VIBRATION is the typical cause of Sample Cooler failure.
VIBRATION is caused by two (2) conditions:
A. CAVITATION RESULTS whenever localized boiling occurs on the outside surface
of the hot heat transfer coil. Steam bubbles form on the shell side of the hot
coil surface and are swept into the main stream of the cooling water, where
they immediately condense and collapse. The collapsing bubbles generate
severe shock waves (i.e. vibrations) which can fatigue and ultimately fracture
the heat transfer coil.
CAVITATION IS CAUSED BY: (a) the cooling water FLOW RATE IS TOO LOW,
such that the water is OVERHEATED to its boiling point, and/or (b) the cooling
water OPERATING PRESSURE IS TOO LOW, such that the cooling water can
BOIL at too low a temperature.
CAVITATION CAN BE PREVENTED if (a) the cooling water and sample ows
are kept at the design conditions specied in WATERS literature, and (b)
the cooling water pressure is kept as high as possible (50 psig minimum
recommended). To avoid reducing the cooling water pressure in the shell side,
do any throttling at the cooling water OUTLET, never at the INLET.
B. EXCESSIVE COOLING WATER VELOCITY will vibrate the heat transfer coil, which
can fatigue and ultimately fracture the coil. To prevent coil failure, keep the
cooling water ow at the design conditions specied in WATERS literature.
REMEMBER: Throttling must be done at the cooling water OUTLET.
IF YOU HEAR VIBRATION OR RATTLING NOISES from the cooler, take corrective
action IMMEDIATELY to:
Eliminate vibration from cavitation by adjusting cooler so that:
a. Cooling water inlet valve is fully open.
b. Cooling water ow is per design condition.
c. Cooling water shell side pressure is as high as possible.
d. Sample ow is reduced if necessary.
Eliminate vibration from excessive velocity by throttling cooling water
ow to design conditions. Always throttle at the cooling water outlet.
Installation
1. Support the Waters Equipment W9150/W9250 Series sample cooler by its
bracket or by water lines only.
2. Provide a globe valve (not gate) in the COOLING WATER OUTLET LINE for
throttling purposes. (3/8" for Model W9000, ½" for Model W9100 series; ¾" for
Model W9200 series)
3. If it’s desired to isolate the cooler, provide a ¾" gate or ball valve (not globe) in
the COOLING WATER INLET line.
4. For shell side pressure relief, install a combination temperature/pressure relief
valve in the COOLING WATER INLET line.
5. Mount the cooler vertically.
6. Make connections to the cooling water connection and sample uid studs by
means of welding or with ttings, as appropriate.
Start-up and Operation
1. Open fully all cooling water lines. Verify that minimum specied cooling water
ow is occurring. If cooling water is untreated, its temperature rise should not
exceed 40°F, so as to minimize scaling.
2. When necessary, throttle cooling water ow by partially closing the globe
valve on the COOLING WATER OUTLET line. Any valve on the COOLING
WATER INLET must always be full open.
3. When possible and practical, shut o the sample uid when not taking a
sample so as to minimize scaling. This action is not necessary if the cooling
water is from a treated, closed loop supply.
Disassembly and Reassembly
1. For heavily scaled coolers, disassembly is easier by rst dissolving the scale.
Remove scale by circulating an oxalic acid cleaning solution through the
cooling water side.
2. Reuse original gaskets if not too old or if not overly compressed. After
reassembly, pressurize shell and visually inspect for water leaks. Replace those
gaskets that show visible leaks. Keep spare shell gaskets on hand for this need.
Model Gasket
W9150, W9155 WA170592
W9250, W9255, W9260, W9265 WA170593
3. During reassembly, retorque nuts as follows:
Model Ft-Lbs Torque
W9150, W9155 15-20
W9250, W9255, W9260, W9265 20-25
Customer Support
With proven sampling expertise since 1924, Sentry products and services
provide business operations the critical insights to optimize process control and
product quality. We deliver true representative sampling and analysis techniques
to customers around the globe, empowering them to accurately monitor and
measure processes for improved production efficiency, output, and safety.
Standing behind our commitments, we are determined to tackle any application,
anywhere.
We know that running an efficient operation isn’t easy. It requires thorough,
careful analysis of controlled, real-time data achieved through reliable, accurate,
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sampling, and measuring gas, liquid, slurry, powder, solids, steam, or water within
their production environments, our customers obtain the critical insights they
need to control and optimize their processes.
Yet, controlling your processes also means reliable customer support throughout
the life cycle of your equipment.
Customer Service—General information, warranty claims, order management.
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installation.
Technical Support—Troubleshooting, training, and technical manuals.
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consumables.
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with regularly scheduled maintenance.
www.sentry-equip.com/support.
