Flowmetering

Target flowmeters

3.3.9

TFA size

Flange type

EN 1092

ASME

ASME

JIS 20

PN16

150

300

KS 20

PN25

PN40

DN25 1"

1930283

1930283 1930283

DN32 11⁄4"

1930283

1930283 1930283

DN40 11⁄2" 1930283 1930483

DN50 2"

1930283

1930283

1930583

Software copyright

Certain computer programs contained in this product [or device] were developed by Spirax-Sarco Limited ('the Work(s)').

Copyright © Spirax-Sarco Limited 2016

All Rights Reserved

Spirax-Sarco Limited grants the legal user of this product (or device) the right to use the Work(s) solely within the scope

of the legitimate operation of the product (or device). No other right is granted under this licence. In particular and without

prejudice to the generality of the foregoing, the Work(s) may not be used, sold, licensed, transferred, copied or reproduced

in whole or in part or in any manner or form other than as expressly granted here without the prior written consent of

Spirax-Sarco Limited.

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions (IM-P193-02 and IM-P193-03) supplied with the product.

The following main points are given for guidance only:

1. The TFA flowmeter should be mounted with the 'concave' side of the target facing upstream, with a minimum of 6 straight pipe diameters

upstream and 3 downstream. No valves, fittings or cross sectional changes are permitted within these pipe lengths. Where an increase

in nominal pipe diameter is required, upstream of the flowmeter, the length of straight pipe should be increased to 12 diameters.

Similarly, where a flowmeter is installed downstream of two 90° bends in two planes, a pressure reducing valveor a partly open valve,

12 upstream pipe diameters should be allowed.

2. It is important that the internal upstream and downstream diameters of pipe are smooth. Ideally seamless pipes should be used and

there should be no intrusive weld beads on the internal diameter.

3. The TFA flowmeter must be installed concentrically in the line using the centralising bush kit (ordered separately). If this is not done,

flow measurement errors may occur.

4. The TFA flowmeter can be installed in any orientation up to a line pressure of 7 bar g (102 psi g).

5. As with all steam flowmetering installations, good basic steam engineering practices should be followed:

-

Correct line drainage through adequate trapping.

-

Good alignment and support of associated pipework.

-

Line size changes achieved by the use of eccentric reducers.

-

Do not lag (insulate) the TFA body or the mating flanges.

Centralising bush kits

How to order

Example: 1 off Spirax Sarco DN25 TFA flowmeter supplied with centralising bush kit 1930283 suitable for mounting between

EN 1092 PN40 flanges for use on saturated steam at 10 bar g - Maximum flow 349 kg/h.

Note: For details of the optional remote display see the relevant Spirax Sarco M750 literature.

Page 4 of 4

TI-P193-01 MI Issue 4

TFA Flowmeter for Saturated Steam Service