Emerson Spence N650 Series User manual

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Spence N650 Series Thermostatic Steam Traps
▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.
N650 Series steam trap must be
installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations and
Emerson instructions.
If leak develops in the system, service
to the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a
qualified person shall install or service
the N650 Series steam trap.
Introduction
Scope of the Manual
This manual provides instructions for installation,
maintenance and parts information for the N650 Series
Thermostatic Steam Traps.
Product Description
A steam trap is an automatic valve which discharges
condensate, undesirable air and non-condensibles
from a system while trapping, or holding in, steam.
Thermostatic steam traps operate in direct response to
the temperature within the trap.
N650 Series is a balanced pressure design
with stainless steel welded actuator capable of
discharging condensate within 10°F / -12°C of
saturated temperature.
For greater sensitivity or protection from ash steam
locking, SLR orice is available to allow condensate
and ash steam evacuation at or near saturated
temperatures. If subcooling of condensate is desired,
alternate thermostatic actuator is available to allow
condensate evacuation at or near 40°F / 4.4°C below
saturated temperatures.
Thermostatic actuator has a conical valve lapped in
matched sets with the seat ring assuring tight shut o󰀨.
A minimum of four orice sizes is available allowing
for custom capacity sizing. Trap is forged carbon steel
Y pattern body with strainer and blow down valve
suitable for pressures up to 650 psig / 44.8 bar and
available in NPS 1/2 and 3/4 / DN 15 to 20 in NPT or
socket weld end connection.
Figure 1. N650 Series Thermostatic Steam Trap
Instruction Manual
VCIMD-16893
November 2021
N650 Series

Principle of Operation
Thermal actuator is filled at its free length with a
liquid having a lower boiling point than water. As
assembled, valve is normally open. When very hot
condensate enters trap, thermal actuator fill vaporizes
to a pressure higher than line pressure. This forces
valve into seat orifice to prevent any further flow. As
condensate collects, it takes heat from the actuator,
lowering internal pressure. Line pressure will then
compress thermal actuator to open valve and
discharge condensate. Valve opening automatically
adjusts to load conditions from minimum on very light
loads to full lift at maximum load. Optional blowdown
valve allows fast and easy cleaning of internal strainer
without removing trap from operation.
Installation
▲ WARNING
Personal injury or system damage may
result if this steam trap is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in the
Specifications section and/or steam
trap nameplate.
Additionally, physical damage to the
steam trap may result in personal injury
or property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the steam trap in a
safe location.
Specications
This section lists the specications for the N650 Series. Factory specications are stamped on the nameplate
fastened on the steam trap at the factory.
Cover Gasket: Stainless Steel Spiral Wound with
Graphite Fill
Strainer and Blowdon Valve: Stainless Steel
Valve and Seat: Hardened 416 Stainless Steel
Applications
Unit Heaters
Air Vents
Steam Tracing
Drip Legs
Platen Presses
Plating Tanks
Sterilizers
Tire Presses
Cooking Equipment
Laundry Equipment
Other Process Equipment
Options
B: Blowdown Valve
ISO: ISO Filled Actuator(3)
SK: Skirted Seat(3)
SLR: SLR Orifice
SW: Socket weld
Approximate Weight
5 lbs / 2.3 kg
Available Conguration
Type N651-FO: Y pattern body withstrainer and
blowdown port tapped and plugged; low capacity,
fail open
Type N652(1):Reduced capacity
Type N653(1):Standard capacity
Type N654(1):High capacity
Body Size
NPS 1/2 and 3/4 / DN 15 and 20
End Connection
NPT and Socket Weld
Maximum Operating Pressure(2)
Standard Traps: 500 psig / 34.5 bar g
ISO Option Traps: 650 psig / 44.8 bar g
Maximum Allowable Pressure(2)
650 psig / 44.8 bar g
Maximum Operating Temperature(2)
Standard Traps: 600°F / 316°C
ISO Option Traps: 650°F / 343°C
Maximum Allowable Temperature(2)
750°F / 399°C
Materials of Construction
Body and Cover: Forged steel
Actuator: Welded Stainless Steel
1. Add (-FC) for fail closed or (-FO) for fail open to end of type number.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
3. Emerson Process Management Regulator Technologies, Inc. (Emerson) recommends ISO lled Actuator above 500 psi / 34.5 bar and for superheated steam. Emerson recommends
skirted seat above 300 psi / 20.7 bar.
2
N650 Series

All pressure equipment should be
installed in a non-seismic area;
should not be exposed to fire; and
should be protected from thunderbolt
(lightning) strikes.
1. Before installing trap, blow steam through
equipment and piping to remove scale, pipe
threading chips and other dirt.
2. Ensure that the trap is suitable for maximum
steam pressure to which it will be subjected.
Note
Emerson Thermostatic Steam Traps
do not require change of parts for
different pressures.
3. Check arrows on trap body or cover to ensure that
flow direction is correct.
4. Locate trap accessibly and if possible, below drain
outlet for rapid testing and cleaning.
5. Use a separate trap for each unit, coil, surface,
chest, etc.
6. Provide uninsulated condensate reservoir and
cooling leg between outlet of equipment and trap
inlet. See Figure 2.
7. Include unions in inlet and outlet piping if trap will
be removed from installed location for cleaning
and maintenance.
8. Install an Emerson strainer, a dirt pocket or both,
close to trap inlet. See Figures 3, 4 and 5.
9. Include gate valves in inlet and outlet piping so
that other plant operations can continue while
trap is being cleaned, serviced or maintaned. See
Figure 7.
10. Install a check valve close to the trap outlet,
if discharging to a common return main, and
whenever condensate must be lifted after passing
through the trap. See Figure 6.
11. Provide an Emerson STV three-way test valve that
discharges into return mains in piping close to trap
outlet for quick testing. See Figure 7.
12. Provide a water seal at the bottom of the riser
if trap is located above an equipment drain and
whenever condensate is lifted to the trap. See
Figure 8.
13. For piping conditions in step 12, for siphon-
drained equipment and for tilting jacketed kettle,
specify Emerson traps with “steam lock release
valves” (SLR).
14. Ensure that freeze-proof traps are installed on
outdoor applications. Spence Types A, C, CS
and N125 traps are freeze-proof. Types N450,
UMT450, N650, AHV and TA traps are freeze-
proof when piped vertically with outlet down (see
step 22).
15. Provide condensate-collecting pockets for
traps draining steam mains, headers, risers
and branches.
16. Ensure that return main is large enough to handle
the condensate from all traps discharging into it,
without causing excessive back pressure.
17. Always discharge high and low pressure traps into
separate return mains.
18. Do not insulate the trap or the piping and fittings
between equipment outlet and trap inlet unless
absolutely essential.
19. Do not use piping, nipples and fittings smaller than
trap connection size.
20. If possible, do not install trap with a long
horizontal run of piping between equipment outlet
and trap inlet. If such a hook-up is necessary,
specify Emerson Traps with “steam lock release
valves” (SLR).
21. Do not include a by-pass around trap unless
equipment drained must be kept in operation while
trap is being cleaned or serviced.
22. Do not jeopardize the advantage of a freeze-
proof trap by lifting the condensate or by the use
of horizontal piping from the trap outlet without
considerable pitch in the direction of flow or by
piping the trap in any way which will prevent fast
gravity drainage when steam is turned off.
3
N650 Series

Figure 4. Types AHV, N450, N650, TA and UMT450 Industrial
Steam Traps can be mounted either horizontally or vertically.
They are freeze-proof when mounted vertically.
Figure 5. Dirt pocket made from pipe ttings when a strainer is
not available. Clean dirt pockets and strainers frequently.
Recommended Piping Layouts
Figure 2. Ample UNINSULATED cooling leg and
strainer. If 18 in. / 457 mm vertical cooling leg
is not available, make up the difference with
horizontal piping.
Figure 3. N650 Series Industrial Traps have either vertical or
horizontal outlets. Pipe plug is for draining if there is danger of
freeze-up.
4
N650 Series

Figure 6. Check valve installed at the discharge of trap when
condensate must be lifted or when return line backpressure
exists. Condensate can be lifted 2 ft / 0.61 m for each PSI
pressure at trap.
Figure 7. To determine if trap is working properly, turn STV
handwheel to test position. This directs trap discharge to
ground. Check for continuous ow of condensate, slight or no
ow and live steam. Do not mistake normal ash steam with
hot condensate for live steam. After testing, be sure STV is
positioned to allow condensate discharge to the condensate
return system.
Figure 8. Recommended piping diagram for applications where
condensate must be lifted to the trap.
Operation and Testing
1. When steam is first turned on, the large, wide-
open orifice of an Emerson trap will quickly
discharge all “warm-up” condensate and air
from equipment drained. After this initial load
has been expelled, live steam will follow and
its heat generates a balancing pressure inside
bellows, the bellows will immediately expand,
closing the valve. Thereafter, trap operation will
be intermittent, without live steam discharge,
the frequency and duration of the cycles
depending on the steam pressure, the amount
of condensate and air coming to the trap and the
condensate temperature.
2. Periodically test the operation of all traps, which
are piped so that the discharge will not be
observed. Use a three-way test valve for visual
discharge. If test valves have not been installed,
check temperatures of inlet and outlet piping close
to the trap. Use a surface pyrometer or an infrared
temperature device to detect temperature.
a. If inlet piping is hotter than outlet piping,
with temperature of latter rising and falling
in sequence with trap discharge, trap
is satisfactory.
b. If inlet piping is considerably cooler than
known temperature of the steam supplied
to equipment drained, trap is either not
discharging or is too small for the application.
c. A stethoscope or ultrasonic device can be
utilized for testing intermittent discharge types
of traps, but some experience is necessary to
distinguish proper trap operation.
3. The recommended frequency of trap testing
depends on the importance of each application
and the operating conditions. There is no hard
and fast rule, but in general, traps on critical
applications should be tested daily to weekly;
weekly to monthly for less important equipment.
4. Be aware with the difference between the
unavoidable flash vapor in trap discharge and a
live steam leak. Flash steam is white and wet, and
most evident while the trap is discharging. Live
steam has a bluish tint, is dry and hot, and may
blow continuously.
5
N650 Series

Maintenance
△ CAUTION
Never open a steam shut off
valve rapidly. Condensate always
collects at the upstream side of
a closed, untrapped steam valve.
Waterhammer, destructive to
equipment, piping and traps, can
be initiated by quick opening of
such valves.
1. Test traps periodically. Adopt a reasonable
"Preventive Maintenance" program to schedule all
traps for internal inspection and cleaning at least
once a year.
2. Do not remove cover while the trap is very hot.
Wait until steam pressure has dropped and trap
can be comfortably touched with bare hand.
3. Do not drop traps or spare bellows or toss
them about.
4. Do not use a Stillson or Monkey wrench to remove
or replace bellows or tighten them excessively in
trap cover.
5. Do not store, pile or carry bellows with tools and
pipe fittings.
6. Most trap operating difficulties and failures are
caused by circumstances which the trap cannot
control. Some examples are pipe scale, dirt,
waterhammer, corrosive condensate, improper
installation and inaccessible location. Avoid or
correct these detrimental conditions.
7. Ensure to regularly blow down and clean strainers
and dirt pockets.
Repair
1. Wait until trap is cool to the touch.
2. Remove cover - remove and discard old gasket.
3. Remove bellows from cover. Use box or open
end wrench if bellows has hexagonal end fitting.
If bellows has round valve attached (Type N125,
N450 or UMT450), use vise-grip clamping on
valve diameter. Do not use pipe wrench on
bellows convolutions.
4. Remove valve from bellows if construction allows
(Type N125, N450 or UMT450).
5. Remove valve seat from body.
6. Examine bellows by:
a. Comparison to new bellows.
b. Immersing in cold and hot water to test
bellows travel.
c. If bellows are not damaged, reassemble into
cover; if damaged, replace. Leave threads of
bellows dry, tighten into trap cover snugly, and
do not over torque.
7. Examine valve and valve seat
a. Clean with 80 to 150 grit emory. If no wear or
wire drawing is present, the valve and seat
can be reused; if damaged, replace. Use
small amount of anti-seize compound on seat
and valve threads. Valve and seat should be
torqued for snug fit.
8. Insert new gasket.
9. Reassemble cover using small amount of anti-
seize compound on cover threads if trap has
screwed cover. If cover is bolted, use anti-seize
compound on the bolts.
10. Seating of cover gasket may be checked by
installing a pipe plug in outlet of trap and applying
80 psig / 5.52 barg air to inlet. Use soapy water
or leak detection fluid. A slight seepage should
be acceptable since air can pass through a small
opening that steam will not.
11. If possible, test trap before returning it to service.
Any pressure within trap range can be used; a
simple drip leg will suffice. Valve in trap should
close on steam. Leave trap on line long enough for
trap to cycle once.
6
N650 Series

WHEN THIS HAPPENS HERE IS WHERE THE TROUBLE MAY BE AND HERE IS WHAT TO DO
Trap not discharging -
cool to touch
1. Condensate not reaching the trap:
a. Pipe and fittings between equipment and trap plugged by dirt.
b. Strainer clogged by dirt.
a. Remove the obstruction.
b. Blow out or clean strainer.
2. Condensate not passing through trap.
a. Trap discharge orifice blocked by dirt.
b. Pipe and/or fittings between trap and return man plugged by
dirt.
a. Clan trap and install strainer.
b. Remove obstruction.
3. Valve, upstream or downstream, not open or failed in
closed position. Open or repair valve.
4. Bellows has developed a leak or crack. Replace the bellows. Check for corrosive condition and, if
present, substitute bellows material.
Trap discharging
condensate continuously -
warm to touch
1. Trap, strainer or piping partially obstructed by dirt. Remove the obstruction, blow down strainer and clean trap.
2. Valve, upstream or downstream, not open wide. Open valve wide.
3. Trap too small for condensate load. Add another trap in parallel or replace with larger trap
4. Condensate load has increased since trap was installed.
a. Boiler priming or foaming.
b. Leak in submerged coil of equipment.
c. Other traps have failed transferring condensate to
overloaded trap.
a. Correct the boiler condition.
b. Repair leak or replace coil/tube.
c. Locate and repair/replace faulty traps.
Trap discharging live steam
1. Trap valve not closing tight
a. Scale or dirt between valve and seat.
b. Valve or seat, or both, eroded and worn.
a . Clean trap and install strainer.
b . Replace valve and seat with a matched set.
2. Trap has been dropped - bellows misaligned so valve
cannot seat. Replace bellows and inspect trap for other damage.
3. Mistaking open or leaking by-pass valve for trap leak. Remove the by-pass if permissable, otherwise close or
repair valve.
4. Bellows damaged by waterhammer. Replace bellows, eliminate cause of waterhammer.
Slow warm-up or
temperature of equipment
drained too low.
1. Steam pressure too low for temperature required by
process.
a. Pressure throttled by thermostatically controlled steam
supply valve.
b. Increased demand for steam throughout the plant.
c. Steam piping too small for adequate supply.
a. Check for lowest throttled pressure and increase if feasible.
b. Increase boiler capacity if possible. Shut down
unneeded equipment.
c. Increase steam pressure or replace piping with larger size.
2. Pressure differential across trap too low.
a. Steam pressure less than when trap was installed.
b. Return line pressure higher than when the trap was
installed.
a. Raise pressure to former level.
b. Return main too small. Other traps discharging live steam
into return main. Repair or replace faulty traps. Obstruction
in return main or discharge piping.
3. Short circuiting caused by group trapping. See Installation Step 5.
4. No cooling leg between equipment and trap, or cooling leg
is insulated. See Installation Step 6.
5. Trap steam-locked.
a. Long horizontal piping between equipment and trap.
b. Trap above drain outlet of equipment - no water seal at
bottom of riser.
c. Siphon-drained equipment - rotary dryers and tilting
jacketed kettles.
a. See Installation Step 2.
b. See Installation Steps 12 and 13.
c. See Installation Step 13.
6. Apparatus drained by siphon pipe. Examine siphon for break or leak.
Table 1. Troubleshooting
7
N650 Series

0011534-B
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McKinney, Texas 75070 USA
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VCIMD-16893 © 2021 Emerson Electric Co. All rights reserved 11/21.
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Solutions business unit of Emerson Electric Co. The Emerson logo is a
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property of their prospective owners.
The contents of this publication are presented for informational purposes only,
and while every e󰀨ort has been made to ensure their accuracy, they are not to
be construed as warranties or guarantees, express or implied, regarding the
products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We
reserve the right to modify or improve the designs or specications of such
products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use
or maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Electric Co. product remains solely with
the purchaser.
Parts Ordering
When corresponding with your local Sales Office about
N650 Series, always reference the assembly number.
N650 Series