Before the elastic limit was
exceeded, the water was running out between the staves as fast as the
pump forced it in. On the following day, pipe thus tested would carry
the pressure for which it was designed without leaking. Except for
defects in the band, pipe of this kind will not burst in the service
for which it is properly designed. This is true, without exception, of
the 100,000 pieces of pipe in this service.
There has been some trouble with a number of the riveted splices on the
banding. Such a splice occurs for every spool of banding used. In every
case where one of these splices has pulled apart, the break was the
result of defective riveting, permitting the rivets to pull out. In no
case has a rivet been found sheared off, and even one good rivet appears
to be sufficient to prevent rupture. The explanation is found in the
high frictional resistance between the band and the pipe, which
distributes the weakness of a bad splice over several adjacent turns of
the band around the pipe. The band loosens a few turns only on either
side of a parted splice, generally not more than three. In no case has
any pipe been removed from the trench, repairs being made without
interruption to the flow of water.
It is desirable to substitute welding for the riveting of these splices.
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25