What is Chimney Draught (Draft) | Boiler Inspector Course | Crack Boiler Inspector Exam 2025

Welcome to our Boiler Inspector Course video lecture on Chimney Height Calculation, designed specifically for aspirants preparing for the JPSC Boiler Inspector Exam and other boiler safety roles. In this video, we break down how to compute the chimney-draught using key engineering formulas and easy-to-understand examples. We'll walk you through derivations, practical applications, and problem-solving strategies—perfect preparation for competitive exams and technical interviews in boiler operations.

Table of Contents (Timestamps)

00:00 Introduction – Importance of Chimney Draught in Boiler Design
02:10 Understanding Draught: Density Difference Principles
04:25 Derivation of the Draught Formula (Step-by-Step!)
07:00 Formula Breakdown: Variables and Units Explained
09:20 Worked Example I: Calculating Chimney Height for 20 mmw.c.
12:45 Worked Example II: Mass Flow Rate & Flue Gas Velocity
16:30 Key Takeaways & Tips for Boiler Inspector Exams
18:00 About the JPSC Boiler Inspector Course
19:30 How to Enroll & Contact Details
20:00 Outro & Subscribe Reminder

How to Sign Up & Contact Details

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In this lecture, you'll learn:

What is chimney draught?
Understand how natural draught arises from density differences between hot flue gases and cooler ambient air.

Concept clarity
Break down the physical meaning of each variable and how changes in temperature or composition affect draught.

Worked numerical examples

Finding the required chimney height to achieve a target draught (e.g., 20 mmw.c.)

Computing mass flow rate and flue gas velocity using derived formulas—critical for fluid flow and process design sections in Boiler Inspector exams.

Exam strategy
Learn how to present derivations neatly in exams, manage units, and avoid common mistakes in chimney design questions.

Why This Video Helps with Your Boiler Inspector Exam Preparation

Aligned with Paper I & II syllabus
Concepts like chimney foundation, draught systems, and combustion air handling are key segments in Engineering Paper I under Feedwater & Air Handling Equipment and Boiler & Chimney Foundation topics.
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Practical and conceptual clarity
Our approach combines theoretical derivation with real-world examples—exactly what Boiler Inspector aspirants need to confidently tackle objective and descriptive questions.

Perfect for revision
Use the timestamps to revisit derivations or example calculations—ideal for quick recaps during exam season.

Enroll in the JPSC Boiler Inspector Exam Preparation Course

Master both engineering fundamentals and exam techniques with our JPSC Boiler Inspector Course:

Mode: Live online classes + mentorship + test practice

Duration: 5 months | 220+ hours | 50+ sessions | weekly mock & subjective tests

Coverage: Comprehensive coverage of both Engineering Paper I & II, aligned with Jharkhand Gazette and Indian Boiler Regulations.
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Paper I Highlights:

Boiler load and weight calculations

Stress analysis in boiler shells

Steam boiler operations, superheaters, economizers

Draft systems, air handling, chimney design

Paper II Highlights:

Thermodynamics, steam cycles

Boiler defects and NDT methods

Safety protocols, instrumentation, materials, and sketching

Additional Features:

Live HD classes with whiteboard teaching

Concept notes, schematics & formula sheets

Mock tests, full-length exam simulations

IBR legal coverage, sketching practice, answer-writing guidance

Performance tracking & mentorship support

Discounted pricing: ~₹30,000 (original ₹65,000) — Enroll now and save!
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Perfect for engineering grads, working professionals, and diploma holders aiming for tech and safety roles in boilers and pressure vessels.

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