
Operation Manual
8
Jetstream 3000/3600/4200
Bareshaft Pump Installation
Guidelines
Models
The Jetstream UNx bareshaft pump is available in
three horsepower ranges and three pressure ranges
– 15,000 psi, 20,000 psi, or 40,000 psi and can be
supplied with an optional geardrive. The geardrive is
available in four different gear ratios to support die-
sel engine or electric motor input speeds. Both styles
can be supplied left hand drive or right hand drive
(as viewed from FE) and the geardrive model’s input
shaft can also be clocked to five different locations.
The geardrive unit requires inline drive with flexible
coupling***. The standard unit can be inline or belt
driven via pulleys exerting a side load on the crank-
shaft. All Jetstream powerends have a preferred
rotation direction (top of crankshaft towards the fluid
end) that is marked on the casting. However reverse
rotation operation is allowed with the addition of
optional reverse rotation oil scrapers. The geardrive
requires a clockwise input rotation direction.
3000 series 150 hp max
600 rpm max
3600 series 175 hp max
550 rpm max
4200 series 325 hp max
518 rpm max
Water Supply
The 15K and 20K versions can be gravity fed (water
level 3’ minimum above the manifold suction inlet).
The 40K version requires 40 psi minimum supply
pressure at full pump speed to operate. All fluid ends
have a maximum inlet supply pressure of 75 psi.****
The supply water should be clean and cold. The
maximum allowed inlet water temperature is 125°F.
Ideally the water should be filtered to 25 micron (3
micron for 40K) and 40-80°F for maximum packing
life. Severly reduced packing life will be encountered
with warmer water. The inlet supply hose should be
3” ID if gravity fed and 2” ID if pressure fed. Jet-
stream recommends oilfield suction hose as it has
proven to be durable with a relatively small bend
radius. The hose should be as short and straight as
possible with no additional fittings (elbows) - espe
-
cially important with gravity fed setup. If bends are
required it is best to bend the hose without the use
of elbows.
The plunger packing is lubricated with the supply
water and is not adjustable on normal gravity fed
15K/20K systems. On 40K and pressure fed sys-
tems, the lube harness needs to be equipped with
needle valves to allow adjustment of the lube water
flow. The cooling water should exit the rear of the
gland nuts with a steady stream (more than a drip)
but not enough to be splashed onto the pony rod
during operation.
Pulsation
Positive displacement pumps create pulsation in
the high pressure discharge line. For this reason,
it is extremely important to utilize flexible hoses
(ie rubber, thermoplastic) in lieu of rigid piping to
minimize water hammer and vibration. If rigid piping
is necessary, it should not be installed at the pump
discharge. A 25’ or 50’ section of hose should be
installed at the pump discharge. This length can be
coiled and hung for space savings. A high pressure
pulsation damper may be beneficial in some cases.
Short on/off cycles at high pressure will create the
largest spikes of pressure and require care to damp-
en. Flow controls or other means to slow the abrupt
change of pressure will smooth these pulsations.
Lubrication
The powerend is lubricated via 80W90 gear oil (non
detergent only) in the sump of the housing. The
journal bearings, crossheads, and connecting rod
bushings are supplied oil via gravity from a collection
trough above the crossheads. The powerend has a
level requirement to ensure oil lubricates the crank-
shaft tapered roller bearings and stays in contact
with the crankshaft. Front to back level specification
is 7° and side to side level is 10°. Both a low oil level
shutdown and a high oil temperature shutdown are
available as options.
The powerend oil has a recommended maximum
temperature of 190°F and can be comfortably run
in most environments. Extremely hot or cold envi-
ronments (i.e. Middle East, Canada) may require oil
cooler or synthetic oil. Contact Jetstream Engineer-
ing for assistance.
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