Installing The Mechanical Seal; Mechanical Seal Alignment - Xylem Goulds VIT Instrucciones De Instalación, Operación Y Mantenimiento

7. The stuffing box is shipped with both ports plugged.
If the discharge pressure is over 100 psi, remove the
plug on Port "A" and attach a bypass (relief) line. If
the discharge pressure is over 200 psi, remove the
plug on Port "B" and attach another bypass line.
8. Final adjustment of the stuffing box must be made
at pump start up. A properly packed stuffing box
should be loose enough to allow the shaft to be
turned manually. Also, packing must allow leak.
See page 24, Pump Start Up #5.
Do not over tighten packing or excessive
CAUTION
wear can occur on the shaft or sleeve.

INSTALLING THE MECHANICAL SEAL

Vertical turbine pumps are usually supplied with cartridge
type mechanical seals, shipped assembled - ready
for installation, when mechanical seals are supplied.
Instructions for installing mechanical seals are provided
by the seal manufacturer. Consult the seal manufacturer's
instructions (furnished with the seal) for information
on the type of seal used. Additionally, refer to factory
furnished outline drawing and seal piping schematic on
complex seal piping arrangements.
GENERAL REQUIREMENTS FOR INSTALL SEALS
1. Check surfaces at the face of the seal housing and at
the bottom of the seal housing to insure that they are
clean, flat and free of burrs. The face surface must be
smooth to form a good sealing surface for a gasket
or O-ring.
2. Check that shaft is smooth, and free of burrs, nicks
and sharp corners that could nick or cut the O-ring
or shaft packing. When further clean up is required,
protect by covering the inside of the pump seal
housing. Remove burrs, nicks and sharp corners by
using a strip of emery cloth over the shaft threads.
File threads around the keyway with a smooth mill
file or emery cloth. Sharp edges must be rounded.
3. Remove all chips and dust from the shaft area.
4. Check that all rotary unit parts of the seal fit over
the shaft. A pre-check may be made by removing the
O-ring(s) from the cartridge sleeve Inside Diameter
(ID) and then installing the seal on the shaft. Further
shaft clean up will be necessary when the seal will
not pass all the way into the seal housing.
5. Remove the seal after the pre-check and re-install
the sleeve O-ring(s).
6. Sparingly lubricate the shaft and sleeve ID with
the lubricant included with the mechanical seal or
recommended by the mechanical seal manufacturer.
The following lubricants may be used, for
water service, when no lubricant is supplied or
recommended by the mechanical seal manufacturer.
• Light oil (SAE #10 or 20)
• Dow Corning #4 Grease
• Silicone lubricant
• Wax or Clay
• Soapy water
Oil based lubricants will damage EPR / EPDM
elastomer O-rings. Silicone lube and soapy water are
safe for EPR / EPDM elastomer O-rings.
16
7. Install the O-ring or gasket, between the seal
housing and seal. Install the seal over the shaft and
ease it into position against the face of the seal box.
Take care when passing the sleeve and O-ring over
keyways or threads to avoid damaging the O-ring.
Do not bump carbon members against The
CAUTION
shaft as they may chip, crack or break.
8. Position seal gland on discharge head seal housing
and secure with capscrews (or nuts for studs)
provided. Tighten capscrews gradually and
uniformly in a criss-cross pattern, taking 2 or 3
passes.
Do not over tighten capscrews on gland.
CAUTION
This can distort seal seat and cause seal
failure.
9. Install all seal piping as required. Prior to making
final connections of sealing liquid pressurizing lines,
make sure the seal housing and all sealing liquid
lines are flushed free of dirt, scale and other particles
that would be abrasive to the sealing faces.
10. The Driver and Coupling must now be installed
per instruction. (See page 24 - INSTALLING
THE HOLLOW SHAFT DRIVER or page 26 -
INSTALLING THE SOLID SHAFT DRIVER).

MECHANICAL SEAL ALIGNMENT

CONCENTRICITY OF MOTOR SHAFT
1. Install the dial indicator
as shown, with the base
attached to the motor
support.
2. Rotate the motor shaft by
hand while you read the
dial.
3. Make sure that the runout
does not exceed NEMA
standards, 0.002 in (0.05
mm) maximum TIR.
4. If the indicator reads higher than 0.002 in (0.05
mm)TIR, loosen the four motor hold-down bolts
and relocate the motor on the motor base register.
5. Obtain the desired position.
6. Tighten the hold-down bolts and repeat the indicator
reading.
Note: Adding or removing shims between the motor
and the discharge head helps alignment in the
vertical direction. The motor may also have to be
adjusted in the horizontal direction for alignment.