Aqua Lung SEA MK Troubleshooting Guide download pdf (Page 6)

SEA MK Technical Maintenance Manual

Medium (Over-Bottom) Pressure Test

1. With the valve closed, purge the second stage to depres-

surize the system. While securely holding the second

stage inlet tting (51) with a thin 3/4" open-end wrench,

apply an 11/16" open-end wrench to the female tting

of the MP hose. Turn the hose tting counterclockwise to

loosen and remove the hose from the second stage.

2. Connect the medium pressure test gauge (PN

111610) to the female tting of the MP hose, and tighten

the hose tting by hand until nger tight.

3. While holding the MP test gauge positioned so that it is

facing away from you, pressurize the system by slowly

turning the SEA MK valve handle counterclockwise.

Check the SEA MK pin indicator or dial gauge to ensure

that it indicates the cylinder is lled with at least 2,700

psi.

4. Note the medium (over-bottom) pressure indicated by the

test gauge, and briey open and shut the bleed

valve of the test gauge to ensure that lockup is achieved

without “creeping” or uctuating back and forth.

5. If the medium pressure “creeps” up or otherwise

uctuates after cycling the regulator, wait for it to stabilize

(if possible) before noting the nal medium pressure.

NOTE: Correct medium pressure for the SEA MK is 135

(±20) psi, with an inlet pressure between 2,500 - 3,000 psi.

6. Partially open the bleed valve of the MP test gauge to

empty the SEA MK cylinder very slowly. DO NOT fully

open the test gauge bleed valve to empty the cylinder, as

this may cause condensation of moisture to form inside

the rst stage and hose, as well as the cylinder itself. If

the cylinder or valve becomes cold to the touch while

performing this step, the air has been relieved too rapidly.

WARNING: Failure to completely empty the SEA MK of air

prior to performing any disassembly may cause the sudden

separation of components or ejection of parts, and may

result in serious personal injury.

Initial Inspection Procedure

External Inspection

1. When possible, inspect the lter of the ll adapter for

any signs that contaminants, such as moisture or

particulate matter, may have entered the system.

2. Visually inspect the MP hose along its length for any

signs of deterioration or damage, such as blistering,

abrasion, or corrosion of the ttings.

3. Slowly pressurize the system by turning the on-off

handwheel counterclockwise

4. Examine the pressure indicator (pin or dial) to deter-

mine whether the pin is within the full range or dial is

in the green, indicating that the SEA MK cylinder is

full.

NOTE: If the pin indicator or dial indicator does not indicate

that the cylinder is completely full, it will be necessary to

perform the lling procedure outlined in the SEA MK Owner’s

Manual before proceeding further.

WARNING: Only use the SEA MK with normal, atmospheric,

compressed air (21% oxygen and 79% nitrogen by volume).

DO NOT attempt to ll with pure oxygen, or enriched air

which contains more than 23.5% oxygen. Failure to observe

this warning may result in serious injury or death due to re

and explosion, or the serious deterioration and failure of the

equipment.

Immersion / Leak Test

1. After ensuring that the system is pressurized and the cyl-

inder is full, listen for any obvious signs of leakage from

the system, including free ow from the second stage.

CAUTION: If a second stage leak is detected, carefully

perform the medium pressure test. Use caution and avoid

over pressurizing the MP test gauge. Performing this test

may cause damage to the test gauge, and possibly result

in serious personal injury.

2. If there are no detectable leaks, immerse the entire sys-

tem in fresh water. Check for any bubble streams to

locate the source of any leakage.

3. Note the source of any leakage found and refer to Table

2: Troubleshooting, p. 18 & 19 to determine its possible

cause.

4. Close the valve and depress the second stage purge

to completely depressurize the system. Wait at least ve

minutes, and depress the second stage purge to deter-

mine whether any air pressure has built up inside the

MP hose and second stage valve.

NOTE: A buildup of pressure is caused by either a bad

valve seat (20) or damaged sealing surface inside the

body (36). If a buildup of air pressure occurs, check both

items. Replace the valve seat rst. If the problem still

occurs, replace the body.

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Aqua Lung SEA MK Troubleshooting Guide Page 6

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