Spirax Sarco FT 43 Series User manual

IM-S02-30 ST Issue 6 1
FT43, FT44, FT46 and FT47
Ball Float Steam Traps
Installation and Maintenance Instructions
IM-S02-30
ST Issue 6
0667050/6
Printed in the UK © Copyright 2002
1. General
safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
and Spare parts

IM-S02-30 ST Issue 62
1. General safety information
Safe operation of these units can only be guaranteed if they are properly installed,
commissioned and maintained by a qualified person (see Section 11 of the attached
Supplementary Safety Information) 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.
Warning
The cover gasket contains a thin stainless steel support ring which may cause physical
injury if not handled and disposed of carefully.
Isolation
Consider whether closing isolating valves will put any other part of the system or
personnel at risk. Dangers might include; isolation of vents and protective devices or
alarms. Ensure isolation valves are turned off in a gradual way to avoid system shocks.
Pressure
Before attempting any maintenance consider what is or may have been in the pipeline.
Ensure that any pressure is isolated and safely vented to atmospheric pressure before
attempting to maintain the product, this is easily achieved by fitting Spirax Sarco
depressurisation valves type DV (see separate literature for details). Do not assume
that the system is depressurised even when a pressure gauge indicates zero.
Temperature
Allow time for temperature to normalise after isolation to avoid the danger of burns and
consider whether protective clothing (including safety glasses) is required.
Disposal
These products are recyclable. No ecological hazard is anticipated with the disposal of
these products providing due care is taken.

IM-S02-30 ST Issue 6 3
2.1 General description
The FT range of ball float traps can be supplied in cast iron, carbon steel, stainless steel and
SGiron.ATÜVapprovedfoundryproducesthebodiesandcoversfortheFT44,FT46andFT47.
Allballfloat trapsarefittedwithanintegralautomatic airventingfacilityandthe rangeisavailable
with horizontal flanged connections or vertical flanged connections designated suffix 'V'.
A steam lock release option is also available designated suffix 'C'.
If required, the covers can be drilled and tapped 3/8" BSP or NPT for the purpose of fitting a drain
valve.
Note: For additional information see the following Technical Information Sheets:
Product Material Section TI reference Capacities
FT43 DN25 - 50 Cast iron Section 2.2 TI-S02-21 TI-S02-35
DN80 - 100 Cast iron Section 2.2 TI-S02-22 TI-S02-35
FT44 DN15 - 50 Carbon steel Section 2.3 TI-S02-14 TI-S02-36
DN80 - 100 Carbon steel Section 2.3 TI-S02-23 TI-S02-36
FT46 DN15 - 50 Stainless steel Section 2.4 TI-P143-01 TI-S02-36
FT47 DN15 - 50 SG iron Section 2.5 TI-P142-01 TI-S02-36
2. General product information

IM-S02-30 ST Issue 64
0
0
50
100
150
220
24 6810 12 14 16
13*
Pressure bar g
Temperature °C
Steam
saturation
curve
The product must not be used in this region.
*PMO Maximum operating pressure recommended for saturated steam is 13 bar g (188 psi g).
A-B Flanged BS 4504 PN16 (DN25 to 100).
A-C Flanged ANSI 150 flat face and ANSI 125 (DN25 to 50).
A-D Flanged JIS/KS 10 (DN25 and 100).
DPMX - Maximum differential pressure
Size FT43-4.5 FT43-10 FT43-14
DN25 to 100 4.5 bar 10 bar 13 bar
Note: The FT43 range of float traps are limited to a PMO equal to DPMX.
2.2 FT43 - Cast iron
Sizes and pipe connections
Horizontal - DN25, 40, 50, 80 and 100
Vertical - DN25, 40 and 50
Standard flanges are BS 4504 and PN16. On request JIS/KS 10, ANSI 125 and ANSI 150 flat
face flanges with drilled and tapped holes can be provided.
Limiting conditions (ISO 6552)
Body design conditions PN16
PMA - Maximum allowable pressure 16 bar g (232 psi g)
TMA - Maximum allowable temperature 220°C (428°F)
PMO - Maximum operating pressure 13 bar g (188 psi g)
TMO - Maximum operating temperature 220°C (428°F)
Designed for a maximum cold hydraulic test pressure of: 24 bar g (348 psi g)
Operating range
A
Fig. 1 DN25 shown
BC
D

IM-S02-30 ST Issue 6 5
0
0
100
200
300
10 20 30 40
32*
Pressure bar g
Temperature °C
CDB
The product must not be used in this region.
*PMO Maximum operating pressure recommended for saturated steam is 32 bar g (464 psi g).
A-B Flanged BS 4504 PN40 and ANSI 300.
A-C Flanged ANSI 150.
A-D Flanged JIS/KS 20.
DPMX - Maximum differential pressure
Size FT44-4.5 FT44-10 FT44-14 FT44-21 FT44-32
DN15, 20 and 25 4.5 bar 10 bar 14 bar 21 bar 32 bar
DN40, 50, 80 and 100 4.5 bar 10 bar - 21 bar 32 bar
Note: The DN40, 50, 80 and 100, FT44 float traps are limited to a PMO equal to DPMX.
2.3 FT44 - Carbon steel
Sizes and pipe connections
Horizontal - DN15, 20, 25, 40, 50, 80 and 100
Vertical - DN15, 20, 25, 40 and 50
Standard flanges are BS 4504/DIN PN40 with face-to-face dimensions in accordance with
EN 26554 (Series 1). ANSI B 16.5 Class 150 and 300 and JIS/KS 20* are also available with
extended face-to-face dimensions (*vertical traps are in accordance with EN 26554 - Series 1).
ANSI/JIS/KS flanges are supplied with tapped holes to receive flange bolts. ANSI flanges have
UNC threads and JIS/KS have metric threads.
Limiting conditions (ISO 6552)
Body design conditions PN40
PMA - Maximum allowable pressure 40 bar g (580 psi g)
TMA - Maximum allowable temperature 400°C (752°F)
PMO - Maximum operating pressure 32 bar g (464 psi g)
TMO - Maximum operating temperature 300°C (572°F)
Designed for a maximum cold hydraulic test pressure of: 60 bar g (870 psi g)
Note: The trap in its complete operational form must not be subjected to a pressure greater than
48 bar g (696 psi g) otherwise damage to the mechanism may result.
Operating range
A
Fig. 2 DN15 shown
Steam
saturation
curve

IM-S02-30 ST Issue 66
2.4 FT46 - Stainless steel
0
0
100
200
300
400
10 13.6 20 25.5* 30 40
Pressure bar g
Temperature °C
Steam
saturation
curve B
A
C
D
The product must not be used in this region.
*PMO Maximum operating pressure recommended for saturated steam is 25.5 bar g (369 psi g).
A-B Flanged BS 4504 PN40 and ANSI 300.
C-D Flanged ANSI 150.
DPMX - Maximum differential pressure
Size FT46-4.5 FT46-10 FT46-14 FT46-21 FT46-32
DN15, 20 and 25 4.5 bar 10 bar 14 bar 21 bar 32 bar
DN40 and 50 4.5 bar 10 bar - 21 bar 32 bar
Note: The DN40 and 50, FT46 float traps are limited to a PMO equal to DPMX.
Sizing and pipe connections
DN15, 20, 25, 40 and 50
Standard flanges are BS 4504/DIN PN40 with face-to-face dimensions in accordance
with EN 26554 (Series 1). ANSI B 16.5 Class 150 and 300 flanges are also available with
face-to-face dimensions in accordance with EN 26554 (Series 1). ANSI flanges are supplied
with tapped (UNC) holes for flange bolts.
Limiting conditions (ISO 6552)
Body design conditions PN40
PMA - Maximum allowable pressure 40 bar g (580 psi g)
TMA - Maximum allowable temperature 400°C (752°F)
PMO - Maximum operating pressure 25.5 bar g (369 psi g)
TMO - Maximum operating temperature 300°C (572°F)
Designed for a maximum cold hydraulic test pressure of: 60 bar g (870 psi g)
Note: The trap in its complete operational form must not be subjected to a pressure greater than
48 bar g (696 psi g) otherwise damage to the mechanism may result.
Operating range
Fig. 3 DN50 shown

IM-S02-30 ST Issue 6 7
300
200
100
0010 20 30 32* 40
Pressure bar g
Temperature °C
Steam
saturation
curve B
A
C
The product must not be used in this region.
*PMO Maximum operating pressure recommended for saturated steam is 32 bar g (464 psi g).
A-B Flanged BS 4504 PN40.
A-C Flanged ANSI 150.
DPMX - Maximum differential pressure
Size FT47-4.5 FT47-10 FT47-14 FT47-21 FT47-32
DN15, 20 and 25 4.5 bar 10 bar 14 bar 21 bar 32 bar
DN40 and 50 4.5 bar 10 bar - 21 bar 32 bar
Note: The DN40 and 50, FT47 float traps are limited to a PMO equal to DPMX.
Sizing and pipe connections
DN15, 20, 25, 40 and 50
Standard flanges are BS 4504/DIN PN40/PN25 with face-to-face dimensions in accordance
with EN 26554 (Series 1). On request ANSI B 16.5 Class 150 flanges can be supplied with
face-to-face dimensions in accordance with EN 26554 (Series 1). Flanges have tapped (UNC)
bolt holes on Class 150 versions.
Limiting conditions (ISO 6552)
Body design conditions PN40
PMA - Maximum allowable pressure 40 bar g (580 psi g)
TMA - Maximum allowable temperature 300°C (572°F)
PMO - Maximum operating pressure 32 bar g (464 psi g)
TMO - Maximum operating temperature 300°C (572°F)
Designed for a maximum cold hydraulic test pressure of: 60 bar g (870 psi g)
Note: The trap in its complete operational form must not be subjected to a pressure greater than
48 bar g (696 psi g) otherwise damage to the mechanism may result.
Operating range
2.5 FT47 - SG iron
Fig. 4 DN50 shown

IM-S02-30 ST Issue 68
3. Installation
Note: Before actioning any installation observe the 'Safety information' in Section 1.
Warning
The cover gasket contains a thin stainless steel support ring, which may cause
physical injury if not handled and disposed of carefully.
Referring to the Installation and Maintenance Instructions, name-plate, and Technical Information
Sheet, check that the product is suitable for its intended use.
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 Determine the correct installation situation and direction of fluid flow – please be aware that
the flow direction is not the same for all FT trap types or sizes. However the flow direction
will be clearly marked on the trap body.
3.3 Remove protective covers from all connections.
3.4 The trap must be fitted with the float arm in a horizontal plane so that it rises and falls
vertically. Note: The trap can be visually checked for its correct orientation by reading the
writing on the body, cover, and name-plate. If installed correctly the writing will be seen to
be displayed the correct way up.
3.5 The trap should be fitted below the outlet of the steam system, with a small drop leg
immediately proceeding the trap, typically 150 mm (6") . See Fig. 5. If no drop leg is allowed
forthenitmay be possible(underlowloadconditions)for steam toflowoverthecondensate
in the bottom of the pipe and reach the trap.
Fig. 5
FT

IM-S02-30 ST Issue 6 9
Fig. 6 Slow speed cylinder drainage with system unit
Air vent
Float
trap Sight
glass
Condensate out
Strainer
Air bottle
Cylinder
3.6 Float traps should be fitted as close to the outlet of the plant to be drained as possible
otherwise the trap can steam lock. Steam locking occurs when the pipe between the
condensate outlet and the steam trap fills with steam and prevents condensate from
reachingthetrap.Thiscan lead to the system waterlogging which will affect plantefficiency.
It is very similar to the air locking experienced in water systems.
Themostcommonapplicationwheresteamlockingisariskisonrotatingcylindersandother
applications where condensate is removed via a dip tube or siphon pipe. Steam locking can
easily be prevented by fitting the trap with a combined thermostatic air vent and steam lock
release valve (SLR), Fig. 6 shows an FT-C trap fitted on a slow speed cylinder.
The SLR valve is opened by turning the spindle anticlockwise. The standard factory setting
is ½turn which equates to an approximate steam 'bypass' of 22 kg/h @ 10 bar.
SiteadjustmentoftheSLR can be achieved by turning anticlockwise to increase thebypass
flow, and clockwise to reduce the flow.
When draining from a high speed cylinder application, there is need for large amounts of
blow-through steam to assist the flow of condensate out of the cylinder via the siphon tube.
In such cases the SLR cannot handle such large amounts and an external bypass with an
adjustable needle valve is required. See Fig. 7.

IM-S02-30 ST Issue 610
Fig. 7 High speed cylinder with float trap and parallel blow-through valve
Rotating
cylinder
Float trap with
external bypass
Steam in
Rotary joint with
flexible couplings
Condensate
out
3.7 If the trap is to be situated in an exposed position, it should be either lagged or drained by
a separate small thermostatic trap such as the Spirax Sarco No.8, or Bydrain.
3.8 Always fit a non-return (check) valve downstream of any steam trap which discharges into
condensate return lines where back pressure is experienced. This is not commonly caused
byarisingcondensate line. The check valve will prevent the steamspaceflooding when the
inlet pressure is reduced or the steam is shut off.
3.9 Ensure adequate space is left to remove the cover from the body for maintenance – the
maximum withdrawal to remove the cover is 200 mm (8").
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).