![Alfa Laval SRU series Скачать руководство пользователя страница 13](http://html1.mh-extra.com/html/alfa-laval/sru-series/sru-series_instruction-manual_2895192013.webp)
4 Installation
This page is not applicable for ATEX applications.
For ATEX application see ATEX addendum
4.3
Flushing seal arrangement and pre-start up checks
Step 1
A flushed seal arrangement is fitted in order to cool or clean the seal area.
It is important that:
-
The flush is correctly connected (see below).
-
A compatible flushing fluid is used and supplied at the correct pressure and flow rate (see Step 5).
-
The flush is turned on at the same time/prior to starting the pump, and turned off at the same time/after stopping the pump.
Step 2
Connecting the flush
The following equipment is strongly recommended when using a flushing system:
-
Control valve and pressure gauge, to enable the correct flushing pressure to be obtained and monitored.
-
Isolation valve and check valve, so that the flush can be turned off, and to stop any unwanted substances flowing in
the wrong direction.
-
A method of visibly indicating flushing fluid flow.
Step 3
Flushing arrangements in principle
Flush outlet
Flush outlet
Link
pipe
Flush intlet
Flush inlet
Serial piping
Parallel piping
Step 4
Flushing fluid
The choice of flushing fluid is dependent upon the fluid being pumped and duty conditions i.e. pressure and temperature. Usually
water is used for cooling or flushing water soluble products. For both single and flushed mechanical seal arrangements the
temperature of flush media should never allowed to exceed the maximum temperature of the pumped media. For advice on
selecting a suitable flushing fluid please contact pump supplier.
Step 5
Flushing pressure and flow rate
Single flushed mechanical seal 0.5 bar (7 psi) maximum. Any further increase in pressure will result in lip seal failure. Double
mechanical seal/flushed packed gland 1.0 bar (14 psi) higher pressure than the discharge of the pump. If the discharge
pressure fluctuates set the pressure to suit maximum condition.
The flushing flow rate must be adequate to ensure that the temperature limitation of the seals is not exceeded. Contact your
pump supplier for further information on the recommended flow.
Minimum flow rate required per shaft seal is 30 l/hr
Step 6
Pre-start up checks
-
Check the pipework system has been purged to remove debris.
-
Check all obstructions have been removed from pipework and pump.
-
Check pump connections and pipework joints are tight.
-
Check lubrication levels are correct.
-
Check seal flushing is connected if applicable.
-
Check all safety guards are in place.
-
Check that inlet and outlet valves are open.
13
Содержание SRU series
Страница 1: ...ESE00693 EN14 2017 09 Original manual Instruction Manual Rotary Lobe Pumps SRU Range ...
Страница 2: ......