Seal Installation

Corporate Training Department
Prepared by Neeraj Patade
Seal Installation Procedure

Mechanical seal is a precision engineering product.
Its satisfactory performance and life depends upon , to a great extent ,
maintaining the pumps in the good condition.
Time spent in checking the equipment prior to seal installation

has proved to be a sound maintenance practice to prevent
premature seal failures and to keep maintenance expenses at
the minimum.
Corporate Training – EagleBurgmann India Prepared by : Surajjit Rayy © EagleBurgmann 2009 27th August
TYPICAL BACK PULL OUT PUMP

HORIZONTAL SPLIT CASING PUMP

RADIAL SPLIT MULTISTAGE PUMP

BARREL CASING MULTISTAGE PUMP
TYPICAL CENTRIFUGAL PUMP
1. SUCTION
2. IMPELLER
3. DISCHARGE
4. STUFFING BOX
5. SHAFT
6. GLAND PACKINGS
7. GLAND PUSHER
8. BRGS. & HOUSING
AREA TO BE SEALED
Shaft Packing Seal ring Seat / Mating Ring
Gland
Compression Unit
Shaft
Stuffing box
Compression Packing Replaced with Mechanical Seal

Check Points before Mechanical Seal

installation:
Process Checks
Equipment Checks
¾ D i m e n s i o n a l C h e c k s
¾ C o n d i t i o n C h e c k s
The following Actual Process Parameters must be cross
Checked with the data mentioned in the Drawing
before seal installation.
Suction Pressure
Discharge Pressure
Vapour Pressure
Temperature
Viscosity
Specific gravity
Nature of the liquid
Slurry Content
pH value
RPM
EQUIPMENT CHECK:
The majority of the pump manufacturers incorporate a sound

Engineering features while manufacturing the pumps.
The Pumps are made enough rouged and of dependable design to ensure a
long trouble free life.
But still it is recommended to check the following condition of the

equipment prior to seal installation.
Dimension Checks
Condition Checks (mechanical parameters)

All of the following dimensions needs to be cross checked with
the dimensions mentioned on the GA drawing.
Stuffing Box face condition

EQUIPMENT CHECK
Stuffing box depth
Stuffing box bore diameter
Stuffing box gland piloting ID or OD
Shaft diameter
Shaft step OD at impeller end & Shaft Key dimensions for hook sleeve design.
Sleeve total length and shaft impeller step to end dimension.
No. of gland bolts ,size ,their orientation and projection.
Throat bush ID
Dimension Checks
To understand the worthiness of the equipment and to ensure sound
performance of equipment fitted with a mech. Seal, following checks are
Equipment condition Checks
mandatory:
¾ SHAFT RUN OUT
¾ SHAFT AXIAL FLOAT
¾ SHAFT RADIAL LIFT
¾ STUFFING BOX SQUARNESS
¾ STUFING BOX CONCENTRICITY
Shaft run out
THE SHAFT RUNOUT SHOULD NOT EXCEED MORE THAN 0.08 MM TIR MAX.
Shaft Axial Float / End play
THE FLOAT SHOULD BE BETWEEN 0.02 MM TO 0.12 MM TIR MAX.
Shaft Radial Lift or Whip
THE SHAFT WHIP SHOULD BE BETWEEN 0.05 MM TO 0.08 MM TIR MAX.
Stuffing box Squreness
THE SQUARNESS SHOULD NOT EXCEED MORE THAN 0.12 MM TIR MAX.
Stuffing box Concentricity
THE CONCENTRICITY SHOULD NOT EXCEED MORE THAN 0.08 MM TIR MAX.
Minimum Stuffing box bore requirement
AGITATOR ASSEMBLY
Motor
Coupling
Gear Box
Mechanical Seal Lantern
Pad plate
CHECK POINTS IN AGITATOR ASSEMBLY
SQUARNESS
RUNOUT &
DEFLECTION
CONCENTRICITY
Run out, Squarness, Concentricity – The standard max.value is 0.08 mm, but
considering the special features of seals it can be up to 0.5 mm or as mentioned on
drawing.
Problems due to improper Equipment conditions
EXCESS End Play
¾Shaft Sleeve fretting.
¾Over compression / Under compression of the seal.
¾Chattering or chipping of the Carbon face.
EXCESSIVE RADIAL LIFT/ WHIP & RUN OUT

¾Pump vibration.
¾Excessive wear of mating faces.
¾Wobbling of Seal faces
¾Throttle bush, throat bush & impeller wear ring seizing.
EXCESSIVE SQUARNESS
¾Face misalignment
¾Wobbling of Seal.
¾Drive pin wear.
EXCESSIVE CONCENTRICITY
¾Affects hydraulic loading of the seal faces.
¾Damage/ rubbing of mating ring on sleeve.
Preparation for seal installation
¾Keep the area clean.
¾Remove all burrs and sharp edges from the shaft or sleeve including sharp edges
on keyways and threads.
¾Worn shaft or sleeves to be replaced.
¾Check the seal chamber / stuffing box bore and stuffing box face to ensure they
are clean and free from burrs.
¾Shaft and sleeve should be oiled lightly prior to seal installation to allow the seal
parts to move freely.
NO OIL SHOULD BE USED FOR EPR O RINGS.
Preparation for seal installation
¾Do not use HAMMER.
¾Open the seal packets just before seal installation.
¾Keep the hands clean.
¾Use soft tissue paper for cleaning seal components.
¾Wipe the seal faces and apply clean oil film.
Seal Operating length Setting - MARK THE REFERENCE LINE
Seal Operating length Setting - MEASURE THE DISTANCE OF MARK FROM THE SHAFT STEP
Seal Operating length Setting - FOR INSIDE MOUNTED SEAL WITH RAISED MATING RING
SETTING LENGTH
OL A
REF. MARK
SETTING LENGTH= (REF.MARK - A) – Operating Length

Seal Operating length Setting - FOR INSIDE MOUNTED SEAL WITH RECESSES MATING RING
SETTING LENGTH
OL A
REF. MARK
SETTING LENGTH= (REF.MARK + A) – Operating Length

Seal Operating length Setting - FOR OUTSIDE MOUNTED SEAL
SETTING LENGTH
A OL
REF. MARK
SETTING LENGTH= (REF.MARK + A) + Operating Length

Installation of Cartridge seal
Cartridge seal
Corporate Training Department

Seal Installation

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Corporate Training Department

Prepared by Neeraj Patade

Seal Installation Procedure

Time spent in checking the equipment prior to seal installation

Seal Installation Procedure

TYPICAL BACK PULL OUT PUMP

HORIZONTAL SPLIT CASING PUMP

Seal Installation Procedure

RADIAL SPLIT MULTISTAGE PUMP

Seal Installation Procedure

BARREL CASING MULTISTAGE PUMP

Seal Installation Procedure

TYPICAL CENTRIFUGAL PUMP

Compression Packing Replaced with Mechanical Seal

Check Points before Mechanical Seal

The majority of the pump manufacturers incorporate a sound

But still it is recommended to check the following condition of the

 Condition Checks (mechanical parameters)

 Stuffing Box face condition

 Stuffing box depth

 Stuffing box bore diameter

 Stuffing box gland piloting ID or OD

 Sleeve total length and shaft impeller step to end dimension.

 No. of gland bolts ,size ,their orientation and projection.

¾ SHAFT RUN OUT

¾ SHAFT AXIAL FLOAT

¾ SHAFT RADIAL LIFT

¾ STUFFING BOX SQUARNESS

¾ STUFING BOX CONCENTRICITY

Shaft run out

Shaft Axial Float / End play

THE FLOAT SHOULD BE BETWEEN 0.02 MM TO 0.12 MM TIR MAX.

Shaft Radial Lift or Whip

THE SHAFT WHIP SHOULD BE BETWEEN 0.05 MM TO 0.08 MM TIR MAX.

Stuffing box Squreness

Stuffing box Concentricity

Mechanical Seal Lantern

EXCESSIVE RADIAL LIFT/ WHIP & RUN OUT

¾Worn shaft or sleeves to be replaced.

NO OIL SHOULD BE USED FOR EPR O RINGS.

¾Do not use HAMMER.

¾Open the seal packets just before seal installation.

¾Keep the hands clean.

¾Use soft tissue paper for cleaning seal components.

¾Wipe the seal faces and apply clean oil film.

SETTING LENGTH= (REF.MARK - A) – Operating Length

SETTING LENGTH= (REF.MARK + A) – Operating Length

SETTING LENGTH= (REF.MARK + A) + Operating Length

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Condition Checks (mechanical parameters)

Stuffing Box face condition

Stuffing box depth

Stuffing box bore diameter

Stuffing box gland piloting ID or OD

Sleeve total length and shaft impeller step to end dimension.

No. of gland bolts ,size ,their orientation and projection.