With our steam blowing and steam blow out services, we remove mill scale and construction debris from newly installed permanent steam systems, ensuring proper system functioning, extending the life of your equipment and providing you peace of mind.
Your operation depends on the reliability of all turbine equipment and components, including your boilers and pipelines. If any material becomes dislodged in your superheaters, reheaters, and steam pipelines, it can hit and damage your turbine’s blades, causing costly downtime.
ESI FastSteam® steam blowing services:
- Delivers exception cleaning efficiency and cleanliness standards
- Minimizes noise and disruption to other critical path plant operations
- Is environmentally friendly
- Is highly cost-effective
- Provides you a fast, painless process
Steam Blowing Procedure
Steam blowing is one of the initial stages of start-up operation. It uses a high drag force on the surface of your piping to remove and capture debris from your system. There are two types of steam blowing, the puffing method, and the continuous blowing method. At ESI, we provide high-velocity steam blowing and steam blow out — we use low-pressure steam at near-sonic speeds. Before beginning steam blowing, it’s critical to ensure your system is ready for it.
Before steam blowing:
- Complete chemical cleaning of your system to ensure piping is ready for operation
- Complete hydraulic testing of lines
- Ensure all system parts, components and plates are properly set up for steam blowing
Puffing Method Procedure:
- Boiler pressure is slowly raised to the required pressure level and firing rate is increased
- Drum level is brought slightly above normal — when the blowing begins, water level raises beyond sight, as blow proceeds it drops below lowest sight level if water level is maintained at or below normal.
- The first blow is performed at low pressure to check temporary pipe supports and anchors, which must be in place
- Temporary valve opens to blow through superheater, main steam pipe and temporary pipe
- First few steam blows are conducted without target plates until steam color becomes clear.
- Then preliminary target or impact plates are placed to capture particles going with the steam
- While blowing, fire is put out and pressure is dropped, ensuring proper temperature differential to dislodge any adhering material
- Steam blowing valve is closed and boiler is started
- Final target plate of turbine blade is placed once preliminary target plate is in acceptable form
- Blowing continues until indentations are acceptable to turbine manufacturer guidelines
- After mainstream line is complete, other stages are done in the similar fashion
Continuous Blowing Method Procedure:
In the continuous blowing method, the process is the same as in the puffing method, except pressure is maintained continuously during the blow to limit sudden forces on temporary piping and reduce stress on the boiler system. It puts less stress on your system, but the drawback is that it delivers a slightly lower standard of cleanliness. Depending on the sturdiness and cleanliness requirements of your system, either method may be a good fit.
We Take Total Precaution with Steam Blowing
Steam blowing comes with hazards, such as high thermal stress on your boiler. We take great care to use the minimum necessary pressure, closely monitor every detail and ensure a safe process. At ESI, we take safety, health and the environment seriously, our engineers:
- Are trained and equipped for every project
- Coordinate all efforts with proper plant personnel
- Observe all safety protocols
- Verify and account for all hazards before working with equipment