Sentry X43 Instruction manual

Original Instructions
Installation, Operation
& Maintenance Manual
Sentry XC Boiler Blowdown System
Heat Exchangers
S-SW-IOM-0243-3 8-16

2 Sentry Equipment Corp
Do not install, maintain, or operate this equipment without reading,
understanding, and following the appropriate Sentry Equipment Corp
instructions. Otherwise, injury, damage, or both may result.
Copyright
© 2016 by Sentry Equipment Corp. All rights reserved. All product and company names
are property of their respective owners. This document contains proprietary information.
No part of this document may be photocopied or reproduced without the prior written
consent of Sentry Equipment Corp.
Limit of Liability
Sentry Equipment Corp, its employees, agents, and the authors and contributors to this
document specically disclaim all liabilities and warranties, express or implied (including
warranties of merchantability and tness for a particular purpose), for the accuracy,
currency, completeness, and/or reliability of the information contained herein and/or
for the tness for any particular use and/or for the performance of any material and/or
equipment selected in whole or part with the user of/or in reliance upon information
contained herein. Selection of materials and/or equipment is at the sole risk of the user of
this publication.
Note
The information contained in this document is subject to change without notice.
Table of Contents
Safety Information ......................... 3
General Safety Precautions ................. 4
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation.................................. 8
Maintenance ............................... 11
Parts List................................... 14
Standard Warranty ......................... 19
Customer Support.......................... 19

Sentry XC Boiler Blowdown System 3
Safety Information
Please read the entire manual before attempting to unpack, set up, or operate this
product. Pay careful attention to all Warnings, Cautions, and Notes. Failure to do so could
result in serious personal injury and/or equipment damage.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard shall be
used.
Definitions
DANGER indicates a hazardous situation
which, if not avoided, will result in death or
serious injury.
WARNING indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE is used to address practices not
related to personal injury.
ÂNOTE
Information that requires special emphasis.
ÂTIP
Alternate techniques or clarifying information.
SHALL:
This word is understood to be mandatory.
SHOULD:
This word is understood to be advisory.

4 Sentry Equipment Corp
General Safety Precautions
Product Selection, Installation, and Use
Improper selection, installation, or use can cause personal injury or property damage. It is solely
the responsibility of users, through their own analysis and testing, to select products suitable
for their specific application requirements, ensure they are properly maintained, and limit their
use to their intended purpose.
Follow proper local, state, and federal regulations for proper installation and operational
requirements.
Always use caution and common sense when working with any chemical. Read the product
label and Material Safety Data Sheets (MSDS) carefully and follow the instructions exactly.
Potential Equipment Hazards
Hot surfaces! This equipment may have very hot surfaces. If an operator contacts a hot surface,
injury may occur. Use protective clothing to prevent injury. If other equipment comes in contact
with a hot surface, damage to the equipment may occur. Ensure the area around this equipment
is kept clear to prevent this damage from occurring.
High pressures! This equipment may contain fluids at very high pressures. Prior to installing,
removing, or maintaining this equipment, ensure that the equipment is isolated from all
connecting piping, the equipment is depressurized, the contents have been drained, and the
equipment is cool.

Sentry XC Boiler Blowdown System 5
Installation
The Sentry® XC Boiler Blowdown System can be mounted any place convenient to the cold
water make-up line, usually near the feed water heater or receiver. Locate the blowdown
system so that the internal expansion tube assembly can be withdrawn from the
handwheel end of the proportional control valve without breaking the make-up piping
and so that the tube bundle of the exchanger can be removed. Be sure the handwheel
and thermometer are conveniently placed. Install any separately packed piping manifolds,
pressure gauges and the thermometer according to the diagrams.
Make-up Piping. Break into the make-up line and install two (2) tees with a valve
between them. From these two (2) tees, install two (2) shut-o valves and then pipe the
water to the top connection on the handwheel end and from the bottom connection on
the other end back to the make-up line. The make-up connections can be bushed down,
but not smaller than the main make-up piping.
Blowdown Piping. Use extra heavy pipe one size larger than the blowdown system.
Connect to the continuous blowdown connection on boiler to the connection as indicated
on the diagrams. Connect the blowdown outlet connection to an open sewer connection
so that the blowdown may be observed. Do not place any valves in this line to the sewer.
Do not install any flow regulating valves in blowdown line between the boiler and blowdown
system. Installation of isolation valves is acceptable.
No Continuous Blowdown Connection on Boiler. Install an extra heavy coupling or
use any existing connection so that it is on the opposite side or as far away from the feed
water inlet as possible. The best elevation is 4" below the low water level. If in doubt ask
the boiler manufacturer about the best location.

6 Sentry Equipment Corp
XC for Single Boilers. Note that all of the make-up is diverted through the shell of the
blowdown unit. Be sure that the piping is large enough to handle the make-up water
required. Place the discharge blowdown connection to the sewer so that it is easy to
take a sample and easy to measure the rate of ow. This blowdown is cool. The unit is
controlled by adjusting the handwheel and observing the thermometer, so see that they
are conveniently placed.
Figure 1. Model No. X43-C through X89-CK

Sentry XC Boiler Blowdown System 7
XCM for Multiple Boilers. These XCM’s are the same as the XC Systems, except they are
provided with a ow control valve manifold and a sample cooler. Each XCM should be
associated with only one feed tank and its make-up line and all of the boilers connected to
that feed tank. All of the boilers must operate at approximately the same pressure. Consult
the factory for possible exceptions. From each boiler, connect a separate blowdown line to
each strainer and ow control valve. The blowdown must enter the side of the ow control
valve and discharge at the bottom. These ow control valves are intentionally installed
backward for longer service.
Figure 2. Model No. X43-CM through X89-CKM

8 Sentry Equipment Corp
Operation
Models X43-C to X89-CK for Single Boilers
The level of dissolved solids or specic conductance should be adjusted to prevent
foaming, priming, scaling, etc. Information can be obtained from your water treatment
rm(s) on the required level to maintain and the preferred testing method. If you do not
have the proper equipment to make these tests to determine the condition of your boiler
water, we suggest that you purchase a portable conductivity meter to determine how
much you should blow down. If your boiler tests too high, blowdown more. If it tests too
low, reduce the amount of blowdown.
To adjust the amount of blowdown, open or close the handwheel on the thermometer
end of the blowdown unit. Turning the handle slightly counter clockwise will increase
blowdown as the valve opens; turning the handwheel clockwise will reduce the amount of
blowdown. The thermometer in the control unit gives an indication as to the relative ows
of the make-up and blowdown. It will aid you in adjusting the handwheel. If you need
more blowdown, open the valve enough so the thermometer reads, say 5°F (3°C) higher in
steady operation and vice-versa.
The step-by-step instructions for starting the blowdown unit are:
1. Open the two (2) customer supplied make-up water isolation valves to allow the
make-up water to ow through the heat exchanger shell.
2. Close the customer supplied by-pass valve in the make-up water line to force all of the
make-up water through the shell.
3. Open or close the handwheel on the control valve to adjust the temperature of the
blowdown to approximately 27°F (15°C) above the make-up water for X4C units,
21°F (12°C) for X6C units, or 18°F (9°C) for X8C units. This temperature reading must
be made when the unit has reached steady state. Check the concentration of the
boiler water every few hours until a trend is noted upward or downward. If the trend
is towards too high a concentration, open the handwheel slightly, ⅛to ¼ of a turn.
You will note that the blowdown from the unit may ow heavily at times or not at
all at other times. This is normal as this is the way the make-up ow is occurring.
After several weeks of operation you will nd a control point to maintain your boiler
concentration and a simple daily check from then on should assure you of a properly
blown down boiler.
Models X43-CM to X89-CKM for Multiple Boilers
The XCM’s will be operated exactly as the XC’s above, but in addition require the balancing
of the ow control valves for the load being carried by each of the boilers.
Proceed with the start up of this unit exactly in the same manner as the single boiler units
above with the Tasco Flocontrol Valves set in the half open position. The Tasco Flocontrol
Valve openings must be set in accordance with the approximate load that each boiler is
taking. This balancing should be done, however, so that the average valve openings are
always one-half. If there are two valves and one is set at a ¼ opening, the other should

Sentry XC Boiler Blowdown System 9
be set at ¾ opening. If there are three valves and one is set ½ open and another ¾ open,
the third one should be about ¼ open. After several days of operation you should be able
to balance the boilers so that they all reach approximately the same test. Under known
conditions, however, you will want to anticipate variations. For example, if a boiler is to
be shut down for several days or months because it is not required, you can turn o the
ow control valve from that boiler. Remember the automatic control should be adjusted
to hold the average settings of the boilers in question and the hand ow control valve
should balance according to the loads that the various boilers carry.
ÂNOTE
XCM System will maintain consistent solids control for a boiler system having a make-up valve
that closes and opens slowly as the water level rises and falls. A snap action valve should be
avoided if possible – to avoid the possibility of having to frequently readjust the proportional
control valve.
Avoid vibration, erosion and corrosion which are the typical causes of type XC System failures
Avoid Flash Steam In The Blowdown Water
Flash steam destroys the heat exchangers, valves and piping. Even a small amount of ash
steam in the blowdown lines between the boiler and the XC will result in excessive water-
steam velocities. For example, an 11 psig ( 0.7 bar-g) pressure loss in water at 138 psig
(9.5 bar-g) and 360°F (182°C) will generate only 0.73% of ash steam. However, this small
amount of steam will increase the velocity in the blowdown lines by 230%.
Excessive velocity destroys heat exchanger, valves and piping by causing:
a. Erosion failure
b. Vibration which fatigues and ultimately fractures exchanger bundles.
c. Vibration which results in stress corrosion cracking of the exchanger bundles
Prevent ash steam in the blowdown line between boiler and XC System by:
a. Using only wide-open gate or plug isolation valves between the boilers and the XC.
b. Using extra heavy blowdown piping one size larger than the XC inlet connection.
c. Set the ow control valves (for the multiple boiler XCM System) so that the average
valve opening is always at one-half (see page two of SD 1730). Flow control valves
set in this manner will not generate ash steam.
d. Do not insulate the blowdown piping. A small amount of blowdown cooling is
necessary to compensate for the line friction loss.

10 Sentry Equipment Corp
Avoid Excessive Tubeside and Shellside Water Velocities
To prevent damaging vibration and erosion, do not exceed the ow rates listed below.
Model Max. Blowdown Flow Rate Max. Make-up Water Flow
Rate
X43 2 gpm (7.6 lpm) 48 gpm (182 lpm)
X46 4 gpm (15.1 lpm) 48 gpm (182 lpm)
X66 9 gpm (34.1 lpm) 130 gpm (492 lpm)
X69 14 gpm (53.0 lpm) 130 gpm (492 lpm)
X89 22 gpm (83.3 lpm) 180 gpm (681 lpm)
Do Not Allow Make-up Water to Be Heated Above 140°F to avoid:
a. severe shellside scaling of the XC Heat Exchanger
b. liberated dissolved gases which corrode and erode the exchanger, valves, piping
and deaerator inlet.
Maintain and adjust the proportional control valve so it will properly proportion makeup
to blowdown – to stop overheating of makeup. Replace damaged rubber diaphragms
(of the proportional control valve) because undamaged diaphragms are essential for the
proper operation of the proportional control valves.
Avoid Contaminating the Make-up with Chloride Ions from Water Treatment
Systems
This can cause stress corrosion of stainless steel tubes in the XC Heat Exchanger.
Water treatment systems (Zeolite softeners and demineralizers) are regenerated with
sodium chloride and hydrochloric acid. If not adequately back-washed before returning
to service, these systems will heavily contaminate the make-up water with chloride
ions. Chloride ions, together with the low pH water from the treatment systems may
cause stress corrosion of the stainless steel tubing of the XC heat exchanger, resulting in
premature failure.
The water treatment system operator should measure the output water (using
conductivity meters, cells, etc.) to verify that a regenerated system is adequately back-
washed before returning the water treatment system to service.

Sentry XC Boiler Blowdown System 11
Maintenance
Properly maintain and adjust the proportional control valve so it will proportion makeup to
blowdown – to stop overheating of make-up. Overheated make-up results in (a) severe shell-
side scaling of the heat exchanger and proportional control valve and (b) liberated dissolved
gasses that corrode and erode the exchanger, valves, piping and deaerator inlet.
A proper preventative maintenance program includes yearly overhauling and cleaning
of the exchanger and proportional control valve. Failure to do so can result in scaling
equipment beyond salvaging. Replacement of the diaphragm every two years or sooner
as needed is recommended.
Disassembly and Reassembly
Close blowdown and makeup water valves before disassembly.
Proportional Control Valve
Remove handwheel block bolts.
Remove block assembly by separating it at the diaphragm.
Remove valve plunger.
Loosen diaphragm from the shell ange.
Unscrew the valve seat from the expansion tube.
Remove diaphragm.
Break unions in blowdown inlet line and move piping out of the way.
Unscrew pipe nut.
Protect the threaded end (blowdown inlet) of the expansion tube with a wooden
block.
Loosen tube with light hammer blows.
Remove tube toward the handwheel end of the the valve.
After overhaul, reassemble in opposite manner.
Properly align gaskets and diaphragm during reassembly.
Except for replacement of the diaphragm, the above procedure is not routine
maintenance.

12 Sentry Equipment Corp
Heat Exchanger
Shellside scaling is typically the cause of any required maintenance. Descaling may be
chemical and in-place by circulating inhibited acid through the shellside. Operator should
contact a water treating chemical supplier for appropriate descaling procedures, agents
and apparatus.
1. Disassemble the exchanger
a. Disconnect blowdown piping.
b. Remove head bolts, head, pass divider and their gaskets.
c. Back o the bundle antivibration hold down bolts on the shell. Pull out the tube
bundle. Use a straight pull when removing the bundle – to avoid damaging the
longitudinal pass dividers.
2. If the shellside is severely scaled:
a. Loosen the bundle free by prying with
several bars inserted between tube sheet
and shell ange.
b. Use a block and tackle to pull bundle.
c. Pre-soak the shellside with inhibited
acid.
3. Reassemble in opposite fashion.
a. As the tube bundle is reinserted,
position the seals (of the
longitudinal pass divider) in the
upward direction (toward shellside
inlet) per diagram.
b. Typically, new gaskets are required for
reassembly.
c. Torque bolts hand tight in star fashion.
d. Insure alignment of head, pass divider and
shell ange and all gaskets.
e. Tighten again in star fashion.
f. Tighten head bolts rst, then tighten bundle hold-down bolts ¼ turn past snug
Overhaul And Repair/General Cleaning
Normal cleaning includes removal of scale and rust from the proportional control valves
and the exchangers. The tubesides (blowdown water side) typically do not collect scale
or foreign matter. A fouled tubeside may be cleaned chemically (inhibited acid) or
mechanically with manual or rotary bristle brushes (take care not to damage U bends),
and with water ushing.

Sentry XC Boiler Blowdown System 13
Shellside fouling may be removed chemically (inhibitied acid) or mechanically (scraping,
wire brushing, light sandblasting, etc.).
Do Not Descale With Muriatic Acid (Hydrochloric Acid)
This can cause stress corrosion of stainless shell tubes in the XC heat exchanger. Use
an inhibited sulfamic acid boiler descalant (or similar product) in accordance with the
manufacturer’s recommended procedures.
Proportional Control Valves
Replace worn or damaged rubber diaphragms (Undamaged diaphragms are essential
for proper operation of proportional control valves).
Reseat the valve as necessary by lapping with a coarse valve grinding compound and a
clockwise – counterclockwise rotary motion.
Replace worn or damaged ange gaskets.
Heat Exchangers
Make visual examination for suspected leaks in an assembled exchanger as follows:
1. Install a temporary ring ange in place of the head – so that tube ends are exposed
2. Pressurizing the shellside (max. 250 psig [17.3 bar] water or max. 50 psi [3.5 bar] air). If
pressurizing with air, use a bubble leak detector solution to detect leaks.
3. Repair minor leaks by one or more of the following actions:
a. Rerolling leaking tube-to-tubesheet joints.
b. Welding holes in tubes and U bends with stainless steel ller rod.
Extensive damage may require returning the exchanger to the factory for repair
Other Valves – V-Port Flow Control, etc.
Contact valve manufacturer for instructions regarding cleaning, reseating and repair parts.
ÂNOTE
Flow control valves are intentionally installed backwards. This arrangement provides greater
valve life and does not affect performance.

14 Sentry Equipment Corp
Parts List
Common Parts for C, CL CK, and CB Controls
Item No. Description Part No.
1 Handwheel Jam nut 4-00404A
2 Handwheel 4-00403A
3Stem 2-00356A
4 Packing Nut 2-00353A
5 Packing Gland 2-00354A
6* Gasket, Front 2-00367A
7 Bonnet 2-00355A
9Bushing – Thermometer 2-00357A
10 Thermometer 4-01097A
23 Packing: 1/8" Square Teon Impregnated 1-00217B
Specific Parts for C, CL, CK and CB Controls
Item No. Model Description Part No.
8
C, CL
CK
CB
Control Block Body
2-00407A
2-00409A
2-00408A
11 C, CL, CK
CB Valve Plunger 2-00380A 2-00381A
13* C, CL, CK
CB Diaphragm 2-00351A 2-00352A
15
27
C, CL
CK, CB
Bolts, standard hardware; purchase locally 4-01011V
4-01011M
16 C, CL, CK
CB Valve Seat 2-00375A 2-00376A
17 Any Expansion Tube Assembly (Provide model
and serial number from nameplate)
19 Any Shell Assembly (Provide model and serial
number from nameplate)
24* C, CL
CK
CB
Gasket, Rear 2-00612A
2-00364A
2-00657A
25
C, CL
CK
CB
Flange Plate
2-00410A
2-00419A
2-00412A
26 C, CL
CK
CB
Tube Lock Nut 4-01270A
2-00384A
2-00383A
* Recommended Spare Part

Sentry XC Boiler Blowdown System 15
Figure 3. C, CL, CK and CB Controls

16 Sentry Equipment Corp
Heat Exchanger Parts
Model Numbers X43
X46
X66
X69 X89
Diameter 4" 6" 8"
Item No. Description Part No. Part No. Part No.
1 Head 2-00294A 2-00295A 2-00297A
2* Head Gasket 2-00277B 2-00278B 2-00280B
3 Pass Divider for Tube Side 2-00299A 2-00300A 2-00302A
4* Tube Sheet Gasket 2-00286B 2-00287B 2-00288B
13* Flange Gasket 2-00282B 2-00283B 2-00284B
17 Packing Gland 2-00274A 2-00274A 2-00274A
18 Jam Nut 4-01062A 4-01062A 4-01062A
19 Hold down/anchor bolt 4-01067C 4-01067C 4-01067C
20 Bolting SA193B7 or SA194 Gr. 7 type hardware or equivalent must be used.
Purchase locally.
* Recommended Spare Part
Heat Exchanger
Model No.
Item 5: Tube
Bundle Part No.
Item 16: Shell
Part No.
X43 6-00093A 6-00084A
X46 6-00094A 6-00085A
X66 6-00095A 6-00086A
X69 6-00096A 6-00087A
X89 6-00099A 6-00650A

Sentry XC Boiler Blowdown System 17
Figure 4. Type X Heat Exchanger

18 Sentry Equipment Corp
Figure 5.
Model Max # of
boilers
Dimensions - Tolerance is ± ½" except as noted Connections - FPT
A B C D E F J 1 2 3 4 6
X43-CM 3 53" 18.38" 18.5" 28" 7" 4" 9.31" 1½ 1½ ¾ ¾ ¼
134.6cm 46.7cm 47cm 71.1cm 17.8cm 10.2cm 23.7cm
X46-CM 4 80" 18.38" 18.5" 64" 7" 4" 23.31" 1½ 1½ ¾ ¾ ¼
203.2cm 46.7cm 47cm 162.6cm 17.8cm 10.2cm 59.2cm
X66-CLM 5 82.5" 20.38" 18.5" 64" 9.12" 4" 23.5" 2 2 ¾ ¾ ¼
209.5cm 51.8cm 47cm 162.6cm 23.2cm 10.2cm 59.7cm
X69-CLM 5 125.5" 20.38" 18.5" 100" 9.12" 4" 33.5" 2 2 ¾ ¾ ¼
318.8cm 51.8cm 47cm 254cm 23.2cm 10.2cm 85.1cm
X89-CKM 6 126" 24.38" 18.5" 100" 11.12" 4" 32.31" 3 3¾1¼
320cm 61.9cm 47cm 254cm 28.2cm 10.2cm 82.1cm
= Sample Outlet
= Cooler Outlet
6 5
4
Vent
5
1
64
3
Bundle
Clearance 3
# of Boilers (optional)
3 3 3 Thermometer
(Shipped Loose)
1
6
D
Ref.
C
Ref.
A
REF.
3
B
Ref.
E
REF.
= Make-Up Inlet = Make-Up Outlet
2 1
(4) Ø 3/4"
Mtg Holes
2
F
REF.
Drain
J
Ref.
= Blowdown Outlet = Blowdown Inlet
4 3
Safety Relief Conn.
2

Sentry XC Boiler Blowdown System 19
Standard Warranty
Sentry Equipment Corp (“Seller”) warrants products manufactured by it and supplied
hereunder (“Products”) to be free from defects in workmanship and, to the extent
materials are selected by Seller, to be free from defects in materials, in each case for a
period as dened in the table below:
Brand Product Line Warranty Period
Sentry® Steam & Water Sampling Products and Systems
Solid & Powder Sampling Products and Systems
Gas Sampling Products and Systems
Liquid & Slurry Sampling Products and Systems
Pipeline Integrity Products
Eighteen months from
date of shipment or
twelve months from
startup (whichever
occurs rst)
Waters
Equipment
Steam & Water Sampling Products and Systems Twelve months from
date of shipment
To view the full warranty, go to
www.sentry-equip.com/warranty.
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, and repeatable
process monitoring and measuring. By eectively conditioning, 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.

Installation Service—For systems that require specialized expertise upon installation.

Technical Support—Troubleshooting, training, and technical manuals.

Field Service & Retrots—When a problem needs immediate attention.
Replacements Parts & Consumables—Order your replacement parts and consumables.

Sentry ProShield Services—Select from four ProShield Guardian service plans
providing dierent levels of support to protect your large system investments with
regularly scheduled maintenance.
To learn more, go to
www.sentry-equip.com/support.

sentry-equip.com
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in more than 50 countries
across six continents worldwide.