200 Series
Inverted Bucket Steam Traps
Installation and Maintenance Instructions
IM-S03-08
ST Issue 3
0671050/3
Printed in the UK © Copyright 2003
1. General
safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
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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
The product is recyclable. No ecological hazard is anticipated with the disposal of this
product providing due care is taken.
1. General safety information
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2.1 General description
The Spirax Sarco 200 series of cast iron inverted bucket steam traps are designed for
installation in vertical pipework with the flow vertically upwards. They are suitable for a wide
range of pressures and applications up to 17 bar g (246 psi g).
Note: For additional information see the following Technical Information Sheets: TI-S03-03
and TI-S03-04.
2.2 Sizes and pipe connections
½" - 2" screwed BSP or NPT
DN15 - 50 flanged*.
*Flanges meet the requirements of BS 4504 DIN PN16, PN10, PN6, ANSI 125 and ANSI 150.
In some sizes the inlet and outlet flanges are formed from the body casting and have tapped
holes to receive studs.
The stud holes are tapped UNC in ANSI flanges and metric in BS 4504 DIN flanges.
2. General product information
Fig. 1 200 Series screwed trap shown
Traps with flanged connections have bodies and covers which may vary from the one
shown above.
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Screwed
Flanged
ScrewedFlanged
2.3 Limiting conditions (ISO 6552)
Maximum operating conditions depend upon orifice size.
Body design conditions exceeds PN16
PMA - Maximum allowable pressure 22 bar g @ 210°C (319 psi g @ 410°F)
TMA - Maximum allowable temperature 210°C @ 22 bar g (410°F @ 319 psi g)
Designed for a maximum cold hyraulic test pressure of: 34 bar g (493 psi g)
Note: The pressure limit on the flange type used should be greater than the pressure limit of
the internal mechanism (DPMX) selected.
DPMX - Maximum differential pressure bar
DPMX - Maximum differential pressure bar
Size
2 2.5 4 8.5 12.5 13.8 17
½" 211/12 - 211/10 211/8 - 211/7 211/6
¾" 212/16 - 212/12 212/10 - 212/8 212/7
1" 213/24 - 213/20 213/16 213/14 - 213/12
1½" 215/36 - 215/28 215/22 215/20 - 215/18
2" - 216/48 216/40 216/32 216/28 - 216/24
DN15 221/12 - 221/10 221/8 - 221/7 221/6
DN20 222/16 - 222/12 222/10 - 222/8 222/7
DN25 223/24 - 223/20 223/16 223/14 - 223/12
DN40 225/36 - 225/28 225/22 225/20 - 225/18
DN50 - 226/48 226/40 226/32 226/28 - 226/24
2.4 Dimensions / weights (approximate) in mm and kg
TypeSizeABCDWeight
Type 211 ½" 163 108 178 67 2.8
Type 212 ¾" 200 135 229 93 5.2
Type 213 1" 269 188 280 114 12.2
Type 215 1½" 365 238 380 140 27.0
Type 216 2" 432 286 470 185 43.5
Type 221 DN15 215 108 254 - 4.9
Type 222 DN20 286 135 280 - 9.1
Type 223 DN25 305 188 305 121 16.3
Type 225 DN40 370 238 380 140 30.8
Type 226 DN50 450 286 457 165 49.4
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Fig. 2
Type
223
225
226
Type
221
222
Type
211
212
213
215
216
D
A
C Withdrawal distance
A
C Withdrawal distance
D
A
C Withdrawal distance
B
B
B
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3. Installation
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 Determine the correct installation situation and the correct direction of fluid flow.
3.3 Remove protective covers from all connections.
3.4 The trap must be installed with the body upright so that the bucket is rising and falling
vertically. The inlet should be at the bottom with the trap installed below the drain point
so that a water seal can be maintained around the open end of the bucket.
Inverted bucket traps do not permit rapid release of air. On process applications, in
particular, this can lead to slow warm-up times and waterlogging of the steam space. A
separate external air vent is therefore required in parallel to vent air efficiently. Any bypass
should be positioned above the trap. If it is below, and is leaking or left open the waterseal
could be blown away leading to steam wastage. Where inverted bucket traps are fitted
in exposed conditions the possibility of freezing damage can be reduced by
thermal insulation.
On some sizes of flanged traps the inlet and outlet flanges are formed from the
body and cover castings and therefore have tapped holes to receive studs. The stud holes
are tapped UNC for ANSI flanges and tapped metric for BS 4505 / DIN flanges. Ensure
that you have the required tools available before undertaking installation.
3.5 If the trap is installed on a superheated steam system application, then a non return
valve should be fitted on the trap inlet, to prevent the trap from losing its waterseal.
Priming of the trap with water may be required before commissioning.
3.6 Open isolation valves slowly, until normal operating conditions are achieved.
3.7 Check for leaks and correct operation.
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).
4. Commissioning
After installation or maintenance ensure that the system is fully functioning. Carry out tests on
any alarms or protective devices.
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T - 01
Air vent
Fig. 3 Typical installation - Oil storage tanks
Air vent
Bucket
trap
Bucket
trap
5. Operation
Under most conditions the trap will discharge condensate with a 'blast' type action. Under low
load and / or low pressure applications the discharge may tend to 'dribble'.
Condensate is discharged at steam temperature so due care must be given to the site of
the discharge.
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Note:
Before actioning any maintenance programme 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.
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.
How to fit the valve and seat assembly
-
Isolate the trap and disconnect the outlet connection, open up the trap by undoing the
cover nuts (2).
-
Unhook the bucket (5) from the valve lever (11).
-
Remove the valve seat (9).
-
Remove the valve guide plate (7) by undoing the two screws (6).
-
Screw in the new valve seat (9), using a little Loctate 620 on the threads and making sure that
joint faces are clean. See Table 1 for the recommended tightening torques.
-
Fix the new valve guide plate (7) in position by using new screws (6) which are supplied,
hook the new valve lever (11) over the pins (part of the valve guide plate) and centralise
the valve to the orifice and tighten the screws (see Table 1 for the recommended tightening
torques).
-
Refit the cover using new gasket, tighten cover nuts (2) to the recommended tightening
torque figures shown in Table 1 and reconnect the outlet pipework.
-
Open the isolation valve slowly and check for leaks.
Note: In some earlier models of the 212 and 222 trap the hooks on the guide plate were
reversed. This no longer applies and the standard guide plate (7) as shown is the
correct replacement.
This also applies to the spares which are still available for the obsolete 214 and 224 traps.
6. Maintenance
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Table 1 Recommended tightening torques
Item No Size of trap
or
N m (lbf ft)
mm
2 (6 off) ½" - DN15 M8 x 35 18 - 22 (13 - 16)
2 (8 off) ¾" - DN20 M10 x 40 16 - 20 (12 - 15)
2 (10 off) 1" - DN25 M12 x 60 24 - 28 (18 - 21)
2 (12 off) 1½" - DN40 M16x 75 60 - 66 (44 - 32)
2 (12 off) 2" - DN50 M16 x 75 64 - 70 (47 - 51)
½" - DN15 2BAx 5/ 16" 4 - 5 (3 - 4)
¾" - DN20 2BAx 5/ 16" 4 - 5 (3 - 4)
6 1" - DN25 ¼" WHITx ½" 10 - 12 (7 - 9)
1½" - DN40 ¼" WHITx ½" 10 - 12 (7 - 9)
2" - DN50
5
/
16
" WHIT x ½" 14 - 16 (10 - 12)
½" - DN15 ½" A/F 23 - 27 (17 - 20)
¾" - DN20
5
/8" A/F 40 - 44 (29 - 32)
9 1" - DN25
7
/8" A/F 80 - 88 (59 - 65)
1½" - DN40 1¼" A/F 175 - 190 (129 - 140)
2" - DN50 1½" A/F 270 - 300 (199 - 220)
12
½" - 2"
1½" A/F 60 - 70 (44 - 51)
DN15 - DN50
Fig. 4 Screwed version shown
2
9
6
12
7
11
5
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7. Spare parts
5
12
8
7
6
9
11
Valve and seat assembly
The spare parts available are shown in heavy outline. Parts shown in broken line are not
supplied as spares.
Available spares
Valve and seat assembly (state pressure range) 6 (2 off), 7, 9, 11
Bucket 5
Internal tube 12
Cover gasket (packet of 3) 8
How to order spares
Always order spare parts by using the description given in the column headed 'Available spares'
and state the size and full definition of the trap eg. 223/16.
Example: 1 - Valve and seat assembly for a Spirax Sarco DN25, 223 /16 (having a DPMX of
8.5 bar g) cast iron inverted bucket steam trap.
Fig. 5
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