MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 36 of 68 flowserve.com
5.2.3 Oil mist
The inlet port for all horizontal pumps is the plugged
½ in. NPT located at the top of the bearing housing.
A vent fitting has been supplied on the bearing carrier
as well as a plugged ¼ in. NPT bottom drain on the
bearing housing. See section 4.6.6.7, Oil mist
lubrication system. Do not allow oil level to remain
above the center of the bearing housing sight glass
window with purge mist (wet sump) systems.
The optional oil slinger must not be used with an oil
mist system.
There are two inlet ports for In-Line pumps. In addition
to the connection described above a second inlet is
made at the LQ137SOXJJHGSRUWRQWKHEHDULQJ
carrier [3240]. A vent fitting has been supplied on the
bearing carrier as well as a plugged LQ137ERWWRP
drain on the bearing housing for Group 1 pumps and on
the adapter [1340] for Group 2 pumps.
5.3 Impeller clearance
The impeller clearance was set at the factory based
on the application temperature at the time the pump
was purchased. (See figure 5-12.) For a reverse
vane impeller the clearance is set to the cover while
the open impeller clearance is set to the casing. If
the process temperature changes the impeller
clearance must be reset. (See section 6.6.)
Figure 5-12: Impeller clearance settings
Temperature °C (°F) Clearance mm (in.)
< 93 (200) 0.46 ± 0.08 (0.018 ± 0.003)
93 to 121 (200 to 250) 0.53 (0.021)
122 to 149 (251 to 300) 0.61 (0.024)
150 to 176 (301 to 350) 0.69 (0.027)
177 to 204 (351 to 400) 0.76 (0.030)
205 to 232 (401 to 450) 0.84 (0.033)
>232 (450) 0.91 (0.036)
Notes:
1. For 3x1.5-13 and 3x2-13 at 3500 rpm add 0.08 mm (0.003 in.).
2. Rotation of bearing carrier from center of one lug to center of
next results in axial shaft movement of 0.1 mm (0.004 in.).
3. Reverse vane impeller set to cover, open impeller to casing.
5.4 Direction of rotation
5.4.1 Rotation check
It is absolutely essential that the
rotation of the motor be checked before connecting
the shaft coupling. Incorrect rotation of the pump, for
even a short time, can dislodge and damage the
impeller, casing, shaft and shaft seal. All Mark 3
pumps turn clockwise as viewed from the motor end.
A direction arrow is cast on the front of the casing as
shown in figure 5-13. Make sure the motor rotates in
the same direction.
Figure 5-13
5.4.2 Coupling installation
The coupling (figure 5-14) should be
installed as advised by the coupling manufacturer.
Pumps are shipped without the spacer installed. If
the spacer has been installed to facilitate alignment,
then it must be removed prior to checking rotation.
Remove all protective material from the coupling and
shaft before installing the coupling.
Figure 5-14
5.5 Guarding
Power must never be applied to the
driver when the coupling guard is not installed.
Flowserve coupling guards are safety devices intended
to protect workers from inherent dangers of the rotating
pump shaft, motor shaft and coupling. It is intended to
prevent entry of hands, fingers or other body parts into a
point of hazard by reaching through, over, under or
around the guard. No standard coupling guard provides
complete protection from a disintegrating coupling.
Flowserve cannot guarantee their guards will
completely contain an exploding coupling.
5.5.1 Clam shell guard - standard
The standard coupling guard for all Mark 3 pumps is the
“clam shell” design and is shown in figure 5-15. It is
hinged at the top and it can be removed by loosening
one of the foot bolts and sliding the support leg out from
under the cap screw. Note that the foot is slotted. The
leg can then be rotated upward and half of the guard
can be disengaged (unhinged) from the other.
