BOILER HANGERS

The selection criterion is load variation sensitivity. A spring hanger's support force changes as the pipe moves — by approximately 25% of hot load across the full travel range. This is acceptable for most economizer, convection tube, and process steam piping locations where nozzle loads are not critical.

A constant support hanger is required where load variation cannot be tolerated — mainly at connections to pressure vessel nozzles (steam drum, superheater headers), turbine inlet connections, and any location where the pipe stress analysis shows that spring-generated load variation exceeds the allowable nozzle load. Pipe stress software (Caesar II, ROHR2) will flag these locations. If you have a stress isometric or BOM, send it to us and we'll confirm the hanger type selection for each support point.

Hot load is the support force required when the pipe is at operating temperature and pressure — this is the design load from the pipe stress analysis and is what the hanger must deliver in service.

Cold load is the setting position of the hanger at ambient temperature before pipe hydro-test and commissioning. Because the pipe moves from cold to hot position during startup, the spring is preset to a position that delivers the correct hot load when the pipe reaches its operating position. We set every hanger to the cold load position before delivery and provide a setting sheet confirming the cold indicator position. Installers lock the hanger travel during construction and release the lock before startup.

The fastest route to a quote is a pipe hanger bill of materials (BOM) from the pipe stress engineer or the boiler OEM. A typical hanger BOM lists each support point with: hanger type (spring / constant / rigid), hot load (kg or lbs), travel range (mm), pipe operating temperature, and any applicable design standard.

If the BOM is not yet available, a preliminary estimate can be prepared with: boiler type and steam capacity, number and approximate location of support points, operating temperature and pressure of the steam lines, and applicable design code (ASME B31.1 / GB / EN).

Standard documentation package per unit includes: EN 10204 3.1 material test certificate for structural steel components, load test report with actual load vs. deflection curve, dimensional inspection record, installation setting sheet (cold indicator position and hot load), and packing list keyed to the hanger BOM tag numbers.

For projects with a formal QCP/ITP, we can define hold and witness points for material verification, assembly inspection, and load test acceptance. All documents are traceable to individual unit serial numbers.

Yes. For replacement units, we need the nameplate information from the existing hanger — typically stamped on the housing or a attached tag — which includes: hanger type designation, hot load, travel, and spring rate. If the nameplate is unreadable, we can manufacture to site measurements and the pipe operating conditions. Replacement hangers are preset to the same cold setting as the originals so no re-calibration is needed during the outage. We can also manufacture to match proprietary designs from other hanger manufacturers if dimensions and performance data are provided.

Yes. ORL Power supplies complete boiler pressure part packages — superheaters, reheaters, economizers, steam drums, headers, and water walls — and can include the hanger system in the same order. All components ship together in the same container, reducing freight cost and customs filings. One QC team covers the complete package inspection, and one documentation file covers all pressure parts and hangers for the project. This is the standard arrangement for EPC contractors ordering a complete boiler island from one source.