Steam traps

Fixed temperature discharge

5.4.3

ISO 9001

Steam

saturation

curve

Maximum load

Minimu m load

TI-P084-01

ST Issue 7

FT12

Cast Iron

Float/Orifice Trap for High Capacity Applications

Cert. No. LRQ 0963008

Description

The FT12 is a unique steam trap which combines a large fixed orifice

to handle very high condensate loads up to differential pressures of

4 bar. An integral float trap mechanism provides a variable capacity

in addition to the orifce. Minimum flowrates are required to avoid

blowthrough and these depend on the orifice selected A, B, C or D.

The FT12 is manufactured in cast iron with DN150 (6") flanged

connections. It is designed specifically for the sugar industry, which

has inherently low pressure, high load steam systems.

This product fully complies with the requirements of the European

Pressure Equipment Directive 97/23/EC.

This product is available with certification to EN 10204 2.2.

Note: Allcertification/inspection requirements must be stated at

the time of order placement.

Size and pipe connections

DN150, flanged PN16 and ANSI 125

(Flanges to BS 10 Table D can be supplied to special order).

Limiting conditions

Body design conditions

PMA - Maximum allowable pressure

TMA - Maximum allowable temperature

PMO - Maximum operating pressure

TMO - Maximum operating temperature

Designed for a maximum cold hydraulic test pressure of 24 bar g

Operating range

220

200

150

100

50

0

0

2

4*

6

8

10

12

14

16

Pressure bar g

1

2

7

3

1

Standards

Certification

PN16

16 bar g

220°C

4 bar g

220°C

8

9

6

5

4

Capacities

Minimum flow

FT12-A - 44% of graph

FT12-B - 55% of graph

FT12-C - 62% of graph

FT12-D - 68% of graph

The FT12 has a fixed orifice combined with a float mechanism.

There is a minimum flowrate which must be present to ensure that

the orifice does not waste steam. This minimum flow is indicated as

a percentage flow of the maximum hot condensate flow as shown on

the capacity graph.

Example: Maximum condensate load from a process is 85 000 kg/h

at 3 bar pressure differential. The minimum load is 57 000 kg/h.

Whilst the B, C or D models will pass the maximum load the B model

has a minimum flow at 49 000 kg/h where as the C and D models

require a higher minimum load of 62 000 kg/h and 85 000 kg/h

respectively. In this example an FT12-B would be selected as the

minimum flowrate of the trap is 49 000 kg/h.

* PMO

The product must not be used in this region.

Maximum operating pressure.

Note: The trap is available with a choice of four orifice plates suitable

for various capacities: FT12-A, B, C and D. Each orifice option has a

maximum and minimum flowrate. See the capacity chart opposite.

150 000

100 000

90 000

80 000

70 000

60 000

50 000

40 000

30 000

20 000

10 000

0.07 0.1

Orifice option

D

C

B

A

How to select/size the trap

Materials

No. Part

1 Body

Material

GG25

BS 3692 Gr. 8.8

BS 3692 Gr. 8

Cover bolts

Cast iron

Steel (M22 x 90)

Steel

Reinforced exfoliated graphite

2

3 Body gasket

4

Main valve

assembly

5

Main valve

assembly gasket

6

Main valve

assembly bolts

7 Ball float

8 Orifice plate

9 Orifice plate studs and nuts

Cover nuts

Stainless steel BS 3146 Pt2 ANC2

Reinforced exfoliated graphite

Stainless steel (M8 x 20)

Stainless steel

Stainless steel

Stainless steel

BS 1449 304 S16

304

0.2

Differential pressure bar (x 100 = kPa)

3

0.3

0.5 0.7

1

2

4

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification.

© Copyright 2003

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