Spirax Sarco STS17.2 User manual

IM-P128-23 ST Issue 6 1
1. Safety information
2. General
product information
3. Installation
4. Commissioning
5. Maintenance
6. Spare parts
© Copyright 2014
Printed in GB
IM-P128-23
ST Issue 6
1289050/6
Double upstream isolation
Single upstream isolation
STS17.2
Stainless Steel
Compact Pipeline Connector Steam Trapping Station
Installation and Maintenance Instructions

IM-P128-23 ST Issue 6
2

IM-P128-23 ST Issue 6 3
1. Safety information
Safe operation of these products can only be guaranteed if they are properly installed,
commissioned, used and maintained by qualied personnel (see Section 1.11) in
compliance with the operating instructions. General installation and safety instructions
for pipeline and plant construction, as well as the proper use of tools and safety
equipment must also be complied with.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended use /application.
The products listed below comply with the requirements of the European Pressure
Equipment Directive 97 /23 /EC and carry the mark when so required. The products
fall within the following Pressure Equipment Directive categories:
Group 1 Group 2 Group 1 Group 2
Product Gases Gases Liquids Liquids
STS17.2 DN15 - DN25 - SEP - SEP
i) The STS17.2 has been specically designed for use on steam and condensate
that is in Group 2 of the above mentioned pressure equipment directive.
For use on other uids contact Spirax Sarco to conrm suitability of the product
for the application being considered.
ii) Check material suitability, pressure and temperature and their maximum and
minimum values. If the maximum operating limits of the product are lower than
those of the system in which it is being tted, or if malfunction of the product could
result in a dangerous overpressure or overtemperature occurrence, ensure a safety
device is included in the system to prevent such over-limit situations.
iii) Determine the correct installation situation and direction of uid ow.
i v ) S p i r a x S a r c o p r o d u c t s a r e n o t i n t e n d e d t o w i t h s t a n d e x t e r n a l s t r e s s e s t h a t m a y
be induced by any system to which they are tted. It is the responsibility of the
installer to consider these stresses and take adequate precautions to minimise
them.
v) Remove protection covers from all connections and protective lm from all
name-plates, where appropriate, before installation on steam or other high
temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded)
before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.

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1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some
previous time. Consider: flammable materials, substances hazardous to health,
extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,
extremes of temperature, hot surfaces, re hazard (e.g. during welding), excessive
noise, moving machinery.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed
action (e.g. closing isolation valves, electrical isolation) put any other part of the
system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering
ineffective of controls or alarms. Ensure isolation valves are turned on and off in
a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling of
closed valves. Do not assume that the system has depressurised even when the
pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
Valves which are tted with PTFE seats must not be subjected to temperatures
above 260°C (500°F). Above these temperatures toxic fumes may be given off.
Avoid inhalation of fumes or skin contact.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and /or consumables
available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and /or others in the vicinity require any protective clothing
to protect against the hazards of, for example, chemicals, high / low temperature,
radiation, noise, falling objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the
product according to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with. Where
there is no such system, it is recommended that a responsible person should know
what work is going on and, where necessary, arrange to have an assistant whose
primary responsibility is safety.
Post 'warning notices' if necessary.

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1.12 Handling
Manual handling of large and /or heavy products may present a risk of injury. Lifting,
pushing, pulling, carrying or supporting a load by bodily force can cause injury
particularly to the back. You are advised to assess the risks taking into account the
task, the individual, the load and the working environment and use the appropriate
handling method depending on the circumstances of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the
maximum permitted operating conditions the surface temperature of some products
may reach temperatures of 230°C (446°F).
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation (refer to 'Maintenance instructions').
1.14 Freezing
Provision must be made to protect products which are not self-draining against
frost damage in environments where they may be exposed to temperatures below
freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions,
this product is recyclable and no ecological hazard is anticipated with its disposal
providing due care is taken. However, the product is fitted with PTFE seats,
special care must be taken to avoid potential health hazards associated with
decomposition / burning of these seats.
PTFE:
- Can only be disposed of by approved methods, not incineration.
- Keep PTFE waste in a separate container, do not mix it with other rubbish, and
consign it to a landfill site.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and
Environment Law, when returning products to Spirax Sarco they must provide
information on any hazards and the precautions to be taken due to contamination
residue's or mechanical damage which may present a health, safety or
environmental risk. This information must be provided in writing including
Health and Safety data sheets relating to any substances identied as hazardous
or potentially hazardous.

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2.1 Description
The STS17.2 compact pipeline connector steam trapping station has been designed to provide
a convenient ready to install trapping solution, which includes: upstream and downstream
isolation valves (2), body incorporating quickfit connector + strainer (1) and check valve (16).
Available types
The STS17.2 is available with either single or double upstream isolation.
The STS17.2 trapping solution incorporates Spirax Sarco quickfit technology, which allows
speedy trap maintenance. The following swivel connector steam traps (sold separately) can
be used with this pipeline connector enabling it to be tailored to suit any application:
- UTD30 and UTD52 thermodynamic steam traps.
- UBP32 balanced pressure steam trap.
- USM bimetallic steam trap.
- UFT32 ball float steam trap.
- UIB30 and UIB30H inverted bucket steam traps.
Standards
These products fully comply with the requirements of the European Pressure Equipment
Directive 97 / 23 / EC.
Certification
These products are available with certification to EN 10204 3.1. Note: All certification /
inspection requirements must be stated at the time of order placement. For other certification
contact Spirax Sarco.
Note: For additional product information see Technical Information Sheet TI-P128-22.
Optional extras
Integral sensor type SSL1 (steam only) or WLSL1 (for waterlogging) for use with R1C
or WLSL1 with DIODE for use with RI6C are available as optional extras, to enable
operational monitoring of the steam trap. Please note that the optional Spiratec SSL1 and
WLSL1 sensors must not be fitted when the STS17.2 is installed in a vertical application.
However a sensor can be fitted to a UTD30 steam trap if fitted.
BDV1 blowdown valve is also available for cleaning the strainer during operation.
Care should be taken when using the BDV1 blowdown valve as the discharge may be hot.
Please note that a BDV1 cannot be used when a Spiratec sensor has been chosen to be
part of the unit.
Retrofit double isolation valve and spool piece to convert a single upstream isolation
version to double isolation.
Insulation jacket is available to reduce heat loss and energy wastage. See separate literature.
2.2 Sizes and pipe connections
½", ¾" and 1" screwed BSP, NPT or socket weld.
½", ¾" and 1" ASME 150 and ASME 300.
DN15, DN20 and DN25 flanged EN 1092 PN40.
2. General product information
Upstream isolation
valve

IM-P128-23 ST Issue 6 7
Fig. 1
STS17. 2 version
with single upstream isolation
Upstream isolation
valve
Downstream isolation
valve
2
2
Upstream isolation
valve
Downstream isolation
valve
16
BDV1
blowdown
valve
2
2
STS17.2 version
with double upstream isolation
Strainer
Optional
Upstream isolation
valve
SSL1
integral
sensor
WLSL1
integral
sensor
Strainer
1
16
2
2
3
3
3
3
3
19
19
Please note that the optional Spiratec
SSL1 and WLSL1 sensors must not be
fitted when the STS17.2 is installed
in a vertical application. However a
sensor can be fitted to a UTD30 steam
trap if fitted.
*
*
*

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System design conditions PN40
PMA Maximum allowable pressure 40 bar g @ 120°C (580 psi g @ 248°F)
TMA Maximum allowable temperature 230°C @ 10 bar g (446°F @ 145 psi g)
Minimum allowable temperature -10°C (14°F)
Maximum operating ASME 150 13.6 bar g (197 psi g)
PMO pressure for saturated
steam service All other connections 17.5 bar g (294 psi g)
TMO Maximum operating temperature 230°C @ 10 bar g (446°F @ 145 psi g)
Minimum operating temperature -10°C (14°F)
Designed for a maximum cold
hydraulic test pressure of: 60 bar g (870 psi g)
Temperature °C
Pressure psi g
Steam
saturation
curve
Temperature °F
Pressure bar g
2.3 Pressure /temperature limits
The product must not be used in this region.
A - B Flanged ASME Class 300, screwed and socket weld.
A - C Flanged EN 1092 PN40.
A - D Flanged ASME Class 150.
A
DC
B

IM-P128-23 ST Issue 6 9
Note: Before actioning any installation observe the 'Safety information' in Section 1.
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended installation:
3.1 Check materials, pressure and temperature and their maximum values. If the maximum
operating limit of the product is lower than that of the system in which it is being fitted,
ensure that a safety device is included in the system to prevent overpressurisation.
3.2 Ensure that the directional arrows on the steam trapping station are pointing in the
same direction as the uid ow within the pipeline.
3.3 Remove protection covers from all connections and protective film from all
name-plates, where appropriate, before installation on steam or other high
temperature applications.
3.4 Make sure that there will be sufficient access for a steam trap to be fitted to the
connector, once the trapping station is installed within the pipeline.
3.5 Although the steam trapping station has great structural integrity, severe misalignment
and / or the pulling effect of incorrect pipe length will have a detrimental effect on the
unit and must be avoided. Particular attention should be paid to correct pipe alignment
such that the inlet pipework and valve are all on the same axis.
3.6 Care must be taken to ensure any dirt in the connecting pipework is removed before
installation, maintain cleanliness during installation since the introduction of dirt can
result in damage to the seats within the isolation valves.
3.7 To install socket welded versions the following procedure should be followed:
-Dismantle the end caps from the body.
-Remove the PTFE seats.
-Weld each end cap to the pipeline.
-Replace the PTFE seats.
-Reassemble.
3.8 Select a quickfit connector steam trap suitable for the application and fit it to the
steam trap station using the guidance provided within the Installation and
Maintenance Instructions provided with the chosen product.
3. Installation

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3.10 Welding into pipeline of socket weld variants
A universal weld procedure covering the requirements of different National and
International Standards and practices is difcult to provide - specically regarding the
welding procedure, welding conditions (run number, consumable size, current, voltage,
polarity), storage of consumables and make / type of consumables due to the abundance
of appropriate consumable suppliers.
Therefore, the information given in Section 3.10.1, is only advice based on British
Standards to be used for guidance on the essential requirements of welding socket
weld STS17.2 trap stations into the pipeline.
This will allow a user to select an appropriate weld procedure from those available
to that user.
This advice is not intended to be a substitute for a weld procedure: it is for
guidance only.
3.9 The STS17.2 can be installed in a horizontal line, or in a vertical line with ow
downwards - See Figure 2.
The STS17.2 MUST NOT be tted in a vertical line with the ow upwards -
See Figure 3.
Please note that the optional Spiratec SSL1 and WLSL1 sensors must not be fitted
when the STS17.2 is installed in a vertical application. However a sensor can be
fitted to a UTD30 steam trap if fitted.
Vertical flow
downwards
Horizontal
flow 4
4
7
Vertical flow
upwards
Fig. 2
Fig. 3

IM-P128-23 ST Issue 6 11
Parent material temperature
Preheat temperature
Only required when ambient is below 5°C
(41°F), then "warm to touch"
Interpass temperature
Not applicable
Post-weld
heat treatment
None required
Run sequence and completed
weld dimensions
Sketch
Reference.- BS 806: 1990: Section 4: Clause 4.7.3
lll
1.4t minimum
1.4t minimum
This edge
not to be completely melted away
Pipe
3.10.1 Welding of an STS17.2 steam trap station
The welding of an STS17.2 steam trap station ½", ¾" and 1" socket weld
to a 15 mm, 20 mm or 25 mm Schedule 40 pipe
Weld preparation
Dimensioned sketch
Diametrical clearance 1.0 mm maximum
Reference - BS 2633: 1987: Section 3.1 and Fig. 9
Welding process
Manual Metal Arc (MMA)
Welding positions(s)
All: Site welded
Welding consumables
Filler material:
Composition - Low C: 23% Cr: 12 % Ni:
Specification - BS 2926: 1984: 23-12 L BR
Shielding gas / flux:
Not applicable
Method of preparation and
cleaning
Socket: As supplied and wire brushed
Pipe: Mechanically cut and wire brushed
Additional information
1. See Section 3.7, page 9.
2. Fit-up using tack welds.
t
STS17.2
Pipe
1.5 mm approximately
Parent materials(s) dimensions
Thickness O/D
(mm) (mm)
½"S TS 17. 2 5.15 32.00
Pipe 2.76 21.30
¾"S TS 17. 2 5.00 37.00
Pipe 2.87 26.70
1" S TS 17. 2 5.60 45.00
Pipe 3.38 33.40
Pipe is to be BS 1600 Schedule 40
Parent materials(s)
Description
Austenitic stainless steel with minimum tensile
strength up to and including 485 N /mm²
Specification(s)
ASTM A182 F316L (STS17.2)
ASTM A106 Gr. B (Pipe)
Material group(s)
R
A1
Joint type
Socket joint to BS 3799 Class 3000 lb
STS17.2
3.9.2 Select a quickt connector steam trap suitable for the application and t to the
STS17.2 using the guidance provided within the Installation and Maintenance
Instructions provided with the steam trap.

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4. Commissioning
After installation ensure that the system is fully functioning. Carry out tests on any alarms
or protective devices. Open isolating valves slowly and ensure that there are no leaks.
5. Maintenance
Note: Before actioning any maintenance programme observe
the 'Safety information' in Section 1.
5.1 Introduction
All work must be carried out by a suitably competent person. Before starting work ensure
that suitable tools are available. Use only Spirax Sarco replacement parts.
5.2 Maintenance
Some maintenance can be completed with the steam trap station in the pipeline, once
the safety procedures have been observed. It is recommended that new gaskets and spares
are used whenever maintenance is undertaken. Ensure that the correct tools and necessary
protective equipment are used at all times. When maintenance is complete open isolation
valves slowly and check for leaks.
5.3 How to replace the strainer screen:
-Before starting any maintenance work make sure that the steam trap station is isolated
from the mains pressure (both steam and condensate) and that any residual pressure
is vented to atmosphere. Allow to cool before commencing work.
-Remove the strainer cap (19) with sensor (23 and 24 i f  t t e d ) e n s u r i n g c a b l e s a r e
not damaged (WLSL1) or optional blowdown valve (25 and 26) and separate it from the
strainer screen (22).
-Once the strainer screen (22) has been cleaned or replaced, place it in the recess of the
strainer cap (19 or 20).
-Using a new cap gasket (21) replace the strainer screen and cap into the body of the
STS17.2 and loosely tighten to ensure the screen and gasket locate correctly.
-Tighten to the recommended torque (see Table 1).
-Ensure sensor cables are not twisted and are secure.
-Recommission and ensure that there are no leaks.
5.4 How to blowdown the strainer screen:
(models fitted with blowdown valve only)
-Periodic blowdown will remove most debris within the strainer screen. Larger debris
may require the whole screen to be removed as detailed in Section 5.3.
- The BDV1 blowdown valve tted to the STS17.2 has an integral valve screw (26), which
can be unscrewed with a 17 mm A/F spanner to blowdown the strainer screen. A lockset
screw will prevent the integral valve screw from disengaging from the valve body (25). A
torque of 22 - 25 N m (16 - 17 lbf ft) is recommended for resealing the integral valve screw.
Warning: Ensure that adequate safety precautions have been taken when opening the
blowdown valve to atmosphere.
For full technical details of the BDV1 see IM-P600-02.

IM-P128-23 ST Issue 6 13
Table 1 Recommended tightening torques
Item or
mm
Torque
N m lbf ft
19 32 A /F M28 x ISP 170 - 190 126 - 140
20 Adaptor 32 A /F M28 x ISP 170 - 190 126 - 140
23 19 A / F 50 - 55 37 - 40
24 24 A / F 50 - 55 37 - 40
25 24 A / F Not applicable Not applicable
26 17 A /F 22 - 25 16 - 18
STS17.2 version
with double upstream isolation
21
22
Fig. 4
23
BDV1
blowdown
valve
SSL1
integral
sensor
WLSL1
integral sensor
19
Standard
20
Adaptor
20
Adaptor
20
Adaptor
25
26
24
Lockset screw
Please note that the optional
Spiratec SSL1 and WLSL1
sensors (items 20 +23 or 24)
must not be fitted when the
STS17.2 is installed in a
vertical application. However
a sensor can be fitted to a
UTD30 steam trap if fitted.
*
*
*

IM-P128-23 ST Issue 6
14
5.5 How to replace or clean the sensor:
-Before starting any maintenance work make sure that the steam trap station is isolated
from the mains pressure (both steam and condensate) and that any residual pressure is
vented to atmosphere. Allow to cool before commencing work.
- If a waterlogging sensor is tted (WLSL1), it will be necessary to disconnect the wiring
at the terminal block. Remove the sensor (23 or 24) from the adaptor (20). (This can be
done in line so long as the adaptor is securely held in place).
-Clean the sensor insulation. If pitting of the insulation has occured, a new sensor should
be tted.
-Clean or replace the strainer screen (22) (whichever action is appropriate for the
condition of the screen).
-Replace the new or cleaned sensor (23 or 24) and screw it into the adaptor (20),
ensuring that the gasket (21) and strainer screen (22) are centralised.
-Tighten to the recommended torque, see Table 2.
-Reconnect the waterlogging sensor as described in IM-P087-34.
-Please note that the optional Spiratec SSL1 and WLSL1 sensors (items 20 +23 or 24)
must not be fitted when the STS17.2 is installed in a vertical application. However
a sensor can be fitted to a UTD30 steam trap if fitted.
5.6 How to replace the check valve
Using a 32 mm A / F spanner, unscrew and remove the check valve blanking plug (16). You
can now see the check valve assembly (17) inside the body. A long 20 mm A/F socket is
required to unscrew the check valve (17) from the body.
Replace with a new check valve assembly (17) and tighten to the recommended torque:
110 - 120 N m (81 - 88 lbf ft).
Using a new gasket (18), replace the check valve blanking plug (16) and tighten to the
recommended torque, see Table 2.
5.7 How to replace the ball valve spares (reference Figure 5):
Maintenance work can be carried out without removing the complete ball valve from the
pipeline. Remove the two upper bolts and nuts (12 +13) and then loosen the lower
two (14 +15). The complete body assembly (2) can can then be removed and any new
parts tted.
Renewal of seats:
1. Remove the body as described above.
2. With body removed, remove the seats (8).
3. Fit new seats, pushing them into the body recesses.
Renewal of the stem seals
1. Remove body as described above.
2. Remove nuts (5and 11) and the belleville washers (10).
3. Replace stem seals (9).
Reassembly
Reassemble in reverse order to instructions given above. The ball valve bolts and
nuts (12 +13 and 14 +15) should be tightened to the recommended torques shown in
Table 2, page 15.

IM-P128-23 ST Issue 6 15
Fig. 5
STS17.2 version
with single upstream isolation
1317
8
9
10
11
5
8
16
15
21
22
18
20
20
20
24
23
BDV1
blowdown
valve
SSL1
integral
sensor
WLSL1
integral
sensor
14
2
12
25 26
Table 2 Recommended tightening torques
Item or
mm
Torque
N m lbf ft
5 and 11 ½" and ¾" 13 5.4 - 8.1 4 - 6
1" 14 10.8 - 13.5 8 - 10
12,14 and 13,15 M6 15 - 17 11 - 12
16 32 A /F M35 x 1.5 190 - 200 140 - 147
20 Adaptor 32 A /F M28 x ISP 170 - 190 126 - 140
23 19 A / F 50 - 55 37 - 40
24 24 A / F 50 - 55 37 - 40
25 24 A / F Not applicable Not applicable
26 17 A /F 22 - 25 16 - 18
*
Please note that the optional
Spiratec SSL1 and WLSL1
sensors (items 20 +23 or 24)
must not be fitted when the
STS17.2 is installed in a
vertical application. However
a sensor can be fitted to a
UTD30 steam trap if fitted.
*
*

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16
5.8 How to fit a double isolation conversion kit
- A retrot kit is available to convert a standard single isolation STS17.2 to a double
isolation (upstream) version. The double isolation conversion kit includes a spool piece
and additional ball valve parts.
-Remove the bolts and nuts (12 +13) and remove the upstream end cap (6).
-Attach the spool piece (27) using the new bolts supplied with the conversion kit in combination
with the existing nuts (12 +13 and 14 +15) and tighten to the recommended torque (see
Table 3).
-Loosely assemble the existing end cap (6) to the other end of the spool piece (27)
using the new nuts supplied with the conversion kit in combination with the existing
bolts (12 +13 and 14 +15), allowing enough gap to slide in the new ball valve and body
assembly (2).
-Slide in the new ball valve and body assembly (2) between the spool piece (27) and
end cap (6) and tighten the bolts and nuts (12 +13 and 14 +15) to the recommended
torque (see Table 3).
-Fit the new handle (3) onto the spindle of the new ball valve assembly (2), ensuring it
is in the correct orientation and secure in place by fitting the washer and nut (4 +5) and
tighten firmly.
12 6 2
13
5
4
2
3
13 12 27
X is a double isolation
conversion kit
Fig. 6 How to fit a double isolation conversion kit to a single isolation valve
14
15
14
15

IM-P128-23 ST Issue 6 17
Table 3 Recommended tightening torques
Item or
mm
Torque
N m lbf ft
5½" and ¾" 13 5.4 - 8.1 4 - 6
1" 14 10.8 - 13.5 8 - 10
12,14 and 13,15 M6 15 - 17 11 - 12

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6. Spare parts
Spare parts
The spare parts are available as indicated below. No other parts are supplied as spares.
Available spares
Isolation ball valve seat and stem seals 8,9
Strainer screen and gasket 21,22
Spare sensor SSL1 Spiratec sensor 23
and sensor gasket WLSL1 diode waterlogging sensor 24
Spiratec retrofit kit Note: State whether an SSL1 or 20,21 +23 or 24
WLSL1 sensor is required.
Check valve assembly 17,18
Double isolation conversion kit (includes spool piece and additional isolation valve) X
BDV1 blowdown valve retrofit kit 20, 21 + 25
How to order spares
Always order spares using the description given in the column headed 'Available spares' and
state the size and model number.
Example: 1 off Spare Spiratec sensor and sensor gasket with WLSL1 diode waterlogging
sensor for a ½" STS17.2 compact pipeline connector steam trapping station.

IM-P128-23 ST Issue 6 19
Please note that the optional Spiratec SSL1 and
WLSL1 sensors (items 20 +23 or 24)must not
be fitted when the STS17.2 is installed in a
vertical application. However a sensor can be
fitted to a UTD30 steam trap if fitted.
*
Fig. 7
8
9
8
21
20
20
20
24
23
25
BDV1
blowdown
valve
SSL1
integral
sensor
WLSL1
integral
sensor
X is a double isolation
conversion kit
X
17
18
*
*

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