Steam traps

Inverted bucket

Dimensions / weights (approximate) in mm and kg

Weight

Screwed

SW

A

90

90

165

PN40

A1

150

150

160

ANSI

150

A1

150

150

160

ANSI

300

A1

150

150

160

B

167

167

167

Withdrawal

C

distance

D

100

100

100

110

110

110

3.0

3.0

3.5

4.7

5.3

6.0

4.6

5.0

5.7

Size

DN15 1⁄2"

DN20 3⁄4"

DN25 1"

➤

A

➤

B

Screwed

SW

PN40

ANSI

ANSI

150

300

D

5.0

5.8

6.5

➤

A1

➤

Spare parts

The spare parts that are available are detailed below.

Available spare

Internal set

(state pressure range)

4, 8, 9, 10, 11 (2 off)*, 12, 13, 14,

15, 16 (2 off), 17

D

*

Strainer set

Cover and strainer gasket (packet of three)

Note: Item 11 (valve guide plate screws) are not shown.

5, 18

8, 18

Always order spare parts by using the description given in the

column headed 'Available spare' and state the size, model number

and pressure rating of the trap.

Example: 1 - Internal set for a Spirax Sarco DN20 SCA15 inverted

bucket steam trap.

8

9

C

How to order spares

Capacities (in accordance with ISO 7842)

700

500

400

300

200

100

10

14

4

5

18

Recommended tightening torques

Item No

12,16

13

17

15

60

0.5

1

2

345

10

2

0

3040

Installation

Pressure bar g

The trap must be installed with the body upright so that the bucket

is rising and falling vertically. The inlet and outlet connections

should be in a horizontal plane, with the trap installed below the

drain point so that a water seal can be maintained around the

open end of the bucket.

Maintenance

Before undertaking any maintenance on the inverted bucket steam

trap it must be isolated from both supply line and return line and any

pressure allowed to safely normalise to atmosphere. The trap should

then be allowed to cool. It is recommended that new gaskets are

used whenever maintenance is undertaken.

The cover gasket contains a thin stainless steel support ring

which may cause physical injury if it is not handled and disposed

of carefully.

Isolate the inverted bucket steam trap, remove body by undoing

cover bolts. Remove complete bucket assembly by undoing the two

screws. Remove valve seat. Screw in new valve seat to torque

figures shown, using a little jointing paste on the threads and

making sure that joint faces are clean. Fix new bucket assembly in

position by using new screws which are supplied, centralise valve to

the orifice and tighten screws to torque figures shown. Using new

gaskets, refit body to torque figures shown.

Howtoorder

Example: 1 off Spirax Sarco DN20 SCA15 inverted bucket steam

trap with steel body, and flanged to PN40.

6

(not an available spare)

N m

40 - 45

170 - 190

35 - 40

2.5 - 3.0

TI-P077-05 ST Issue 3

How to fit valve and seat assembly

Part

mm

or

Cover bolts

14

M10

Strainer cap

5

M28

Valve seat

17

M16

Valve guide

plate screws

Posidrive

M4 x 6

SCA Series Steel Inverted Bucket Steam Traps

*3

6

9

*11

*Note: Items 3 and 11 are not illustrated.

5.6.16

➤

➤

SCA3

SCA5

SCA11

SCA15

SCA30

C

a

p

a

c

i

t

y

k

g

/

h

➤

➤

➤

➤

➤

➤

SCA40