Emerson Yarway Color-Port 4511N Instruções de instalação, operação e manutenção - Página 4

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YARWAY COLOR-PORT

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

5.2.1.7 Close the upper isolation valve and

open upper Welbloc

completely. Close lower Welbloc

gauge valve; then, slowly open the

drain valve. This will clear the tie-bar

and the gauge with boiler feed-water.

Slowly close the drain valve.

5.2.1.8 Open the upper isolation valve

completely. Re-open the drain valve

slowly until a substantial flow rate

is established through the gauge.

This will purge the upper gauge

connecting lines and the gauge with

a mixture of steam and feedwater.

Slowly close drain valves.

5.2.1.9 Open the upper and lower Welbloc

gauge valves and upper and lower

isolation valves. Check the gauge

for cleanliness. Repeat procedure if

necessary.

Completion of steps 6, 7, and 8, in order, give

progressively increased cleaning action. The

procedure may be stopped after step 6 or 7

by skipping to step 9 once the gauge is clean.

5.2.2

Gauges with Stuffing Box (B/S) Gauge

Valves and Isolation Valves (Figure 2B)

5.2.2.1 Open upper and lower isolation

valves if provided.

5.2.2.2 Close upper Stuffing Box (B/S)

Gauge Valve.

5.2.2.3 Open lower Stuffing Box (B/S) Gauge

Valve.

5.2.2.4 Slowly open drain valve(s). Water

level in gauge will lower as flow rate

through lower Stuffing Box (B/S)

Gauge Valve and connecting pipes

increases. This will clear sediment

from lower Stuffing Box (B/S) Gauge

Valve and connecting lines.

5.2.2.5 Close the drain valve. Water level in

gauge will again rise to top of gauge.

5.2.2.6 Close the lower Stuffing Box (B/S)

Gauge Valve and open the upper

Stuffing Box (B/S) Gauge Valve

completely. Re-open drain valve

slowly until a substantial flow rate is

established through the gauge.

5.2.2.7 Close the drain valve completely.

5.2.2.8 Open the lower Stuffing Box (B/S)

Gauge Valve. Check the gauge for

clearness. Repeat procedure if

necessary. Objects which cannot be

cleared by the above procedure will

require removal of the gauge from

the boiler connections.

WATER LEVEL GAUGES & WELBLOC

5.3 How to Service Color-Port

Servicing the Ports

gauge valve

Yarway recommends servicing the gauge

disconnected from the boiler piping and resting

in a horizontal position on a workbench. Gauges

serviced in this manner, where particular

attention is given to body groove and port

cleanliness, as well as sealing gasket positioning,

have performed better than those gauges

serviced while connected to the boiler piping.

If a gauge must be serviced while still installed

on the boiler, particular attention must be given

to:

1. The cleanliness and integrity of the body

grooves

2. The cleanliness and position of the

replacement port assemblies

3. The proper positioning of the sealing

gaskets in the body grooves during

tightening of the cover cap screws.

The following steps must be followed:

(Numbers in parentheses refer to items in

Figure 3B)

1. Isolate the gauge and remove pressure before

starting to disassemble the gauge. Follow

the procedure in section "Preparation for

washdown, servicing gauge auxiliaries or

gauge inspection".

2. Turn off the electrical power to the LED

illuminator. Carefully remove and set aside

the LED illuminator and viewing assembly.

Remove the gauge assembly from the boiler

connection lines.

3. Loosen and remove the cap screws (10). Use

a ⅜" size socket wrench.

4. Remove the viewing port assembly

completely. Figure 3B shows a cross

section. Retain the cover (2), spring cones

(4), washer (5), and retaining spring (8).

Discard the used cushion gasket (6) and the

used glass-mica-gasket-clip ring assembly

(7, 11, 9, and 3).

GAUGE VALVES

Water Gauge -