Alteration

740

Example Service Module: Alteration

743

ALTERATION

743.1

FUNCTIONAL ZONE

To demonstrate the effect of functional zone replanning, it is assumed that

the radiology suite in the opening configuration requires expansion to

nearly twice its original size, from four to seven radiology rooms, including

a special procedures room. To achieve this, the outpatient department is

relocated elsewhere and some offices taken over to supplement the

departmental offices.

The change of use of the offices causes little alteration to service layouts,

but the new radiology rooms require complete alteration of the branch

services in that area.

Figure 740-8 shows the revised layout with proposed service drops in the

area affected by the change.

743.2

SERVICE ZONE

Figures 740-9, 10, and 11 show the revised layouts for the three services.

In each case, the main distribution remains unchanged.

743.2.1

Main Distribution

The HVC supply and general exhaust/return main ducts are all permanent

installations sized to handle up to the maximum air flow of 24,000 cfm and

the alteration of functions in this example does not significantly change the

cfm requirement from before. The slight increase in toilet exhaust

requirement can be handled by the original duct.

The electrical and plumbing main distribution remain constant with some

circuit variation in the wireways, and the generally oversized plumbing

mains are capable of handling the increase in load.

743.2.2

Branch Distribution

The branch distribution in the changed area requires either extension or

replacement.

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