SH-900, SH-1500 SH-1600 Bimetallic Steam Trap

SH-900, SH-1500 SH-1600 Bimetallic Steam Trap
SH-900, SH-1500 & SH-1600
Bimetallic Steam Trap
Installation and Operation Manual
SH-1500
SH-900
SH-1600
111-EN
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Contents
General Safety Information....................................................................3
Product Information.............................................................................3
Product Installation..............................................................................4
Maintenance Requirements....................................................................5
Troubleshooting............................................................................... 5-6
Repair Procedure................................................................................6
Repair Parts......................................................................................6
Limited Warranty and Remedy................................................................7
2
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
General Safety Information
This bulletin should be used by qualified personnel as a guide to the installation of Armstrong SH-900, SH-1500 and SH-1600
Bimetallic Steam Traps. Selection or installation of equipment should always be accompanied by competent technical assistance.
You are encouraged to contact Armstrong International, Inc. or its local sales representative for additional information.
Caution: When working with high pressure/temperature steam, follow safe practices
Product Information
Operation
Bimetallic type steam traps employ the temperature effect of a thermostatic bimetallic element. At start up, the steam traps have
the ability to handle large condensate loads while the system is heating up. At this point the bimetallic element is contracted
and the valve is fully open removing condensate and non-condensable gases from the system. When the system reaches steam
temperature, the high temperature causes the bimetallic element to expand, pulling the valve stem to close the valve. The valve
remains closed until enough condensate backs up cooling the bimetallic element. As the bimetallic element cools, the valve
slightly opens to pass condensate and vent non-condensable gases. When steam temperature is achieved, the valve closes again.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
3
Product Installation
Before installation, verify that the maximum allowable pressure/temperature and maximum operating pressure of the trap are
sufficient to handle the system design pressure and temperature. This information can be found on the label located on the trap.
Steam trap installation is critical from both a performance and maintenance aspect. Installation of the trap is simplified if you
follow these guidelines.
1. Before installing the trap, ensure the line is clean. Blow down any strainers ahead of the trap.
2. Install the trap so that it is accessible for inspection and repair, below the drip point and close to the vertical drip leg.
3. For proper operation the trap should be installed in the horizontal line with the domed cap in the up position.
4. What little condensate there is on superheat and high pressure/low load service usually forms in drip legs and in the
trap themselves. Therefore, proper piping and drip legs of adequate size and diameter are essential for the successful
operation of the Armstrong bimetallic traps, see Chart 3.1 and Figure 3.1.
5. Isolation valves are needed before and after traps. When starting a new trap, be sure to open the valve slowly.
6. Due to the high temperatures of steam, it might be necessary to guard the traps for personnel safety.
7. See Figures 4.1 and 4.2 for complete installation following the above guidelines.
H
Drip Length
Minimum (in)
M
D
Steam Main
Size (in)
Drip Leg
Diameter (in)
Supervised
Warm-Up
Automatic
Warm-Up
1/2
3/4
1
2
3
4
6
8
10
12
14
16
18
20
24
1/2
3/4
1
2
3
4
4
4
6
6
8
8
10
10
12
10
10
10
10
10
10
10
12
15
18
21
24
27
30
36
28
28
28
28
28
28
28
28
28
28
28
28
29
30
36
Steam Main
Incorrectly
Sized
Drip Leg
Correctly
Sized
Figure 3.1
Chart 3.1
Steam Main
Steam Main
M
M
D
H
Drip leg same as
the header
diameter up to
4''. Above 4'', 1/2
header size, but
never less than 4''.
Drip Leg
Drain
Valve
Figure 4.1
4
H
D
Strainer
Figure 4.2
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
Disassemble/Assemble Procedure for Welding SH-1500 & SH-1600 – If post weld heat treat is required by customers’
weld procedure.
1. Remove 4 flange bolts and cap.
2. Remove bimetallic element assembly using a 1” open end wrench on hex below the bimetallic elements.
3. Preheat, weld and post weld heat treat per customers weld procedure.
4. Clean gasket surfaces and replace gasket with a new one.
5. Replace bimetallic element assembly using the 1” open end wrench. Torque to 100 – 125 ft-lbs., [136 to 170 Nm].
6. Replace cap and flange bolts
7. Torque the flange bolts with a 3 or 4 step crisscross pattern to 280 ft-lbs., [380 Nm] for the SH-1500 & SH-1600
and to 90 ft-lbs., [122 Nm] for the SH-900.
Maintenance Requirements
High pressure drips traps should be tested at least three times per year. When the bimetallic steam trap is suspected of
malfunctioning, it can be checked by observing the discharge of the trap. Normal trap operation would be indicated by:
Trap discharging condensate continuously (modulating)
Trap discharge in cycles (on-off)
All discharges are accompanied by large amounts of flash steam.
Do not confuse the discharge of flash steam with live steam loss. If the trap continues to blow live steam, isolate the trap
and repair or replace. See disassembly/assembly procedure in Product Installation section for repair.
Troubleshooting
Whenever a trap fails to operate and the reason is not readily apparent, the discharge from the trap should be observed.
If the trap is installed with a test outlet or discharges to atmosphere, this will be a simple matter - otherwise, it will be
necessary to break the discharge connection.
1. Cold Trap - No Discharge
No condensate or steam coming to trap.
a) Stopped or plugged strainer ahead of trap
b) Broken valve in line to trap
c) Pipeline or elbows plugged
d) Pressure reducing valve out of order
e) Isolation valves are off/closed
Caution: Superheated steam is invisible. Do not place objects directly in the path of trap discharge. In a blow
through situation a loud roar should be heard even though there may not be visible steam.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
5
2. Steam Loss
If the trap leaks or blows live steam, trouble may be due to any of the following causes:
a) Valve may fail to seat
b) Piece of scale lodged in orifice
c) Worn parts
Perceived Troubles: If it appears that steam escapes every time trap discharges, remember: Hot condensate forms
flash steam when released to lower pressure, but usually condenses quickly in the return line.
3. Continuous Flow
A. Trap not up to temperature. Allow more time for condensate removal (on start-up).
B. On large loads the traps is working fine as designed.
If the trap is found defective, repair in line.
Repair Procedure
• Isolate the trap
• Blowdown/bleed off the internal pressure
• Unbolt and remove the cap
• Place 1” open end wrench on the hex below the elements and unscrew the assembly
• Remove the old gasket from the body and cap seating surface
• Clean or replace the screen
• Install a new gasket on the body seating surface
• Install screen
• Replace the element assembly using a 1” open end wrench on the hex surface. Torque to 100 – 125 ft-lbs., [136 to 170 Nm].
• Reassemble the cap into the body seating surface recess
• Reassemble bolts and nuts
• Torque the flange bolts with a 3 or 4 step crisscross pattern to 280 ft-lbs., [380 Nm] for the SH-1500 & SH-1600 and to 90
ft-lbs., [122 Nm] for the SH-900.
When starting a trap, be sure to open the isolation valves slowly and check for gasket leaks.
Caution: Superheat steam is invisible. Take extra precaution while inspecting traps.
Repair Parts
CAP
Available
Repair Parts:
• Cap
ELEMENT
• Body
GASKET
BOLT SET
SCREEN
• Element
• Screen
• Gasket
• Bolt Set
OUTLET
INLET
BODY
Figure 5.1 Repair parts for SH-900/SH-1500/SH-1600
6
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
Limited Warranty and Remedy
Armstrong International, Inc. or the Armstrong division that sold the product (“Armstrong”) warrants to the original
user of those products supplied by it and used in the service and in the manner for which they are intended, that
such products shall be free from defects in material and workmanship for a period of one (1) year from the date of
installation, but not longer than 15 months from the date of shipment from the factory, [unless a Special Warranty
Period applies, as listed below]. This warranty does not extend to any product that has been subject to misuse,
neglect or alteration after shipment from the Armstrong factory. Except as may be expressly provided in a written
agreement between Armstrong and the user, which is signed by both parties, Armstrong DOES NOT MAKE ANY OTHER
REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
The sole and exclusive remedy with respect to the above limited warranty or with respect to any other claim relating
to the products or to defects or any condition or use of the products supplied by Armstrong, however caused, and
whether such claim is based upon warranty, contract, negligence, strict liability, or any other basis or theory, is limited
to Armstrong’s repair or replacement of the part or product, excluding any labor or any other cost to remove or install
said part or product, or at Armstrong’s option, to repayment of the purchase price. As a condition of enforcing any
rights or remedies relating to Armstrong products, notice of any warranty or other claim relating to the products must
be given in writing to Armstrong: (i) within 30 days of last day of the applicable warranty period, or (ii) within 30 days of
the date of the manifestation of the condition or occurrence giving rise to the claim, whichever is earlier. IN NO EVENT
SHALL ARMSTRONG BE LIABLE FOR SPECIAL, DIRECT, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES,
INCLUDING, BUT NOT LIMITED TO, LOSS OF USE OR PROFITS OR INTERRUPTION OF BUSINESS. The Limited
Warranty and Remedy terms herein apply notwithstanding any contrary terms in any purchase order or form submitted
or issued by any user, purchaser, or third party and all such contrary terms shall be deemed rejected by Armstrong.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
7
SH-900, SH-1500 & SH-1600
Bimetallic Steam Trap
Installation and Operation Manual
Designs, materials, weights and performance ratings are approximate and subject to change without notice.
Visit armstronginternational.com for up-to-date information.
Armstrong International
North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
armstronginternational.com
111-EN
Printed in U.S.A. - 12/18/15
© 2015 Armstrong International, Inc.
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