Flomec G Series Manual del usuario - Página 3

Navegue en línea o descargue pdf Manual del usuario para Instrumentos de medida Flomec G Series. Flomec G Series 16 páginas. Industrial and chemical models
También para Flomec G Series: Manual del usuario del producto (20 páginas), Manual del usuario del producto (20 páginas)

Imprimir página

This is extremely important when

sizing a turbine flowmeter where

the volume is measured per hour or

per day. For example, an application

where the total output is 500 barrels

per day, occurring in a 5 hour period;

the recommended turbine flowmeter

should be sized according to the

instantaneous flowrate:

(500 – 5) x 24 or 2,400 barrels per day

Thus, requiring an 1-½ inch turbine

flowmeter.

INSTALLATION

Turbine flowmeters are affected by

both upstream and downstream

process configurations. Turbine

flowmeters should always be installed

with a minimum of 10 pipe diameters

upstream and 5 pipe diameters

downstream. The only exception is

the placement of the pumps, valves,

etc., on the upstream end. When this

occurs, 20 diameters of straight pipe

should be used. The direction of flow is

indicated by the arrow on the turbine.

All turbine flowmeters are designed

to measure flow in only one direction.

Check the items below once the

turbine flowmeter is installed in the

process line. This will ensure a suc-

cessful start-up.

1. Before installing the magnetic sen-

sor, make sure that it is functioning

properly. This can be accomplished

by checking the ohm resistance.

Refer to Checking Magnetic Pickup

in the Troubleshooting section.

2. If a magnetic pickup enclosure is

used on a sanitary turbine, discard

the seal cap that is included with the

unit. If no enclosure is used, install

the magnetic pickup and slip the

seal cap over the magnetic pickup

and threads on the adapter.

NOTE: This is not applicable for units

that use a low profile adapter.

921977-01C

3. Check the interconnection cable

between the turbine flowmeter and

readout device. Refer to Checking

the Cable Assembly section.

4. Make sure that the new or correct

K-factor is entered into the readout

device.

Initial Start-Up

Turbine flowmeters can be installed

in the horizontal or vertical position.

When installing a turbine flowmeter

in the vertical position, it is important

that the direction of flow be up through

the turbine flowmeter.

A spool should be installed in place

of the turbine flowmeter during initial

start-up of a new process line. The

process line should be purged, thus

eliminating any solids contained in

the line. Once this is completed, the

spool can be removed and the turbine

flowmeter installed.

Whenever possible, use 20 straight

pipe diameters upstream and down-

stream of the turbine flowmeter. The

length of straight pipe upstream and

downstream of the turbine flowmeter

can be reduced with the use of flow

straighteners or straightening vanes.

A minimum of 10 straight pipe diam-

eters upstream and 5 downstream

are required.

NOTE: Control valves should always

be installed downstream of the

turbine flowmeter.

The turbine flowmeter should be

installed in a location where the pro-

cess line will remain full of liquid at all

times. Otherwise, when the process

line becomes empty and a valve is

opened, the high velocity fluid hitting

the turbine flowmeter rotor can cause

severe damage.

When there is entrained air in the

process line, an air eliminator should

be used. This entrained air causes

air pockets and these air pockets