exact dimensions, bolt circle, and gasket groove required.
What is the typical lead time?
Standard‑size, off‑the‑shelf plates ship within 15‑20 working days. Custom orders generally require 30‑45 days, depending on the complexity of the design and material availability.
What warranty is offered?
All handhole cover plates carry a three‑year limited warranty covering material defects and workmanship, provided the product is installed and operated according to the supplied specifications.
Ready to secure your boiler’s access points with a proven, high‑performance solution? Contact our engineering team today to discuss specifications, request a quote, or arrange a sample shipment.