GENERAL RULE
S
700+smgr.fm
PAGE 41
S
AF
ETY M
AN
U
AL
8.23
The following points must be observed when locating a block-
age.
• Pump in
reverse
for
at least two strokes,
then stop the pump. In the case of a
mechanical pump (which cannot be reversed), it is important to carefully fol-
low the manufacturer’s instructions for relieving line pressure before any
clamp is opened.
Do not allow anyone to open the pipeline
until the pres-
sure is relieved (Figure 53).
• Wear PPE when opening a blocked pipeline.
• Clear the area of nonessential personnel before opening the line.
• In all cases, the blockage must be removed before pumping again. Remember
that air will be introduced when the system is taken apart, and keep personnel
away from the discharge when restarting.
• Plugs will be found: (in the order of likelihood) reducers, hoses, elbows, and
pipe.
• If you are tapping the pipe to find the plug, the sound will be a dull thud (tik-
tik) rather than a ringing sound (tong-tong) at the spot of the plug, because the
jammed material will keep the pipeline from vibrating. This method won’t
find a plug in a hose.
• To find a plug in a hose: with the pressure relieved, tap or step on the hose to
locate the hard spot where the hose is plugged.
8.24
To remove a blockage when reversing does not work, first
relieve the line pressure, locate the blockage, then disconnect the plugged system,
elevate it and tap on the plugged area with a hammer or piece of wood at the
blockage. Break down the blockage and shake it out the end of the hose or pipe.
Do not re-hook the system until the blockage is removed.
8.25
It is possible that some pressure will remain in the pipeline
after reversing the pump. Wear face protection, and turn away from the pipeline
when opening the clamp. Use a shovel or other tool that will assure a safe distance
from clamps to avoid concrete blowing in your eyes.
8.26
If the pump or associated equipment develops a problem that
creates an unsafe condition, you must stop pumping immediately! Do not restart
until the unsafe condition has been remedied.
WARNING
Figure 53
Never open a
pressurized pipeline
WARNING
WARNING
WARNING
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Страница 22: ...22 Specifications SPB Operation Manual SPB 35 Working Range Diagram SPB 35 235...
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