Steam traps

Inverted bucket

ISO 9001

5.6.15

A

Steam

saturation

curve

D

C

41.56*

SCA3

SCA5

SCA11

SCA15

SCA30

SCA3

SCA5

SCA11

SCA15

SCA30

SCA3

SCA5

SCA11

SCA15

SCA30

Pressure

(at saturation)

14.1 bar g

41.6 bar g

36.1 bar g

TI-P077-05

ST Issue 3

SCA Series

Steel

Inverted Bucket Steam Traps

Cert. No. LRQ 0963008

Description

The Spirax Sarco SCA series is a maintainable carbon steel inverted

bucket steam trap with in-line connections. They are suitable for a

wide range of pressures and incorporate an integral strainer.

Sizes and pipe connections

1⁄2", 3⁄4" and 1" screwed BSP or NPT.

DN15, DN20 and DN25 socket weld ends (ANSI B 16.11),

flanged PN40, ANSI 150 and ANSI 300.

Limiting conditions (ISO 6552)

Maximum operating conditions depend on the orifice size.

1

1

8

0

14

7

2

4

5

6

Materials

No Part

1 Body

2 Cover

* 3 Cover bolts

4 Bucket

5 Screen

6 Strainer cap

7 Inlet tube

8 Cover gasket

9 Valve seat

10 Valve guide plate

* 11 Valve guide plate screws

12 Hinge pin

13 Valve lever

14 Valve head

15 Spring pin

16 Washer

17 Starlock washer

18 'S' type gasket

9

12,16

13

17

15

Body design conditions

PMA - Maximum allowable pressure

TMA - Maximum allowable temperature

Designed for a maximum cold hydraulic test pressure of 78 bar g

ANSI/ASME 300 (PN50)

51 bar g

400°C

Operating range

400

300

200

100

0

B

0

10 14.1* 20

30 36.1*40

51

* PMO

A-B

A - C

A - D

Pressure bar g

The product must not be used in this region.

Maximum operating pressure recommended.

FlangedANSI300,screwedandsocketweld

Flanged BS 4504 PN40 (ISO 7005.1)

Flanged ANSI 150

18

ASTM A105

A216 WCB

ASTM A193 Gr. B7

AISI 304-2B

AISI 304

AISI 416

AISI 304

Differential pressure limitations

Size

DN15 1⁄2"

DN20 3⁄4"

DN25 1"

DPMX - Maximum differential pressure bar

3

5

11

15

30

40

Material

SCA40

SCA40

SCA40

Carbon steel

Carbon steel

Steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Reinforced exfoliated graphite

The SCA15, SCA30 and SCA40 are available as standard and the

SCA3, SCA5 and SCA11 to special request.

Note: The pressure limit on the flange specified should be greater

than the pressure limit of the internal mechanism. The table below

offers guidance.

Flange

ANSI 150

ANSI 300

PN40

Mechanism available

3, 5, 11 (15 limited to 14.1 bar g)

all versions

3, 5, 11, 15, 30 (40 limited to 36.1 bar g)

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

AISI 440C

AISI 304-2B

BS 6105 CI A2-70

AISI 304

AISI 304-2B

AISI 420

AISI 304

AISI 304

AISI 301

AISI 304

* Note: Items 3 and 11 not illustrated.

Certification

The product is available with material certification to EN 10204 3.1.B

as standard. Certification must be specified at the time of order.

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 2004

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