BOILER STEAM DRUM

The most useful starting point is a drum data sheet or boiler GA drawing. If those are unavailable, we can develop a preliminary layout from the following:

• • Design pressure (MAWP) and operating temperature
• • Steam capacity (t/h) and boiler type (natural / forced circulation, CFB, HRSG, etc.)
• • Shell inside diameter and overall length, if known
• • Nozzle list — quantity, size, and schedule (riser, downcomer, feedwater, steam outlet, drain, vent, etc.)
• • Applicable design code (ASME Section I / GB/T 16507 / EN 12952 / other)
• • New fabrication or replacement — if replacement, existing GA drawing or dimensional survey data
• • Required delivery date or outage window

Yes — drum replacement is a core part of our business. We work in two modes:

• • Build to print — if original drawings are available, we manufacture to match existing nozzle layout, saddle positions, and head profile
• • Reverse engineering — if drawings are unavailable, we work from field measurements or a dimensional survey to develop a manufacturing drawing for approval before fabrication begins

Before confirming the order we carry out a nozzle layout review to verify connection compatibility with existing pipework and support structures — preventing costly modifications during the outage window.

• • ASME Section I — Power Boilers. ORL Power holds an ASME S-stamp and operates under an approved quality programme
• • Chinese GB standards — GB/T 16507 Water-tube Boilers, TSG G0001 Boiler Safety Technical Regulation. Grade A Boiler Manufacturer licence
• • EN 12952 — European water-tube boiler standard
• • Project-specific codes — IBR (India), ГОСТ (CIS), and others confirmed during technical review

PWHT requirements depend on design code, shell material, and wall thickness:

• • Under ASME Section I, PWHT is mandatory for carbon steel drums with wall thickness exceeding 38 mm (1½ in), or where Cr-Mo (P-No. 4 / 5) materials are used regardless of thickness
• • Under GB/T 16507, similar thresholds apply based on material group and plate thickness
• • For high-pressure drums (typically >10 MPa) with thick SA-516 Gr.70 or 13MnNiMoR shells, PWHT is almost always required

ORL Power performs PWHT in calibrated furnaces with thermocouple monitoring and continuous chart recording. PWHT records form part of the standard documentation package.

Standard steam drum delivery typically includes:

• • Complete shell with all nozzles, manholes, and handholes
• • Internal steam separation devices (cyclones, chevron driers, feedwater distributors)
• • Internal support structures and anti-surge components
• • Protective coating and sea-worthy heavy-lift packing
• • Complete documentation package (MTCs, WPS/PQR, PWHT records, NDE reports, hydro-test report, as-built drawing)

Additional items — external saddle supports, connecting piping, and instrumentation — can be included based on your project scope.

Lead time depends on shell size, wall thickness, nozzle count, PWHT scope, and production loading. Typical ranges after drawing approval:

• • Small industrial drums (ID ≤ 1,000 mm, P ≤ 4 MPa): 10–14 weeks
• • Medium drums (ID 1,000–1,600 mm, up to 10 MPa): 14–20 weeks
• • Large high-pressure drums (ID > 1,600 mm, 10–19 MPa): 20–28 weeks

For planned outages, share your shutdown window at the enquiry stage so we can build the schedule from your required delivery date backward. Contact us for emergency replacement situations.