18029 50 /11
IM -P18 0- 31
CMGT Issue 11
BT6-B
Sanitary Balanced Pressure Thermostatic Steam Trap
Installation and Maintenance Instructions
1. Safety information
IM- P180-31 CMGT Issue 11
2. General product information
3. Installation
4. Commissioning
5. Operation
6. Spare parts and maintenance
© Copyright 2019
Printed in GB
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IM- P180-31 CMGT Issue 11
1. Safety information
Safe operation of these products can only be guaranteed if they are properly installed, commissioned,
used and maintained by qualified 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 th e intended use/application.
The products listed below comply with the requirements of the Pressure Equipment Directive (PED)
and all fall within categor y 'SEP'. It should be noted t hat products within this category are required
by the Directive not to carry the mark.
i) The product has been specifically designed for use on steam, air or water/condensate which
is in Group 2 of the above mentioned Pressure Equipment Directive (PED). The products’ use
on other fluids may be possible but, if this is contemplated, Spirax Sarco should be contac ted
to conf irm the sui tability 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 fitted, or if malfunction of the product could result in a dangerous overpressure or
overtemperat ure occur rence, ensure a safet y device is included in the system to prevent such
over-limit situations.
iii) Determine the correct installation situation and direction of fluid flow.
iv) Spira x Sarco products are not intended to withstand external stresses that maybe induced by
any system to which they are fitted. It is the responsibility of the installer to consider these
stresses and take adequate precautions to minimise them.
v) Remove protective covers from all connections and protective film from all name- plates, where
appropriate, before installation on a steam or other high temperature applications.
1.2 Access
Ensure safe acces s and if necessary a safe working platform (suitably guarded)before attempting
to work on the product. Arrange suita ble lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
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, fire hazard (e.g. during welding), excessive noise, moving machinery.
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1.6 The system
Consi der the ef fect on the c omplete s ystem of the w ork propo sed. Will any p roposed ac tion (e.g. cl osing
isolation valves, electrical isolation) put any other par t of the system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering ineffective of controls
or alar ms. 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 gaug e indicat es zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
If par ts made from Viton have been subjected to a temperature approaching 315 °C (599 °F)
or higher, they may have decomposed and formed hydrofluoric acid. Avoid skin cont act and
inhalation of any fumes as the acid will cause deep skin burns and damage the respiratory system.
If par ts made from PTFE have be en subjected to a temp erature approaching 260 °C (500 °F)
or higher, they will give off toxic fumes, which if inhaled are likely to c ause temporary discomfor t.
It is essential for a no smoking rule to be enforced in all areas where PTFE is stored, handled, or
processed as per sons inhaling the fumes from burning tobacco contaminated with PTFE par ticles
can develop 'polymer fume fever'.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and / or consumab les available. Use only
genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consi der whethe r you and/or oth ers in the vic inity req uire any prote ctive clot hing to prote ct 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 car ried 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 wor k' system is in force it must be complied with. Where there is no such
system, it is recom mended that a responsible per son should know what work is going on and,
where necessar y, arrange to have an assistant whose primar y responsibilit y is safety.
Post 'warning notices' if nec essary.
1.12 Handling
Manual handling of large and / or heavy produc ts may present a risk of injury. Lifting, pushing,
pulling, carr ying or supp orting 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. Please refer to Section 6.2 for additional information on product handling.
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1.13 Residual hazards
In normal use the ex ternal sur face of the product may be very hot. If used at the maximum p ermitted
operating conditions the surface temperature of some products may reach temperatures in excess
of 177 °C (350 °F).
Take due care when dismantling or removing the product from an installation (refer to Section 6
'Maintenance instructions').
1.14 Freezing
Provision must be made to protect systems which are not self-draining against frost damage in
environments where they may be exposed to temperatures below freezing point.
1.15 Disposal
Unles s otherwi se stated in t he Install ation and Ma intenance I nstruct ions, this p roduct is rec yclable
and no ecological hazard is anticipated with its disposal providing due care is taken.
Viton:
Can be landfilled, when in compliance with National and Local regulations.
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Can be incinerated, but a scrubber must be used to remove Hydrogen Flouride, which is evolved
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from the product and with compliance to National and Local regulations.
Is insoluble in aquatic media.
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PTFE:
Can only be disposed of by approved methods, not incineration.
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Keep PTFE waste in a separate container do not mix it with other rubbish, and consign it to a
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landfill site.
1.16 Returning products
Custom ers and stockists are reminded that under EC Health, Safety and Environment Law, when
retur ning produ cts to Spi rax Sarco t hey must prov ide infor mation on a ny hazard s and the pre caution s
to be taken due to contamination residues or mechanical damage which may present a health,
safety or environmental risk. This information must be provided in writing including Health and
Safet y data sheets relat ing to any substances identified as hazardous or potentially hazardous.
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2. General product information
2.1 Description
The Spirax Sarco BT6 -B sanitary balanced pressure thermostatic steam trap is designed to remove
condensate from clean and pure steam applications with minimal c ondensate retention. Applications
include sterile steam barriers, block and bleed installations, mains drainage and CIP/SIP of vessels and
reactors and process lines. Manufactured in 316L, the crevice free body design of the BT6-B incorporates
a 15° angled seat to ensure full drainability.
The standard element is ex tremely sensitive to changes in condensate temperature and is designed to
open with a minimum of sub-cooling, less than 2 °C from steam saturation temperature at pressures
below 2.5 bar g for typical operating conditions. Exact operating performance may be affected by
operating pressure, installation and ambient conditions. Each trap is individually packaged within an ISO
CLASS 7 'clean' environment with protective end caps and sealed in a protective plastic bag.
Options:
Fixed bleed to ensure 'FAIL OPEN' operation.
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Mechanical and electropolishing to 0.375 μm Ra (15 micro-inch Ra, ASME BPE SFV4).
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For applic ations requiring closer to steam saturation temperatures, for example, critical SIP
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applications, please consult Spirax Sarco.
Standards
The BT6-B has been designed and built in general accordance with ASME BPE.
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The unit also complies with the requirements of the Pressure Equipment Directive (PED).
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The seal part is compliant with:
FDA CFR Title 21. Paragraph 177. 1550.
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USP Class VI Biological Reactivity Cytotoxicit y Testing In-Vitro <87> & In -Vivo <88> extracted at
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121 °C for 1 hour.
ADI Free (Animal Derived Ingredients) for materials used, manufacturing processes involved in
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producing the part.
Certification
This product is available with the following certication:
EN 10204 3.1 material certicates (pressure containing parts)
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EN 10204 3.1 material certicates (wetted parts, including element ll) subject to additional cost.
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Typical Internal surface nish certicates.
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Specic internal surface nish c ertic ates available at point of order request, and may be subject to
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additional cost.
Certicate of compliance for FDA, USP and ADI free.
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TSE/BSE Free Statement.
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Certicate of compliance EC1935:2004 Food Contact Materials.
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Declaration of conformity BS EN ISO 146 44-1:2015 Class 7 Clean Room.
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Note: All certication/inspection requirements must be stated at the time of order placement, and may be
subject to additional cost.
Note: For further product data see the following Technical Information Sheet, TI-P180-30
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2.2 Sizes and pipe connections
½", ¾", 1" and 1½" sanitar y clamp ends to ASME BPE.
For other end connections please consult Spirax Sarco.
Fig. 1
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0
100
150
177
2 4 6 8 10
0 20 40 50 60 100 120 140
2.3 Pressure/temperature limits (ISO 6552)
Pressure psi g
Temperature °F
300
Steam saturation cur ve
50
Temperature °C
0
Pressure bar g
The product must not be used in this region.
The product should not be used in this region as damage to the internals may occur.
Note: For hygienic/sanitary clamp ends the maximum pressure/temperature may be restricted by the gasket
or sanitary clamp used. Please consult Spirax Sarco.
Body design condition PN10
PMA Maximum allowable pressure 10 bar g @ 140 °C (145 psi g @ 284 °F)
TMA Maximum allowable temperature 177 °C @ 9.2 bar g (350 °F @ 133 psi g)
Minimum allowable temperature -254 °C (-425 °F)
PMO Maximum operating pressure for saturated steam service 6 bar g (87 psi g)
TMO Maximum operating temperature 165 °C @ 6 bar g (329 °F @ 87 psi g)
Minimum operating temperature 0 °C (32 °F)
Designed for a maximum cold hydraulic test pressure of: 15 bar g (218 psi g)
200
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3. Installation
Note: Before actioning any installation obser ve 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:
Check materials, pressure and temperature and their maximum values. If the maximum operating
3.1
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.
Determine the correct installation situation and the direction of fluid flow.
3.2
Remove protective covers from all connections and protective film from all name-plates, where
3.3
appropriate, before installation on a steam or other high temperature applications.
The trap is designed to be f itted in vertical lines with flow downwards so that it can be self-draining.
3.4
Check flow arrow for correct orientation. Fittings, clamps and gaskets for pipe end connections are
not supplied. Do not expose the element to superheat conditions sinc e over expansion may result.
Installation should include a suitable cooling leg to avoid condensate back-up into process equipment
under normal operating conditions.
Caution: Do not overtighten clamp. This may cause the seal to spread/extrude and inter face with
element frame. It is normally only necessar y to take up slack and tighten the nut by half a turn
maximum.
If the trap is to be subjected to hydraulic testing (max pressure 15 barg) - it is essential that the
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internals are removed and that the standard gasket is substituted for a Viton gasket.
When swapping out the gasket or removing the internals. the clamp should be re-torqued to 50 lbf.
in (5.65 Nm).
Note: The body and element must be handled carefully to ensure that the machined sur faces are not damaged.
Note: If the trap is to discharge to atmosphere ensure it is to a safe place, the discharging fluid may be at
a temperature of 100 °C (212 °F).
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4. Commissioning
After installation or maintenance ensure that the system is fully functioning. Carry out tests on any alarms
or protective devices.
Note: As with all steam systems it is ver y important that the pressure is built up slowly to avoid possible
damage to any sensitive equipment.
5. Operation
The operation relies on a stainless steel capsule that is filled with a temperature sensing fluid. During cold or
start-up conditions the capsule will be fully open allowing large volumes of air, condensate and/or CIP fluid
to be drained. As the system approaches steam temperature the fluid in the capsule expands and the valve
closes the trap to prevent live steam loss. This closure oc curs very c lose to steam temperature to ensure
efficient drainage of the system.
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6. Spare parts and maintenance
Note: Before actioning any maintenance programme obser ve the 'Saf ety information' in Section 1.
6.1 Spare parts
The spare parts available are shown in solid outline. Parts drawn in a grey line are not supplied as spares.
Capsule element assembly 3 and 5
These are the available spare parts.
No other parts are supplied as spares.
How to order spares
Always order spares by using the description given in the column headed 'Available spares' and state the
size and type of trap.
Example: 1 - Capsule element assembly for a ½" BT6- BH sanitar y balanced pressure thermostatic steam trap.
Seal 5
Body (outlet) including seat 2
Fig. 2
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Not an available spare
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5
3
2
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6.2 Maintenance
Before undertaking any maintenance on the trap it must be isolated from the supply line and return line and
any pressure allowed to slowly normalise to atmosphere. The trap assembly should then be allowed to cool.
Note: Damage to the c apsule element assembly will occur if the body clamp is removed before the trap has
cooled to 60 °C or below.
Note: The body and element must be handled c arefully to ensure that the machined surfaces are not damaged.
Remove the sanitary clamps from the pipeline connections and remove the whole trap from the pipeline.
Remove the body sanitary clamp (4), then the trap inlet and outlet body including the seat (2), seal (5) and
capsule element assembly (3) can be removed for cleaning or replacement. Reassemble using a new seal
and with the valve head in position to close onto the seat orifice. Replace and tighten sanitary clamps and
put back into service. Check for leaks and retighten as necessary.
Note: On occasions the gasket can be difficult to remove from the metal par ts. The element mounting plate
can bond to the gasket. To avoid damage, do not attempt to pull the element away by levering or pulling the
welded capsule. Instead gently prise the gasket from the valve body as shown in C below.
A B C D
Reassemble usi ng a new sea l an d wi th the val ve head in positi on to clos e on to the sea t or if ic e. Replac e and
tighten sanitary clamps and put back into service. Check for leaks and retighten as necessary.
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