Spirax Sarco - Catalogo Agosto 2017

3.2.5

Steam

saturation

curve

Flowmetering

Gilflo and ILVA flowmeters

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 without notice.

TI-P337-46

MI Issue 3

Gilflo ILVA Flowmeter

DN250 and DN300

Description

The Gilflo ILVA flowmeter operates on the spring loaded variable

area principle and produces a differential pressure related to the

rate of flow. It can be used with most industrial fluids, gases and

both saturated and superheated steam. A general description of the

ILVA flowmetering system and its associated equipment is given in

a separate TI sheet.

Sizes and pipe connections

DN250 and DN300. For DN50, DN80, DN100, DN150 and

DN200 sizes see separate literature.

Suitable for fitting between the following flanges:

EN 1092 PN16, PN25 and PN40.

ASME B 16.5 Class 150, 300 and 600.

JIS 20.

KS 20.

The Gilflo ILVA flowmeter should be installed in pipework

manufactured to BS 1600 or ASME B 36.10 Schedule 40.

For different pipe standards/schedules, downstream spool pieces

with an equivalent internal diameter to BS 1600 or ASME B 36.10

Schedule 40 should be used. If this is not possible, please contact

Spirax Sarco Limited.

Materials

Part

Material

Body

Cast stainless steel S.316 (CF8M / 1.4408)

Internals

431 S29 / S303 / S304 / S316

Spring

Inconel X750

Pressure / temperature limits

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Performance

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The Gilflo ILVA is used in conjunction with linearising electronics

such as Spirax Sarco flow computers or M750 display unit.

Alternatively the output signal linearisation can be performed on an

EMS / BEMS or equivalent.

Accuracy when used with Spirax Sarco flow computers or M750:

±1% of measured value from 5% to 100% of maximum rated flow.

±0.1% FSD from 1% to 5% of maximum rated flow.

Repeatability better than 0.25%

Turndown: up to 100:1

Caution: The Scanner 2000 mass flow transmitters can be

configured at the factory to work with a single, specific Gilflo ILVA

flowmeter. For correct operation the configured transmitter

must always be installed with its allocated flowmeter. Labels on

the packaging give the serial numbers of the matched products.

Pressure drop

The maximum pressure drop across the Gilflo ILVA pipeline unit

is 498 m bar (200 ins water gauge) at maximum rated flow.

Flow capacity

To determine the capacity of the Gilflo ILVA for different fluids, it is

necessary to calculate the equivalent water flowrate Q (in l/min)

as described in Step 1, under the section 'sizing the Gilflo ILVA'

then selecting the appropriate size of flowmeter from the Table

under Step 2 overleaf.

How to order

Example: 1 off Spirax Sarco DN250 Gilflo ILVA flowmeter for

installation between EN 1092 PN40 flanges. The body material is

to be 316 stainless steel. The flow medium will be saturated

steam at 10 bar g and the maximum flow will be 28000 kg/h.

Pressure bar g

The product must not be used in this region.

Body design conditions

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

ASME 600

100 bar g @ 50°C

400°C @ 69 bar g

-29°C

PMO

Maximum operating pressure is dependant on the flange

specification

Minimum operating pressure

TMO Maximum operating temperature

Minimum operating temperature

0.6 bar g

400°C @ 69 bar g

-29°C

Note: For lower operating temperatures consult Spirax Sarco

Maximum viscosity

30 centipoise

DPMX Maximum differential pressure

498 m bar

Designed for a maximum cold hydraulic test pressure of 155 bar g