Step 3. Find the volume of metal contained in the

pipe by subtracting the volume of cylinder 2 from the

volume of cylinder 1:

2337.0 - 1525.7 = 811.3 cu in.

Step 4. Find the weight of the pipe by multiplying

the volume of metal by the weight of steel, shown in

table 2-1:

811.3 × 0.284 = 230.4 lb

The weight of plate and sheet metal structures may

be found by computing the volume of metal contained

(in cubic inches), and then multiplying the volume by

the weight of the metal (per cubic inch), as shown in

table 2-2. As an example, find the weight of a steel

plate that is 68 inches in length, 44 inches wide and 1/2

inch thick. Using the formula weight = volume ×

weight of the metal per cubic inch, we use the

following procedure:

Step 1. Compute the volume of metal contained.

The weight of steel per square foot may be

Volume = length × width × thickness

determined by multiplying the thickness of the metal by

40.9. Table 2-2 lists the weight per square foot of the

V = 68 × 44 × 1/2

various gauges of uncoated plain steel sheet metal, and

also the decimal equivalents of the different gauges.

V = 1496 cu in.

Obviously, to calculate the weight of a particular

structure, you must be able to break the whole down

Step 2. Find the weight of the steel plate.

into its component geometrical parts, circles, squares,

Weight = volume of metal × weight per cu in.

rectangles, pyramids, and so on, and determine their

respective volumes. Further, you need to know the

W = 1496 × 0.284

weight of metal per cubic inch. This information can be

found in a variety of handbooks readily available in the

engineer or repair department office. Table 2-1 gives

W = 424.86 lb

the information for a few of the more common metals.

When specific job requirements are known,

estimating of material needed is no problem. However,

when estimating requirements for future use, you will

have to anticipate your needs. Referring to records of

previous jobs and records of materials expended can

help eliminate much guesswork.

In scheduling work in an HT shop, you will have to

consider the priority of each job. Most job orders will

have a ROUTINE priority; this means that they must be

done as soon as possible, within the normal capacity of

the shop. Jobs having an URGENT priority must be

2-17

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