Operating manual X9 Series metering pumps
File: UT-4336 – Rev.0 Copyright © - OBL Metering pumps - All rights reserved Page 29
GB
Diaphragm working life exceeds 40.000 operating hours. The most likely cause of rupture is usually linked to the nature of the handled
fluid (abrasive, solid parts in suspension, etc.).
8.2.1
Hydraulic oil system change
If hydraulic oil system contains sludge or is contaminated, replace as follows:
- remove the tank cover (pos.94) and suction all oil with by means of a large syringe
- remove and clean the oil filter (pos.49) without disassemble it in its components, then reassemble it
- clean and dry the inside of the tank. Then pour the new hydraulic oil up to the level indicator (pos.64)
- Clean and reassemble the tank cover (pos.94)
Change oil also in relation to pump use and as illustrated in the following table.
FREQUENCY OF
CHANGES IN
HOURS
HANDLED FLUID MAXIMUM TEMPERATURE
(*) OPERATION
≤+70 °C +70 °C ÷ +80 °C +80 °C ÷ +90 °C +90 °C ÷ +100 °C
20.000 10.000 2.000 1.000 12h / 24h
20.000 10.000 1.000 500 24h / 24h
(*) Consider as part of pump "OPERATION" a waiting period with warmed fluid temperature in the pumphead.
The following tables shows the quantities and types of oil suggested for X9 pump hydraulic systems:
OIL MAKE OIL TYPE/NAME NOTES PUMP TYPE QUANTITY (litres)
SHELL VITREA OIL 32 (1) LY-LYH 10÷50 0,4
ESSO NURAY 32 (1) LK 20÷40 0,5
OLEOTECNICA PHARMA 30 (2) LK 50÷80 1,3
FUCHS RENOLIN FOOD CLP 220 (3) LN-LP 25÷50 1,3
(1) Pure mineral oil for hydraulic systems (OBL standard) LN-LP 65÷80 2,5
(2) PHARMA oil (used only if specifically request) LN-LP 100÷120 3,5
(3) FDA certified food oil (used only if specifically request)
8.2.2
Diaphragm rupture signaling
The diaphragm rupture detector, located directly on the pumphead, allows the user to know diaphragm conditions.
The "standard" version is a pressure gauge which, during normal pump operation, must indicate "zero (0) pressure",
confirming that the diaphragms are intact.
Depending on the version, signaling is carried out by means of:
- a pressure variation (standard detector with pressure gauge)
- electrical contact (detector supplied upon request with microswitch, pressure-switch or pressure transmitter)
Signaling can be caused by:
- a presence of air between the two diaphragms
- rupture in one of the two diaphragms
The rupture of one diaphragm does not always prevent the pump to continue to supply flowrate correctly.
Within a short time, the maintenance supervisor must however provide a check/replace the diaphragm.
8.2.3
Diaphragm condition check
Proceed as follows to verify if the diaphragm is broken:
- find the sectional drawing of the diaphragm rupture detector installed on the pump
- release the pump from suction and discharge pipeline, and clean adequately
- hermetically seal the discharge valve unit and introduce compressed air (6-8 bar) in the pumphead by means of the suction
connection. The pressure will compress the two diaphragms together
- "SLOWLY" unscrew and remove the rupture detector locking screws to vent any internal pressure
ATTENTION DANGER ! PROTECT PROPERLY FROM EJECTIONS OF PRODUCT UNDER PRESSURE !
- check for any possible liquid leakage from the detector, checking whether said leakage is OIL or else HANDLED PRODUCT
- if nothing comes out, the diaphragm can be considered intact. See "Diaphragm rupture detector resetting"
- if comes out OIL or HANDLED PRODUCT, replace the diaphragm. See "Diaphragm replacement"
8.2.4
Diaphragm replacement
Since this requires pumphead disasembling (hydraulic system) BEFORE operating see "Diaphragm condition check".
ATTENTION: The removal of the pumphead causes a loss of hydraulic oil and failure of the whole system !
Carefully assess the actual need for such operation and prepare for oil collection.
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