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Comprehesive Boiler Manual Jan 2019

A Preview of B&CT Training LLC - Boiler Systems I & II Comprehensive Training Manual. We can customize training manuals to include your specific equipment. The outline is specifically designed to assist with compliance to V.A. Handbook 1810 requirements. For more information please call 405-401-0156 or see www.b-ct.net

A Preview of B&CT Training LLC - Boiler Systems I & II Comprehensive Training Manual. We can customize training manuals to include your specific equipment. The outline is specifically designed to assist with compliance to V.A. Handbook 1810 requirements. For more information please call 405-401-0156 or see www.b-ct.net

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vii. Heat Exchanger Stall<br />

Heat Exchanger Stall<br />

Heat Exchanger Stall<br />

Heat exchanger stall: When no steam demand, reducer stops incoming steam, steam in exchanger cools and<br />

shrinks making a vacuum. This vacuum “sucks” condensate back into the exchanger, filling it with water. When<br />

steam demand is needed again, the reducer is opened again, hot steam hitting cold water: WATER HAMMER.<br />

Symptoms:<br />

Steam trap is cold.<br />

Heat Exchanger becomes waterlogged (pooling of condensate).<br />

Temperature is uneven in heat exchanger.<br />

Water hammer (vacuum-implosion induced shock waves)<br />

occurs as hot steam hits cold condensate, damaging tubes.<br />

Water Hammer on heat<br />

exchanger pipes.<br />

Back pressure<br />

prevents condensate<br />

from escaping.<br />

Cure: Check unit’s vacuum breaker,<br />

consider using Automatic Pump Traps (APT)<br />

P a g e 120

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