TECHNICAL INSTRUCTIONS
4853989
10/ 2003
Our policy is one of continuous improvement and we reserve the right to alter specifications of our products at any time.
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4.4
SOFT PACKED SEALING
Fire pumps are supplied with packed stuffing boxes with seal lubrication by copper pipe.
GLAND PACKING REPLACEMENT
Disconnect power to the pump driver, close all valves and relieve any liquid pressure. Remove gland, gland
packing, lantern ring and split bush or neck ring (where installed). A screw type packing ring extractor will
aid removal but take care not to damage the stuffing box. During removal take careful note of the order and
position of the parts so that the reverse procedure can be carried out for re assembly. Various different
arrangements of sealing are employed with the following combinations of parts being three variations:
a.
Soft p lantern ring
b.
Split bush + lantern ring + soft packing
c. Neck ring + 2 off lantern rings + soft packing
Clean and inspect all components for wear and
surface finish.
If satisfactory, cut new rings
diagonally at 45
as
shown
i
n
Fi
gur
e
4.
4.
1.
usi
ng
a
dummy shaft of the same diameter as the pump
shaft.
SOFT PACKING INSERTION
4.4.1 Soft p lantern ring
Insert the first packing ring and tap to the
bottom of the stuffing box. Each following ring should be installed in the same manner ensuring that
the cut in each packing ring is rotated approximately 120
o
to the last.
Install the lantern ring in the appropriate position aligning with the lubrication connection.
Make
allowance for the lantern ring to be pushed deeper into the stuffing box during adjustment.
4.4.2 Split bush + lantern ring + soft packing
Install the split bush and push to the bottom of the stuffing box followed by the lantern ring. Check
that the lantern ring aligns with the lubrication connection.
4.4.3 Neck ring + 2 lantern rings + soft packing
Install the neck ring and push to the bottom of the stuffing box followed by the lantern ring. Check
that the lantern ring aligns with the lubrication connection.
Insert the first packing ring and tap it down to the lantern ring. Install the following ring in the same
manner ensuring that the cut in the packing ring is rotated approximately 120
o
to the first.
Install the second lantern ring followed by the last packing ring.
Summary of Contents for HYF
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