The runs of pipe on a pipe layout are shown with­out any indication of pipe sizes. This is also true for fittings and valves. Dimensioning for such components is accomplished by the addition of specifications and notes to the drawings. How­ever, length, height, and location dimensions are shown on the drawing. Location dimensions are applied to the centerlines of the pipe and fittings to serve as reference points for locating items in the layout, Figure 23.9(a) and (b). Dimensions are usually expressed in feet and inches when they measure more than one foot.

METHODS OF REPRESENTING A PIPE LAYOUT

A pipe layout can be represented by any number of orthographic views, Figure 23.10(a); by an oblique view, Figure 23.10(b); or by an isometric view, Figure 23.10(c) and Figure 23.11(a), and Figure 23.11(b). Note that each of the methods shown in the figure illustrates the same pipe layout.

STANDARD PIPE THROUGHOUT FITTINGS TO MATCH

(b) DIMENSIONS APPLIED TO A SINGLE-LINE LAYOUT.

FIGURE 23.9 ■ Typical dimensioning practices.

1. Identify the pipe fittings and/or valves represented by the following symbols.

b. Identify each welded pipe fitting, ® through (H, given on the pipe layout.

<8____________________________________

d____________________________________

a____________________________________

®____________________________________

d____________________________________

a____________________________________

є_____________________________________

®____________________________________

3. Develop a right isometric drawing from the three-view orthographic drawing given.

2. a. Apply the dimensions and notes that would be required for the pipe layout as follows. Assume any sizes desired.

4. Figure 23.11(a) is a single-line representation of the typical pipe layout for a heating system, Figure 23.11(b), shown on page 278. However, several modifications were made in the single­line figure to illustrate additional common fittings.

a. Identify the pipe fittings represented by symbols (A through

(8 _______________________________________

(H ________________________________

Q_______________________________________

J__________________________________

b. Name two fittings included in Figure 23.11(a) that are not shown in Figure 23.11(b).

Prepare a two-view orthographic drawing from the isometric pipe layout that follows. Show a top view (plan view) and a front view (elevation view).

c. Refer to 5a. and prepare sectional sketches showing how the welds will appear at points (§ and (B.

d. Identify the type of joints required at ® and.

(8 (B