GENERAL RULE
S
PAGE 32
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smgr.fm
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AF
ETY M
AN
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7.23
There are two types of ball catchers. Know which type of
catcher you are using. You may need to adjust your clean-out procedure according
to which type you have. The two types are as follows.
1. Catchers that stop the ball or go-devil before air can escape, and
2. Catchers that allow the air out of the pipeline after the ball or go-devil has
reached the end.
Each type has advantages and disadvantages (Figure 41).
With catcher type 1, the go-devil stops, but air is still trapped behind it. The
advantage is prevention of the sometimes violent expulsion of air at the end of the
pipe. The disadvantage is that the air must be drained from the blowout head
before the pipe line is safe to open. The pipeline must be controlled; allow no one
to open it until all compressed air is relieved.
Catcher type 2 is long enough that the compressed air escapes behind the go-
devil.
Note!
This would happen with either catcher when used with a ball instead
of a go-devil. The advantage of this is that once you hear the turbulent expulsion,
there is no pressurized air remaining in the line, and the line may be opened
immediately. The disadvantage is the expulsion itself. In this case, the end of the
line must be controlled because flying concrete and aggregate pose a hazard.
Both catchers can be safely used if care is given to the hazards involved.
WARNING
AIR
PRE
SS
URE
1
AIR
2
ctchrexplnsm1.eps
Advanta
g
e:
There is no turbulent expulsion of air.
Di
s
advanta
g
e:
Air remains in the line, because it cannot pass the
go-devil. The line must
not
be opened until all air is drained at the
blowout head.
Advanta
g
e:
All compressed air is relieved with the expulsion;
the pipe may be opened immediately.
Di
s
advanta
g
e:
There
will be a turbulent expul
s
ion
as the air escapes.
Figure 41
Types of catchers
Summary of Contents for SPB 28
Page 2: ......
Page 4: ......
Page 8: ...8 Table of Contents SPB Operation Manual...
Page 10: ......
Page 16: ...16 Introduction SPB Operation Manual...
Page 18: ......
Page 22: ...22 Specifications SPB Operation Manual SPB 35 Working Range Diagram SPB 35 235...
Page 24: ...24 Specifications SPB Operation Manual Working Range Diagram SPB 37 SPB 37 235...
Page 26: ......
Page 28: ...28 Safety S 39 41 SX Operation Manual...
Page 113: ...402indexcov eps ALPHABETICAL INDEX 700indxcov fm PAGE 83 SAFETY MANUAL Alphabetical Index...
Page 122: ...30 Overview S 39 41 SX Operation Manual...
Page 154: ...62 Operation SPB Operation Manual Lifting Instructions 1 of 3...
Page 155: ...63 Operation SPB Operation Manual Lifting Instructions 2 of 3...
Page 156: ...64 Operation SPB Operation Manual Lifting Instructions 3 of 3...
Page 200: ......
Page 216: ...124 Appendix SPB Operation Manual...