Spirax Sarco FT 43 Series Manuale utente

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

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

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

Fig. 1 DN25 shown

IM-S02-30 ST Issue 6 5

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

Fig. 2 DN15 shown

Steam

saturation

curve

IM-S02-30 ST Issue 66

2.4 FT46 - Stainless steel

100

200

300

400

10 13.6 20 25.5* 30 40

Pressure bar g

Temperature °C

Steam

saturation

curve B

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

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

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).

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