Tetra has published a series of guides which are available for ordering.
Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG). Visual inspections are performed at regular intervals in accordance with the requirements of regulatory bodies and insurers.Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG). Visual inspections are performed at regular intervals in accordance with the requirements of regulatory bodies and insurers.
A selection of technical papers available for reference.
Selected papers, presentations and articles from major industry conferences and events.
With over 30 years of experience in power and industrial steam generation services, Tetra Engineering has along history of projects.
A HRSG operated by a European client appeared to be subject to excessive vibration, based on high noise near the unit and vibration of the casing in certain sections of the roof. The OEM and EPC had initially agreed that the vibration was a potential problem, so for this reason a study was commissioned by them. This included a field survey of noise using microphones, confirming that there were high noise levels in three different frequencies at some points outside the HRSG casing. Subsequently the OEM/EPC modified their position to hold that the observed noise was not a problem and that no further action was required. The client then requested that Tetra Engineering independently review the problem and perform additional analysis as required. The scope of work included field measurements, thermohydraulic boiler simulations and vibration risk calculations.
The LP economiser lower header on a HRSG ruptured shortly after a diverter damper incident. Tetra was approached by the client to investigate the possible root causes for the rupture. The unit went into single element control at the time of the incident and the LCV cycled through fully open / fully closed positions to maintain the drum level after “shrink”. When the damper re-opened the LCV remained closed as the drum level increased (swell). The economizer temperature increased and there was an associated increase in pressure. The safety valve failed to operate as it was accidentally gagged, causing serious over pressurisation and a burst header.
