Tweco 181i Fabricator User Manual download pdf (Page 36)

Fabricator 181i

INSTALLATION, OPERATION AND SETUP 3-6 Manual 0-5191

9. Slowly and carefully open the cylinder valve

(Figure 3-3) until the maximum pressure shows

on the high pressure gauge.

Art # A-09828

Figure 3-3: Open Cylinder Valve

10. On all cylinders, except acetylene, open the

valve completely to seal the valve packing. On

gaugeless regulators, the indicator will register

the cylinder contents open.

11. On acetylene cylinders, open the valve 3/4 of a

turn and no more than 1-1/2.

WARNING

Acetylene delivery pressure must not exceed

15 PSIG (103 kPa) or 30 PSIG (207 kPa).

Acetylene can dissociate (decompose with

explosive violence) above these pressure

limits.

CAUTION

Keep the cylinder valve wrench, if one is

required, on the cylinder valve to turn OFF

the cylinder quickly, if necessary.

12. Attach the desired downstream equipment.

3.07 Leak Testing the System

Leak test the system before putting into operation.

1. Be sure that there is a valve in the downstream

equipment to turn OFF the gas ﬂow.

2. With the cylinder valve open, adjust the regulator

to deliver the maximum required delivery

pressure.

3. Close the cylinder valve.

4. Turn the adjusting screw/knob counterclockwise

one turn.

a) If the high-pressure gauge reading drops,

there is a leak in the cylinder valve, inlet

ﬁtting, or high-pressure gauge.

b) If the low-pressure gauge drops, there is a

leak in the down stream equipment, hose,

hose ﬁtting, outlet ﬁtting or low-pressure

gauge. Check for leaks using an approved

leak detector solution.

c) If the high-pressure gauge drops and the

low-pressure gauge increases at the same

time, there is a leak in the regulator seat.

d) If the regulator requires service or repair,

take it to a qualiﬁed repair technician.

5. Once leak testing has been performed and there

are no leaks in the system, slowly open the

cylinder valve and proceed.

WARNING

If a leak has been detected anywhere in

the system, dis continue use and have

the system repaired. DO NOT use leaking

equipment. Do not attempt to repair a leaking

system while the system is under pressure.

3.08 When You Finish Using the

Regulator

1. Close the cylinder valve.

2. Open the valve on the downstream equipment.

This drains all pressure from the system.

3. Close the valve on the downstream equipment.

4. Turn the adjusting screw counterclockwise to

release the ten sion on the adjusting spring.

5. Check the gauges after a few minutes for

veriﬁcation that the cylinder valve is closed

completely.

3.09 Storage of the Regulator

When the regulator is not in use and has been removed

from the cylinder, it should be stored in an area where

it will be pro tected from dust, oil, and grease. The inlet

and outlet should be capped to protect against internal

contamination and prevent insects from nesting.

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Tweco 181i Fabricator User Manual Page 36

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