Api682

API 682
API 682 Short Guide
Most common plans and
operational information.
070911ShortGuide_en.indd 1 09.01.2008 16:42:15 Uhr

2
API 682
has emerged to become a worldwide accepted standard in
today`s refinery and hydrocarbon related applications.
EagleBurgmann offers a wide range of high quality mechanical
seals and supply systems which fully comply with this
standard.
From expert consulting and engineering up to modular
TotalSealCare®
service solutions for entire plants –
EagleBurgmann is your reliable partner for sealing technology.
Please ask also for our API poster, our detailed brochure 58E
and the API 682 seal selection software on CD.
Find your nearest contact at
www.eagleburgmann.com/world.
Important Note
Operating manuals and plant guidelines must be strictly
observed and are always to be followed prior to the
information given in this short guide. Before carrying out any
regular inspection or repair work, shut down system and make
sure the system is completely pressureless! Do not touch hot
surfaces! Use adequate temperature measuring device. Strictly
follow safety regulations!
Terms used in this short guide
Start-up procedures: assume that pump is reinstalled and put
into operation after overhaul.
Shut-down procedures: assume a stopping of the pump and
keeping the pump in standby mode.
Regular inspections are conducted on the normal operator tours.
Trouble-shooting describes the most common failures at
mechanical seals and supply systems and how to cure them.
Other causes, not mentioned in this guide, may be present –
however these must be evaluated by consulting EagleBurgmann.
Subject to change.

3
Connection codes on seal gland
acc. to API 682, 3rd edition
F = Flush
FI = Flush IN (only plan 23)
FO = Flush OUT (only plan 23)
D = Drain
Q = Quench
V = Vent
BI = Buffer/Barrier IN
BO = Buffer/Barrier OUT
LBI = Liquid Buffer/Barrier IN
LBO = Liquid Buffer/Barrier OUT
GBI = Gas Buffer/Barrier IN
GBO = Gas Buffer/Barrier OUT
CSD = Containment Seal Drain
CSV = Containment Seal Vent
Most common PID codes
for supply system instrumentation
PI = Pressure Indicator
TI = Temperature Indicator
LS = Level Switch
PS = Pressure Switch
LG = Level Gauge
PT/PIT = Pressure Transmitter/
Pressure Indicator Transmitter
TT = Temperature Transmitter
PCV = Pressure Control Valve
PSV = Pressure Safety Valve
= Valve normally open (NO)
= Valve normally closed (NC)
= Orifice
= Strainer

4
Media characteristics
Clean media is pumped at
high temperature.
Flushing is not desired or necessary.
Start-up procedure
No special procedures need
to be followed.
Shut-down procedure
to be followed.
Regular inspection
to be followed.
Seal chamber cooling or
heating and neck bush are
necessary, unless otherwise
specified. Dead end seal
chamber with no
circulation. Plugged
connections for possible
future circulation and
quench.
Plan 02

5
02111321,222331325253A53B53C54626572747576
Troubleshooting
to be followed.
Plan 02

6
For any moderatly clean and
warm media.
Start-up procedure
The seal chamber must be filled
with pumped media. If the seal
chamber is not self-venting
chambers, trapped gas must be
removed by venting. Check that
piping and the appropriate orifice is
installed correctly. If valves are
installed in the flush piping, they
must be open at all times and false
operation (e.g. accidental closing)
must be excluded.
Shut-down procedure
to be followed.
Regular inspection
Check for any leakage and
abnormal temperature gradient on
the flush line (e.g. a healthy flow
will display nearly equal
temperature distribution on the
total piping).
For general applications.
Product pumped clean,
good lubricating properties
and heat removal from the
mechanical seal.
Recirculation from pump
discharge through flow
control orifice to the seal.
Plan 11

7
111321,222331325253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal temperature
gradient on the flush piping.
Cause: Interrupted flow of flush
stream (valve is closed or piping/
orifice is clogged).
Solution: Open valves and secure
against accidental closing. Shut
down pump and check piping/orifice
for clogging.
Plan 11

8
For any moderatly clean and
warm media.
Start-up procedure
The seal chamber must be filled
with pumped media. Trapped gas
must be removed by thoroughly
venting the seal housing. On vertical
pumps a vent connection shall be
supplied at the highest point of the
seal chamber or seal housing.
Check that piping and the
appropriate orifice is installed
correctly. If valves are installed in
the flush piping, they must be open
at all times and false operation
(e.g. accidental closing)
must be excluded.
Shut-down procedure
to be followed.
Regular inspection
Check for any leakage and
abnormal temperature gradient on
the flush line (e.g. a healthy flow
will display nearly equal
temperature distribution on the
total piping).
Used where the seal
chamber pressure is at
discharge pressure (mainly
vertical pumps).
seal chamber through a
flow control orifice and
back to the seal.
Plan 13

9
1321,222331325253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal temperature
gradient on the flush piping.
Cause: Interrupted flow of flush
stream (valve is closed or piping/
orifice is clogged or gas is trapped
in the seal chamber of vertical
pumps).
Solution: Open valves and secure
against accidental closing. Shut
down pump, remove clogging from
piping or orifice. Vent seal chamber
thoroughly in vertical pumps.
Plan 13

10
Plan 21 = without strainer, Plan 22 = with strainer.
The media is near to its vapourisation point.
Media is pumped at high temperature.
Start-up procedure
The seal chamber must be filled with pumped media.
Trapped gas must be removed by thoroughly venting the
seal housing. Check that piping and the appropriate
orifice is installed correctly. The strainer must be clean
(plan 22). If valves are installed in the flush piping, they
must be open at all times and false operation (e.g.
accidental closing) must be excluded. The cooling
water supply must be connected, thoroughly vented
and operative.
Shut-down procedure
Keep cooling water supply open at high temperatures.
Regular inspection
Check for any leakage and abnormal temperature
gradient on the flush line (e.g. a healthy flow will
display nearly equal temperature distribution on the
total piping). Check cooling water temperature. Clean
strainer (plan 22) at regular intervals.
Used for hot applications or
where the temperature and
pressure in the seal chamber
is close to the vapour curve
of the product. Recirculation
from pump discharge through
a flow control orifice and
cooler into the seal chamber.
Plan 21 (22)

11
21,222331325253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal temperature gradient on
the flush piping.
Cause: Interrupted flow of flush stream.
The valve is closed or piping/orifice is clogged.
The strainer is loaded with deposits.
Solution: Open valves and secure against accidental
closing. Shut down pump, remove clogging from
piping or orifice. Clean strainer.
n Problem: Abnormal temperature rise in the cooling
water supply.
Cause: Cooling water stream is interrupted.
Solution: Open cooling water supply. Check if cooling
water piping is clogged, remove clogging.
Consider changing to plan 23 if possible.
Plan 21 (22)

12
Start-up procedure
seal housing. Piping shall be inclining upward and self
venting (no gas traps). Piping shall be arranged to
provide lowest possible flow resistance (direct lines,
avoid bends if possible, required bends with large
radius) If valves are installed in the flush piping, they
must be open at all times and false operation
(e.g. accidental closing) must be excluded.
The cooling water supply must be connected,
thoroughly vented and operative.
Shut-down procedure
Keep cooling water supply open
at high temperatures.
Regular inspection
gradient on the flush line (e.g. a healthy flow will
display nearly equal temperature distribution on the
total piping). Check cooling water temperature.
Used for hot liquid
applications or where the
temperature and pressure
in the seal chamber is
close to the vapour curve of
the product. Recirculation
by means of a pumping ring
in seal chamber through a
cooler and back to seal
chamber.
Plan 23

13
2331325253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal temperature gradient on the
flush piping.
Cause: Interrupted flow of flush stream.
The valve is closed or piping is clogged.
piping. If pumped media is heavily loaded with
solids, consider using alternative API plan.
n Problem: Abnormal temperature rise in the cooling
water supply.
Cause: Cooling water stream is interrupted.
Solution: Open cooling water supply. Check if cooling
water piping is clogged, remove clogging.
Plan 23

14
Media contains suspended solids.
For optimum performance, the density of solid particle
shall be more than twice that of the liquid.
Start-up procedure
seal housing. Check that piping and the cyclone
separator is installed correctly. If valves are installed in
the flush piping, they must be open at all times and
false operation (e.g. accidental closing) must be
excluded. Eventual orifices or obstacles in any of the
flow lines shall be removed as solid particle
will accumulate here or reduce the efficiency of the
cyclone separator.
Shut-down procedure
to be followed.
Regular inspection
gradient on the flush line (e.g. a healthy flow
will display nearly equal temperature distribution
on the total piping).
Used in applications with
suspended solids where the
SG of the particles are 2x
that of the liquid.
discharge through a
cyclone separator, clean
fluid to seal chamber,
contaminated fluid to
suction.
Plan 31

15
31325253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal temperature gradient on the
flush piping.
Cause: Interrupted flow of flush stream. The valve is
closed, piping or cyclone separator is clogged.
piping or cyclone separator. If an orifice is in the line
it is highly recommended to remove it. If the particle
density is less than twice that of the liquid or if the
piping gets clogged repeatedly, consider using an
alternative API plan.
Plan 31

16
Media contains suspended solids. Media has poor
lubricity. Media is pumped at high temperature. Media
is hazardous and/or harmful. Direct contact of the
media with the seal is not desired.
Start-up procedure
Check that piping, instrumentation and strainer or
orifice (if installed) is installed correctly. If installed, the
strainer or orifice must be clean. Open main valve for
external source of flushing liquid. The seal chamber
must be filled with flushing liquid. Adjust flow rate by
means of flow indicator and flow control valve as per
instructions. Secure main valve and flow control valve
from false operation (e.g. accidental closing).
Shut-down procedure
Shut down pump. Close main valve only after pump has
completely stopped, keep flow control valve open.
Regular inspection
Check for any visible leakage.
Check for temperature rise in the flush line at
point of entry into the seal.
Clean strainer when pump is shut-down.
Used when the product
being pumped does not
have good lubrication
properties, is dirty or
hazardous. Flush injection
of clean fluid into the seal
chamber from an external
source.
Plan 32

17
325253A53B53C54626572747576
Troubleshooting
n Problem: Temperature rise in the flush line near seal.
Cause: The flush stream is interrupted, heat
generated by the seal radiates into the flush line.
Solution: Open main valve, check flow rate indicator,
adjust flow rate with flow control valve. If this does
not cure the problem shut down pump and check
flush line for clogging. Clean strainer or orifice.
Plan 32

18
Media is hazardous and/or harmful.
Media may not be contaminated with barrier fluid.
Media may not contain suspended solids and should
have good lubricating properties.
Start-up procedure
Check that piping and the appropriate instrumentation
is installed correctly. Piping shall be inclining upward
and self venting (no gas traps). The TS vessel must be
at highest point. Piping shall be arranged to provide
lowest possible flow resistance (direct lines, avoid
bends if possible, required bends with large radius). Fill
the TS Vessel with fresh buffer fluid to be above MIN,
but well below MAX mark. Type and quality of the
buffer fluid shall be in accordance to the operation
manual. Trapped gas must be removed by thoroughly
venting the seal housing. Valves in the piping must be
open at all times and false operation (e.g. accidental
closing) must be excluded. Valve to flare or safe vent
line must be open. Do not pressurise the system.
Shut-down procedure
No special procedures need to be followed.
Keep cooling water supply open at high temperature.
Regular inspection
Check the correct fill level of the TS vessel (between
MIN and MAX mark). Exchange the buffer fluid at
regular intervals, as indicated in operation manual. A
change of buffer fluid colour is normal and does not in
itself indicate a seal failure. Check for any visible
leakage and abnormal temperature rise. The TI shall
display the specified temperature range. The PI shall
display a pressureless condition.
Used where the pumped
product is harmful /
hazardous and / or buffer
fluid may not contaminate
the product. External
reservoir at pressure below
seal chamber pressure
providing buffer liquid
forced circulation.
Plan 52

19
5253A53B53C54626572747576
Troubleshooting
n Problem: Abnormal rise of fluid level and increase
of pressure in TS Vessel.
Cause: The product side seal is having an increased
leakage.
Solution: Shut-down pump and have mechanical seal
inspected.
n Problem: Abnormal fall of fluid level in TS Vessel.
Cause: The atmospheric side seal is having an
increased leakage.
Solution: Shut down pump and have mechanical seal
inspected.
n Problem: The temperature indicator shows abnormal
rise of temperature in the buffer system.
Cause 1: The seal is overheating due to dry running
or increased friction.
inspected. Make sure seal is lubricated sufficiently
by pump media. If this cannot be assured, consider
changing to a system with pressurised barrier fluid.
Cause 2: Insufficient cooling by the water cooler in
the TS vessel.
Solution: Check cooling water supply.
n Problem: Temperature rise between buffer fluid out
at TS vessel and buffer fluid in at seal gland
connection.
Cause: Circulation of buffer fluid is interrupted, heat
generated by seal radiates into buffer fluid line.
Solution: Vent the buffer fluid system acc. to
instructions. Check circulation of buffer fluid.
Plan 52

20
Media contains suspended solids. Media has poor lubricity.
Media is hazardous and/or harmful. Leakage of media to
atmospheric side is not desired. The media is near to its
vapourisation point.
Start-up procedure
Fill the TS Vessel with fresh barrier fluid up to max. fill level
mark. The barrier fluid shall be in accordance to the operation
manual. Trapped gas must be removed by thoroughly venting
the seal housing. Check that piping and the appropriate
instrumentation is installed correctly. Piping shall be installed
in an upward inclined way, and self venting. Piping shall be
arranged to provide lowest possible flow resistance (direct
lines, avoid bends as far as possible, required bends with
large radius). Valves in the piping must be open at all times
and false operation
(e.g. accidental closing) must be excluded. Apply barrier
pressure at the specified value (usually 2 bar or min 10%
above stuffing box pressure). Start-up pump.
Shut-down procedure
Shut off pump. Keep TS vessel pressurised. Keep cooling
water supply open at high temperatures.
Regular inspection
Check the correct fill level of the TS vessel (between MIN and
MAX mark). Check correct barrier pressure. The PI shall display
the specified value. Check for any leakage and abnormal
temperature rise. The TI shall display the specified value. Check
for abnormal temperature gradient in circulation line.
Used for hot applications or
where products have low
pressure and are harmful/
hazardous. External
reservoir pressurized above
seal chamber pressure
providing barrier fluid to
mechanical seals. Forced
circulation.
Plan 53A

21
53A53B53C54626572747576
Troubleshooting
n Problem: Abnormal fall of fluid level in TS Vessel.
Cause: Either the product side or the atmospheric side seal
is having an increased leakage.
inspected.
n Problem: The temperature indicator shows abnormal rise of
temperature in the barrier system.
Cause 1: The seal is generating excessive heat due to dry
running or increased friction.
inspected. Make sure seal is lubricated sufficiently by
barrier fluid.
Cause 2: Insufficient cooling of the TS vessel. Improve
cooling capacity, or ensure cooling water circulation.
Solution: Check cooling water supply.
n Problem: Temperature rise between barrier out at TS vessel
and barrier in at seal gland connection.
Cause: Circulation of barrier fluid is interrupted, heat
generated by seal radiates into barrier line.
Solution: Vent the barrier fluid system acc. to instructions.
Check circulation of barrier fluid.
n Problem: Rise of barrier fluid level and simultaneous drop
of indicated pressure.
Cause: The barrier pressure has broken down.
Solution: Check barrier pressure supply line. Ensure supply
of sufficient barrier pressure.
Plan 53A A
N2A

22
Media is pumped at high temperature. Media is hazardous
and/or harmful. Leakage of media to atmospheric side is not
desired. The media is near to its vapourisation point.
Start-up procedure
Pre charge accumulator to the specified pressure. Fill up
circulation line acc. to instructions until barrier fluid exits at
the vent. Trapped gas must be removed from the system by
venting at highest point of the system. Check that piping and
the appropriate instrumentation is installed correctly. Piping
shall be installed in an upward inclined way. Cooler must be
higher than seal. Piping shall be arranged to provide lowest
possible flow resistance (direct lines, avoid bends as far as
possible, required bends with large radius). Valves in the
piping must be open at all times and false operation (e.g.
accidental closing) must be excluded. Open valve of
accumulator to apply barrier pressure. Start-up pump.
Shut-down procedure
Shut off pump. No special procedures need to be followed.
Regular inspection
Check correct barrier pressure. The PI shall be within the
specified value. Check for any leakage and abnormal
temperature rise or gradient. The TI shall be within the
specified value. If low pressure is indicated, refill system acc.
to instructions.
Used for applications where
products have high
hazardous. Pre-pressurized
bladder accumulator
provides pressure to
circulation system. Heat
removed by air/water heat
exchanger. Forced
circulation.
Plan 53B

23
53B53C54626572747576
Troubleshooting
n Problem: Low pressure is indicated by PI.
Cause: Barrier fluid level has dropped due to normal
leakage.
Solution: Refill barrier fluid acc. to instructions until correct
pressure is indicated.
n Problem: After refilling barrier fluid, pressure cannot be
maintained.
Cause: Abnormal leakage of mechanical seal.
inspected.
n Problem: Temperature rise in barrier system.
Cause: The seal is generating excessive heat or increased
friction due to dry running.
Solution: Achieve correct barrier fluid pressure by
maintaining the correct barried fluid volume.
Cause 2: Insufficient cooling at air/water coolers.
Solution: Ensure that cooling is sufficient by installing larger
coolers, ensure cooling water circulation (water cooler) or
make sure that air coolers are in a shaded area and free of
dust in hot climate.
n Problem: Temperature rise between barrier out at cooler
and barrier in at seal gland connection.
Solution: Vent the barrier fluid system acc. to instructions.
Plan 53B

24
Media has poor lubricity. Media is pumped at high
temperature. Media is hazardous and/or harmful.
Leakage of media to atmospheric side is not desired.
Start-up procedure
Fill up piston transmitter with fresh barrier fluid so that fill
indicator is between specified MIN and MAX marks.
Important: piston may not be below MAX mark (“on block”) to
avoid excessive pressure build-up. Trapped gas must be
removed by venting at highest point of the system. Check that
piping and the appropriate instrumentation is installed
correctly. Piping shall be installed in an upward inclined way.
Cooler must be higher than seal. Piping shall be arranged to
provide lowest possible flow resistance (direct lines, avoid
bends as far as possible, required bends with large radius).
Valves in the piping must be open at all times and false
operation (e.g. accidental closing) must be excluded. Start-up
pump. The reference line from the seal chamber will be
self-filling after start-up. Remaining air bubbles can be
tolerated.
Shut-down procedure
Shut off pump. No special procedures need to be followed.
When water cooler is used, keep cooling water supply open at
high temperatures.
Regular inspection
Check correct fill level of the barrier fluid. If piston reaches the
TOP mark, then fill level is LOW and vice versa. Check for any
leakage and abnormal temperature rise or gradient. The TI
shall be within the specified value. If a strainer is installed in
the reference line, keep clean.
Used for applications where
products have high
hazardous. Pressurization
by reference line from seal
chamber to a piston
pressure booster provides
pressurized barrier fluid to
circulation system. Forced
circulation.
Plan 53C

25
53C54626572747576
Troubleshooting
n Problem: The sight gauge shows that the piston is at top position.
Cause: Barrier fluid level is low, allowing the reference pressure
to move the piston upward.
Solution: Refill barrier fluid acc. to instructions until piston is
between MIN and MAX mark.
n Problem: Sudden rise of the piston over MIN mark. After refilling,
the level cannot be maintained, piston rises again.
Solution: Shut off pump and have mechanical seal inspected.
Refill barrier fluid.
n Problem: Piston is below MAX mark and is pressed “on block”.
Cause: After long pressureless standstill period, the piston may
drop due to gravity. The piston transmitter has been overfilled
with barrier fluid.
Caution: This is a critical operation condition! Pressure is
trapped! Due to thermal expansion critical pressures can be
reached causing seal and/or supply system destruction.
Solution: Open vent valve at supply system and allow pressure/
barrier fluid to escape. Piston will rise to a normal value. Take
caution when opening vent valve and observe safety instructions!
n Problem: Abnormal temperature rise in barrier system.
Cause: Insufficient cooling at air fin/water coolers.
Solution: Ensure that cooling is sufficient by installing larger
coolers, ensure cooling water circulation (water cooler) or make
sure that air fin coolers are free of dust and are installed in a
shaded area and in hot climate regions.
n Problem: Temperature rise between barrier out at cooler and
barrier in at seal gland connection, while the cooler itself is cool.
Cause: Circulation of barrier fluid is interrupted, heat generated by
seal radiates into barrier line.
Solution: Vent the barrier fluid system acc. to instructions or
check barrier fluid piping for clogging.
Plan 53C

26
Media is pumped at high temperature. Media is hazardous
and/or harmful. The media is near to its vapourisation point.
Leakage of media to atmospheric side is not desired.
Start-up procedure
Fill up barrier fluid tank with fresh barrier fluid acc. to
instructions. Check that piping and the appropriate
instrumentation is installed correctly. Piping shall be installed
in an upward inclined way. Piping shall be arranged to provide
lowest possible flow resistance (direct lines, avoid bends as
far as possible, required bends with large radius). Valves in
the piping must be open at all times and false operation
(e.g. accidental closing) must be excluded. Start-up barrier
fluid system and adjust barrier pressure acc. to instructions.
Start-up pump.
Shut-down procedure
Shut off pump.
Regular inspection
Correct fill level of the barrier fluid is surveyed by alarm
protection. Check filters and strainers at the barrier fluid
system acc. to instruction. Check bladder accumulator acc. to
instructions. Check for any leakage and abnormal temperature
rise or gradient. The TI shall be within the specified value.
Used in harmful/hazardous
applications. Pressurized
clean barrier fluid from an
external system. Fluid
circulation by an external
pump or pressure system.
Plan 54

27
54626572747576
Troubleshooting
n Problem: Barrier fluid level is at MIN value.
Cause: Barrier fluid level is low.
Solution: Refill barrier fluid acc. to instructions.
n Problem: After refilling, the level cannot be maintained.
Barrier fluid level drops rapidly.
Solution: Shut off pump and have mechanical seal
inspected. Refill barrier fluid.
n Problem: Abnormal temperature rise at seal.
Solution: Ensure that barrier fluid can circulated. Inspect
strainers and filters at barrier fluid system.
Plan 54

28
Media is pumped at high
temperature. Leakage of media on
atmospheric side may form
deposits, crystallise or oxidize.
Start-up procedure
Open valves for the nitrogen, steam,
water or whatever quench media is
used. If valves are installed in the
quench piping, they must be open
at all times and false operation (e.g.
accidental closing) must be
excluded. Adjust the desired flow of
quench media (hint: usually low
flow rates are sufficient).
Shut-down procedure
No special procedures need to
be followed.
Regular inspection
Check for abnormal leakage on
atmospheric side of seal.
Used to keep atmospheric
side of seal clean. External
source providing a
flow-through quench to
atmospheric side.
Plan 62

29
626572747576
Troubleshooting
n Problem: Seal is showing increased
leakage of pumped media on
atmospheric side.
Cause: Abnormal leakage of the seal.
Solution: Shut off pump and have
mechanical seal inspected.
n Problem: Seal is showing
increased leakage of quench media on
atmospheric side.
Cause: Atmospheric seal ring (throttle
bushing or lip seal) is leaking.
Solution: Shut off pump and check seal
ring for excessive wear.
Plan 62

30
Can be used with any media
which form a liquid leakage
(non-evaporating).
Start-up procedure
If valves are installed in the piping,
they must be open at all times
and false operation (e.g. accidental
closing) must be excluded.
Shut-down procedure
to be followed.
Regular inspection
to be followed.
Used for leakage detection
on single seal. Atmospheric
side leakage collection and
monitoring in external
vessel.
Plan 65

31
6572747576
Troubleshooting
n Problem: Level-high alarm has
been activated.
Cause: Abnormal leakage of the
mechanical seal.
n Problem: Level-high alarm has
been activated but seal is o.k.
Cause: The drain pipe of the system
is clogged or drain valve closed.
Solution: Remove clogging from
piping, clean orifice or open drain
valve.
Device to be located below pump shaftA
Plan 65
A
to drain

32
Media vapors are hazardous and/or harmful. Media
vapors are purged to avoid combustable mixtures.
Start-up procedure
If specified, leakage collection systems plan 75 or 76
may be installed in connection with plan 72. If valves
are installed in the piping, they must be open at all
times and false operation (e.g. accidental closing) must
be excluded. Check that piping and electrical equipment
of the gas panel is installed correctly. Make sure that
rotation direction of pump corresponds to rotation
direction of gas seal (at unidirectional gas seal). Open
main valve of buffer gas line. Adjust gas flow acc. to
instructions. Check pressure indicator: pressure shall
remain near 0 bar [g] if pressure builds up, a valve is
still closed. Start-up pump.
Shut-down procedure
Shut off pump.
Gas buffer supply may be shut off, if required.
Regular inspection
Check for abnormal gas consumption: flow indicator
shall display specified value. Check buffer gas pressure:
it should be near 0 bar [g]. Check filter and replace
filter elements at regular intervals (acc. to instructions).
Applicable with
hydrocarbons, normally
used in conjunction with
plan 75 or plan 76.
Externally supplied gas
buffer (pressure lower than
seal pressure). Buffer gas
used to dilute seal leakage.
Plan 72

33
72747576
Troubleshooting
n Problem: High level alarm of leakage
collection system plan 75.
Cause: High liquid leakage of product side
mechanical seal.
n Problem: High pressure alarm of vapour
recovery system plan 76.
Cause: High gas leakage on product side
mechanical seal.
n Problem: After start-up the pump
runs in reverse mode.
Cause: After installation, the pump has been
connected in reversed polarity.
Solution: Connect pump in correct polarity.
In case of unidirectional seal, have seal
inspected for damage.
n Problem: Pressure indicator in gas supply system
shows pressure increase.
Cause: The valve to the flare line is closed or
orifice is clogged.
Solution: Open valve to flare line, make sure the
orifice is clean.
Plan 72
A B
C
connect to plan 75A connect to plan 76B N2C

34
Media has poor lubricity. The media is near to its
vapourisation point. Media is hazardous and/or harmful.
Media shall be free of solids.
Start-up procedure
If valves are installed in the piping, they must be open
at all times and false operation (e.g. accidental closing)
must be excluded. Check that piping and electrical
equipment of the gas panel is installed correctly. Make
sure that rotation direction of pump corresponds to
rotation direction of gas seal (at unidirectional gas
seal). Open main valve of barrier gas line. Set optimum
barrier pressure to be above product pressure acc. to
instructions. Adjust the set points of instruments acc. to
instructions. Start-up pump.
Shut-down procedure
Shut off pump. Keep barrier gas supply open.
Regular inspection
Check for any abnormal gas leakage in piping (use
adequate gas leak detecting device such as bubble
spray etc.). Check for abnormal gas consumption: flow
indicator shall display specified value. Check barrier
pressure: PI shall display specified value. Check filter
and replace filter elements at regular intervals (acc. to
instructions).
Used in applications where
the product is harmful/
hazardous. Externally
supplied barrier gas used to
positively prevent process
fluid from leaking to
atmosphere.
Plan 74

35
747576
Troubleshooting
n Problem: Abnormally high gas consumption.
Cause: High leakage of mechanical seal or
leaking piping.
Solution: Shut off pump and inspect the seal,
check piping.
n Problem: Abnormally low gas consumption.
Cause 1: Barrier gas supply is insufficient.
Solution: Check barrier gas supply source. Ensure
all valves are fully open. Check filter and
replace filter element if necessary.
Cause 2: Seal faces are running in contact.
Solution: Have gas seal inspected.
n Problem: After start-up the pump runs in reverse mode.
Cause: After installation, the pump has been connected
in reversed polarity.
Solution: Connect pump in correct polarity. In case of
unidirectional seal, have seal inspected for damage.
N2A
Plan 74
A

36
Media leakage of product side seal
is liquid.
Start-up procedure
The plan 75 is commonly used in
connection with plan 72, where
leakage of the seal is liquid. Check
that piping is installed correctly.
Open valve of the flare line. Close
valve of the liquid drain line.
Start-up pump.
Shut-down procedure
Shut off pump. Keep flare line open
and drain line closed.
Regular inspection
Check liquid level through sight
glass or level indicator. The level
shall be between MIN and MAX
mark. Check position of valves.
Flare line must be open, liquid drain
must be closed. If high level alarm
is triggered, drain the system by
opening liquid drain line. Close
valve afterwards.
Application when pump
fluid condenses at ambient
temperatures. Containment
seal chamber drain for
condensing leakage.
Plan 75

37
7576
Troubleshooting
n Problem: After drain, the liquid
leakage collection system refills
quickly. Alarm is triggered after a
short interval.
Cause: Abnormal leakage of
mechanical seal
Solution: Shut off pump and inspect
the seal.
n Problem: Liquid leakage at
atmospheric side containment seal.
Cause 1: Both valves to flare and
drain are closed. Liquid leakage has
filled entire seal and leakage
collection system.
Cause 2: The product side seal has
increased leakage.
Solution: Have mechanical seal
inspected, make sure valves are in
correct position.
Device to be located below pump shaftA
Plan 75
A
to drain
to flare

38
Media leakage of product side seal
is evaporated.
Start-up procedure
The plan 76 is commonly used in
connection with plan 72, where
leakage of the seal is vapour. Check
that piping is installed correctly.
Open valve of the flare line.
Start-up pump.
Shut-down procedure
Shut off pump.
Keep flare line open if possible.
Regular inspection
The drain valve of the leakage
collection system can be opened
occasionally to check for any liquid
condensate. The system does not
require regular maintenance.
Application where pump
fluid does not condense at
ambient temperature.
Containment seal chamber
drain for non-condensing
leakage.
Plan 76

39
76
Troubleshooting
n Problem: The high pressure alarm
is triggered.
Cause: Abnormal leakage of
mechanical seal.
Plan 76
to flare

Burgmann Industries
GmbH & Co. KG
Aeussere Sauerlacher Str. 6-10
D-82515 Wolfratshausen
Phone +49(0)8171/23-0
Telefax +49(0)8171/23-1246
www.eagleburgmann.com
APISGE/E1/2.000/11.07/9.7.1©EagleBurgmannMarketingCommunicationsGermany
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