October 2013
Intermediate to advanced
306 pages
12h 17m
English
Content preview from Estimating for Heating and Ventilating, 3rd Edition
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BUILDER'S WORK
239
Manholes for inspection and maintenance, and adequate natural
ventilation are necessary.
Pipe Trenches and Ducts
Tables 15 and 18 inclusive give cross-sectional dimensions in clear
for pipe trenches and vertical ducts.
Table
15.
PIPE TRENCHES FITTED WITH MOVABLE COVERS.
MINIMUM CROSS-SECTIONAL DIMENSIONS
MM IN
CLEAR
For straight pipes with screwed joints.
No allowance made
for
valves
or
branches.
Bore of pipe Two pipes Single pipe
mm in
Insulated Uninsulated Insulated Uninsulated
mm in
Width Height Width
Height
Width
Height Width
Height
15
i
260 205 230 150
205 205 180 150
20
Î
260 205 230 150 205 20
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