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Release
Date: May 7, 2026
Delivery:
Online
Code
Version: 2025
Presentation
Style: Documentary
Approximate Time: 3 hours
Continuing Education Qualification: IS
Commission, O Endorsement, PEI Inservice
Education Partner for Credential
Renewal: API 510
Synopsis:
This course steps learners through what boiler blowoff is and why it is
performed. The difference between blowoff and blowdown and other related
terminology begins the training, followed by more detailed information on how
surface blowdown and bottom blowoff are performed, and the components used to
perform these procedures, such as valves, piping, and skimmers.
Next
learners are introduced to ASME BPV Code and NBIC requirements for blowdown and
blowoff systems, valves and piping. The National Board publication NB-27,
Guide to Blowoff Vessels is reviewed, specifically looking at blowoff
tanks and separators. The course concludes with learning about blowoff tank
sizing and vent design.
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General Information
Fundamentals of Power Boiler
Blowoff Systems steps learners through what
boiler blowoff is and why it is performed. The difference between blowoff and
blowdown and other related terminology begins the training, followed by more
detailed information on how surface blowdown and bottom blowoff are performed,
and the components used to perform these procedures, such as valves, piping, and
skimmers. Next learners are introduced to ASME BPV Code and NBIC
requirements for blowdown and blowoff systems, valves and piping. The National
Board publication NB-27, Guide to Blowoff Vessels is reviewed,
specifically looking at blowoff tanks and separators. The course concludes with
learning about blowoff tank sizing and vent
design. Learning Outcomes
After completing this course, students will be able to:
Properly use the terms blowoff and
blowdown
. Explain Code requirements for surface blowdown.
Explain
Code requirements for bottom blowoff.
Describe blowoff valve requirements.
Describe piping requirements. Explain flow phenomena
in blowoff piping, such as steam flashing and water hammer. Understand the contents of the National Board Guide
for Blowoff Vessels
(NB-27).
Reference
Materials
Although not required, each student may find it helpful to
have the following materials (currently mandated edition): ASME Section I,
Rules for
Construction of Power Boilers ASME
B31.1-1-2022, Power Piping National
Board Inspection Code (NBIC), Part 1, Installation National
Board Publication, NB-27, Guide for Blowoff Vessels
Note: ASME Code and Standards may be
ordered through the ASME
website. Criteria for
Successful Completion
As a minimum, for a National
Board Certificate of Completion to be issued, students must:
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