Steam Boiler Technical Specification

STEAM BOILER AND ASSOCIATED EQUIPMENT TECHNICAL SPECIFICATION

1. The steam boiler must be a high-pressure, three-pass, fire/flue-tube, fully cylindrical, Scotch-type boiler with a rear reversal chamber, designed and manufactured in compliance with TS EN 12953 and EN standards, and TSE certified. A CE certificate alone is not sufficient.
2. Pressure parts must be manufactured from P265GH or P355GH boiler plate compliant with EN 10028. Non-pressure parts such as doors and smoke boxes may be made from S235JR boiler plate.
3. Flue tubes must be manufactured from normalized welded boiler tube compliant with EN 10217-2 up to 6 bar operating pressure, and from seamless drawn boiler tube to EN 10216-2 for pressures of 6 bar and above.
4. The manufacturer must provide material certificates.
5. Steam boiler design pressure must be 1.05 times the operating pressure; strength calculations must be based on this value.
6. The steam boiler must be tested at 1.5 times operating pressure for one hour.
7. Boiler tube sheets must have flanged edges; a flat tube sheet will not be accepted under any circumstances.
8. To achieve good combustion, the main requirement for high boiler efficiency, the flame tube must be manufactured at a sufficient diameter and length.
9. In boiler design, to reduce material use and thus cost, excessive thermal loading of heating surfaces, a practice that is problematic from a boiler engineering standpoint, must never be applied; the most suitable thermal load per unit heating surface (square meter) must be used.
10. The manufacturer must declare the boiler's heating surface area.
11. Boiler welds must be carried out by certified welders; the manufacturer must provide these certificates.
12. The steam boiler body must be insulated with 100 mm rock wool.
13. Flanges used on the steam boiler must be at least PN16 class.
14. It must have an explosion door opening directly into the combustion chamber (flame tube, furnace).
15. It must have at least one flame-viewing device made of fire-resistant ceramic glass.
16. The steam boiler must have hand-holes and manholes allowing inspection of the water side.
17. The steam boiler must have two safety valves.
18. The bottom blowdown valve must be DN40 PN16.
19. The surface blowdown valve must be DN25 PN16.
20. There must be two level regulators.
21. There must be two glass-type level gauges.
22. The feedwater pump must be stainless and of the multi-stage type.
23. Feedwater pump discharge pressure must be at least 20% higher than the steam boiler's operating pressure.
24. The feedwater pump must be able to comfortably pump water at 102°C.
25. There must be two feedwater pumps.
26. There must be three stainless disc check valves on the feedwater discharge line.
27. Condensate tank volume must equal the steam boiler's one-hour water requirement (example: a 5 t/h steam boiler requires a 5,000-liter condensate tank).
28. A tandem-type water softener must be used, sized to the water hardness.
29. All electrical devices on the steam boiler (burner, pumps, etc.) must be controlled from the boiler control panel.
30. Steam and flue gas temperatures must be readable from the panel and adjustable to the desired setting.
31. When steam or flue gas temperature exceeds the set value, a warning light system must activate, and this safety feature must stop the burner.
32. The panel must have a light and sound alarm system for minimum steam boiler water level.
33. The burner's fault indicator light must be visible on the control panel.
34. The manufacturer is obliged to provide the operator with TSE and other quality certificates, along with the installation and layout diagram and operating instructions.