Page 23 - Practical Technology 2025

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Clinical Pharmacy-Pharm D Level Three 2 Semester 2024/2025 Pharmaceutical Technology (PT 607)

1. Single pass tubular heater (Fixed head)
• Construction

• Consists of a bundle of parallel tubes made of a good conductor to
increase heat transfer rate (q)

• The bundle is surrounded by a cylindrical shell made of a bad heat
conductor to minimize heat loss through the shell wall

• It is provided with two distribution chambers as an inlet and outlet of
heated fluid.

• Operation

1. The steam is introduced through the space surrounding the tubes to heat

the tubes and any condensed steam will be removed as drips.

2. The fluid to be heated is introduced into one of the distribution chambers,

passing through the tubes where it is heated before being collected from

the outlet in the other chamber.

3. Any non-condensed gases will be removed as vent.

Note: It is called single pass heater as the one shell-side path of the

steam and the one tube-side path of the fluid to be heated is the cause

of the nomenclature

• Advantages and disadvantages:

Advantages Disadvantages

1. Putting large heating surface reduced
Large heating surface can be packed the velocity of the fluid to be heated

into small volume (by increasing the allowing formation of scales on the
number of tubes (A) increasing the

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