Capacities

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(0 to 3 bar g) N type pilot valve

Steam traps

Bimetallic

E type pilot valve (>3 to 21 bar g)

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Hot water capacity

How to size the SP80 and SP100

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Both the SP80 and SP100 bimetallic steam traps are available with

2 different pilot valve assemblies (N type) or (E type) and 4 different

seat types to achieve the rated capacities.

The spare parts available are detailed below. No other parts are

supplied as spares.

To work out the appropriate bimetallic pilot valve and seat size

for your application, follow the sizing procedure listed below:

1. The trap inlet pressure must be known:

Available spares

Pilot valve assembly N type

Pilot valve assembly E type

Gasket kit

Always order spares by using the description given in the column

headed 'Available spares' and state the size and model of the

bimetallic steam trap.

Example: 1 - Gasket kit for a DN80 Spirax Sarco SP80 bimetallic

steam trap.

If the inlet pressure is below 3 bar g then select an N type pilot

valve. If the inlet pressure is above 3 bar g then select an E type

pilot valve.

10, 11, 12, 15, 21

10, 11, 12, 15, 21

6, 12, 15, 18, 21

2. The outlet pressure must be known to determine the differential

pressure across the trap.

How to order spares

5.3.12

3. Depending on the desired capacity and differential pressure

required, use the capacity chart above to choose the seat

diameter which is closest to the seat’s mid range capacity.

Differential pressure bar (x 100 = kPa)

Cold water capacity

Sizing example:

1. If the trap inlet pressure is 10 bar g - select E type pilot valve.

2. If the outlet pressure is 6 bar g then: 10 bar g (inlet pressure)

12

6

18

Recommended tightening torques

- 6 bar g (outlet pressure) means 4 bar g differential pressure exists.

3. If the trap is required to drain 25 000 kg/h then select either an

SP80E or SP100E with a 46 mm seat, as this is closest to

the mid-range capacity for a 46 mm seat. Although the capacity

is also within the lower range of a 54 mm seat, trap performance

16

15

14

8

11

10

21

would not be optimised.

Dimensions / weights (approximate) in mm and kg

Withdrawal distance

D

for bimetallic element

B

C

Withdrawal distance

E

A

ASME 150

DN80

350 210 132 150 100

43

48

DN100 400 210 132 150 100

52

60

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions

(IM-P624-01) supplied with the product.

How to order

Example: 1 off DN80 Spirax Sarco SP80E bimetallic steam trap with

46 mm seat and flanged EN 1092 PN40 end connections

20

for main valve assembly

Weight

Size

A

B

C

D

E

PN40

ASME 300

TI-P624-02 ST Issue 6

SP80 and SP100 Bimetallic Steam Traps

Spare parts

Item

8

22 A/F

10

36 A/F

14

17 A/F

16

29 A/F

20

19 A/F

or

N m

72 - 78

120 - 132

45 - 55

72 - 88

54 - 66

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