Goulds Pumps SRL Series - IOM - Manual (Page 16)

Page 2
GENERAL INFORMATION
LUBRICATION
All horizontal SRL, SRL-C, and SRL-XT pumps are designed for oil lubrication
with anti-friction bearings. Before starting the pump flush the cylinder or frame
liner with oil to remove any grit or dirt that may have entered the bearing housing
during shipment or erection. Then refill with the proper lubricant to the operative
level as shown by a line of the oil sight glass.
Experience shows that oils meeting the following specifications will provide
satisfactory lubrication. These oils can be furnished by all major oil companies. It is
the responsibility of the oil vendor to supply a suitable lubricant.
1) Saybolt viscosity at 100° F . . . . . . . . . . . . . . . 300 SSU - 650 SSU
2) Saybolt viscosity at 210° F . . . . . . . . . . . . . . . . 50 SSU - 70 SSU
3) Viscosity index . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 - 100
4) API gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 - 30
5) Pour point . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5° F - 25° F
6) Flash point . . . . . . . . . . . . . . . . . . . . . . . . . . 430° F - 485° F
7) Additives . . . . . . . . . . . . . . . . . . . . rust and oxidation inhibitors
The oil should be well refined, premium to heavy duty type (API), filtered mineral
oil with non-foaming characteristics. It must be free from water, sediment, resin,
soaps, acid and fillers of any kind. It should also contain a protective agent against
rust and wear. An SAE-20-30 grade with the above characteristics is
recommended.
In installations with moderate temperature changes, humidity and dirt, the first oil
change should be made after approximately 160 hours of operation. The oil
should be inspected at this time to determine the operation period before the next
oil change. Oil change periods may be increased up to 2000-4000 hours based on
an 8000 hour year. Check the oil frequently for moisture, dirt or signs of
“breakdown.”
The bearings are also protected with a grease seal located in the bearing cover. A
grease fitting is provided to fill cavity in the bearing cover with grease to prevent
foreign matter from entering the bearing housing.
We recommend the use of a 30°-300° F (-1°-149° C) temperature range grease of
about 1500 SSU at 100° F (38° C) (base oil viscosity). The grease should be of
high quality, have shear stability, controlled adhesiveness and rust preventive
additives.
CAUTION
DO NOT OVER OIL as this causes the bearings to run hot and fail
prematurely. The maximum desirable operating temperature for ball bearings
is 180° F (82° C). Should the temperature of the bearing frame exceed 180° F
(82° C) (measured by thermometer), shut down pump to determine the cause.
Oils from different supplier should not be mixed.
STUFFING BOX
As standard construction, the pump will be supplied with stuffing box
arrangement “A” for normal service. Where low dilution service is required,
stuffing box arrangement “B” can be supplied upon request.
It is absolutely essential with any packed stuffing box to keep contaminants in the
pump liquid from entering the packing space. These contaminants will cause
severe abrasion or corrosion of the shaft sleeves, rapid packing deterioration, and
can even plug the stuffing box flushing and lubrication system, causing the
packing to run hot.
The stuffing box must be supplied at all times with a source of clean, clear water
to flush and lubricate the packing. The sealing water should be supplied at about
10 psig above the discharge pressure of the pump, in quantities shown in Table 1.
Even when the pump is shut down, the sealing water should be left on unless the
casing is relieved of the discharge pressure by isolating it from the static head in
the discharge pipe.
The stuffing box should weep slightly, and only clear solution should appear at
the gland. Care must be taken when packing and repacking the stuffing box to cut
the packing into proper lengths (square ends just short of meeting). Install them
with staggered joints, and place each ring in position before installing succeeding
ring. Do not put too much tension on gland bolts. The standard packing is made
from resilient non-asbestos fibers encapsulated by a protective TFE coating with
break-in lubricant.
A soft well-lubricated packing reduces stuffing box resistance and prevents
excessive wear on the shaft or shaft sleeve. Many brands of packing have the
desired qualities. Those listed below should be regarded as typical rather than
specific recommendations for replacement.
1. Paperpack 5801 Garlock Packing Company
2. #1335 John Crane Canada Inc.
3. #5059 Anchor Packing Company
TABLE 1 Gland Water Requirements
Pump Size FLOW NPT Conn.
SRL/SRL-C SRL-XT USGPM Inches
2x2x10 1 3/8"
3x3x10 2 3/8"
5x4x14 4 3/8"
5x5x14 4 3/8"
6x6x15 6 3/8"
8x6x18 9 3/8"
10x8x21 6x6x21 12 3/8"
12x10x25 8x8x25 14 1/2"
14x12x29 10x10x28 16 1/2"
16x14x34 14x12x36 20 3/4"
20x18x40 25 3/4"
Notes:
Values given above are for new pumps with new parts, handling clear water at 85° F (30° C).
Values given are for "high dilution" arrangement ("A"). For "low" dilution arrangement ("B")
reduce quantities by 50%.
The seal water should be supplied at about 10 PSI above the discharge pressure of the pump.
When designing the gland system, size it for 50% to 100% higher flows to allow for wear in
the stuffing box bushing and increase flow due to fluctuations in the pressure differential
between gland water systems and pump discharge pressure.