Desco AIRHAT Manuale utente

DESCO AIRHAT

CAT. NO. 61000

Overview

The DESCO Air Hat has been in production over 30 years, and has continually evolved to meet the

requirements of the Commercial Diving Industry. The Air Hat complies with all applicable industry and

government regulations including ADC, OSHA, U.S. Coast Guard, and CE. The Air Hat has a flow rate

capability in excess of that established by the U.S. Navy Divers Manual. Refer to the “Open Circuit System

Requirements” in the U.S. Navy Diving Manual for guidance in determining necessary airflow and overpressure

requirements for your application. Depth of the dive, hose diameter, air source, number of divers, and other

factors will effect the air delivery requirements. Therefore it is the responsibility of the contractor/diver to

determine the size of the air delivery system that will deliver a flow rate to adequately ventilate the Air Hat(s).

Policy Statement

When a new DESCO Air Hat leaves the factory it is as simple and safe as we can make it. It is designed to

operate safely and efficiently for many years without expensive or time-consuming maintenance. Its simplicity

however should not lull a diver into complacency. The Air Hat should receive good care and maintenance on a

regular basis to operate at peak efficiency. DESCO believes this design is the best balance of utility, durability,

and economy. DESCO Corporation cannot recommend, sanction, nor condone field modification of the Air Hat.

Modifying the Air Hat could result in unforeseen serious and life threatening consequences. Under no

circumstances should you remove wholly or in part any component, modifies components, or drill openings into

the Air Hat. Never circumvent the operation of any component of the Air Hat. Older Air Hats can be factory

retrofitted to bring them up to current standards. Double exhausts, double air inlet elbow (for bail-out system),

mounting blocks (for cameras and lights), or a penetrator elbow for a four wire communications plug can be

retrofitted, all or individually, by the factory.

If you have special requirements DESCO will attempt to accommodate your needs, provided they do not

compromise the safe operation of the Air Hat.

As DESCO strives to make diving equipment better, safer, and more user friendly we welcome comments and

suggestions from diving companies, regulatory agencies,and especially divers, whose safety is our ultimate

goal. Please feel free to contact us.

2007 DESCO Corporation

DESCO Corporation

240 N. Milwaukee Street

Milwaukee, Wisconsin 53202

Phone: 414-272-2371

FAX: 414-272-2373

E-Mail: diveq@execpc.com

www.divedesco.com

Instructions for use and maintenance of the DESCO Air Hat.

Contents: Page

Section 1. Instructions for use of the Air Hat.

1. How the neck seal works. 1

2. Equipment Usable with the Air Hat. 2

3. Assembly of Neck Dam or Dry Suit Collar to Air Hat. 2

4. To Remove or Replace the Flat Neck Ring Gasket. 2

5. General Maintenance. 2

6. Disassembly and Reassembly. 3

7. To Adjust Headpiece Insert for Head Size. 3

8. To Remove or Replace the Flat Neck Ring Gasket. 3

9. How to Choose the Proper Size of Neck Dam. 3

10. Airflow rate. 4

11. How to Minimize Air Intake Noise.4

12. Non-Return and Bail-out Non-Return Valves. 4

13. Communications. 5

14. Mounting Blocks. 5

15. Welding Shield. 5

Section 2. Maintenance Schedule for the DESCO Air Hat 6

Section 3. Inspection of Air Hat Parts 7

Section 4. Helmet Disassembly 9

Air Hat Exploded View 11

Air Hat Parts List 12

DESCO AIR HAT DIVING HELMET

Section 1. Instructions for use of the Air Hat.

How the neck seal works:

To achieve a watertight seal at the neck, the Air Hat makes use of a brass neck ring insert, a large O-ring, rubber

shims (if necessary), and either a neoprene/foam neck dam, or the stretchable neck yoke of a dry suit. When

these components are properly assembled and the insert is pressed and locked into the neck ring of the Air Hat,

two separate sealing points are provided against entry of water. The seals are interdependent and both must be

properly installed to provide maximum watertight integrity.

A cross-sectional view of the neck ring of the Air Hat with the neck ring insert assembly inserted may be

visualized thus:

Seal No. 1 is provided by the neckdam (or dry suit yoke) pressed between the neck ring insert and the flat neck

ring gasket.The neck ring gasket is attached to the helmet neck ring with adhesive.

Seal No. 2 is provided by the large O-ring, which is pressed at its top against the shoulder of the neck ring, and

at its bottom against the lower surface of the channel in the brass neck ring insert. As the neck dam or dry suit

yoke age the material may compress necessitating the use of a shim to take up the additional space.

These two seals are different both in operation and effect. The flat neck ring gasket used in Seal No.1 is an

open-cell or sponge like material, which resists, but will not wholly prevent the passage of water. An open cell

material is used since it maintains its shape under pressure, at depth. So long as a positive air pressure is

maintained in the Air Hat no water will enter. Should the pressure in the Air Hat become negative, as when the

air is turned off and the diver inhales, a little water may enter. This can, however,readily be blown out through

the neck dam simply by closing the exhaust valve so that air is forced out through the neck dam. Seal No.2,

when adjusted properly, provides a completely watertight seal.

Equipment Usable with the Air Hat:

When attachment to a dry suit is not desired, the Air Hat can be used with the special DESCO neck dam, which

provides a seal at the diver’s neck. The Air Hat can also be mated to a conventional commercial collar dress by

means of the DESCO Neoprene Breastplate. This attaches to the dress in the same manner as a copper

commercial breastplate but incorporates a stretchable cylindrical collar, which is attached to the neck ring insert

so as to make a seal with the Air Hat. Similar use can be made of any dry suit, which comes equipped with such

a collar.

Assembly of Neck Dam or Dry Suit Collar to Air Hat:

To attach the DESCO neck dam to the Air Hat hold the brass neck ring insert with its smaller diameter up.

Bring the neck dam up through this ring with the taped edge outside and the nylon inside. Fold the top edge of

the neck dam at the point nearest your body out over the top of the insert ring so that the taped edge fits into the

channel. Holding this point against your body do the same with the opposite side of the neck dam. Then using

your free hand fold the rest of the top edge of the neck dam outward and over the channel. The large O-ring is

then placed in the insert ring channel on top of the neck dam material. If because of the thinness of this material

the O-ring fits too loosely one or more rubber shims can be placed in the channel on top or below the neck dam

material, beneath the O-ring. When properly fitted the O-ring should rest firmly against the neck dam material

without being stretched.

The collar of the Neoprene Breastplate or dry suit can be assembled to the neck ring insert in the same fashion,

except that with the thinner collar material it will nearly always be necessary to use one or more rubber shims in

order to properly fit the O-ring. To insure a completely watertight seal care must be taken to see that the large

O-ring is correctly fitted so its outer circumference contacts completely around the inside surface of the Air Hat

neck ring when it is clamped in place.

Both the large O-ring and the mating sealing surface in the Air Hat have been given a light coat of lubricant at

the factory. It will be found that keeping these parts clean and lubricated will ease installing the neck ring insert

assembly into the Air Hat, and will prolong the life of the O-ring. Use a lubricant suitable for rubber O-rings

(petroleum free).

To Remove or Replace the Flat Neck Ring Gasket:

This gasket, as supplied with the Air Hat, is attached to the neck ring using a pressure sensitive, wet-back,

adhesive, or “Glop”. It can be removed by peeling the gasket gently off the neck ring surface. A new gasket is

installed using the same type of adhesive. Care should be taken to see that the gasket’s outer edge is in contact

with and adhered to the wall of the neck ring at all points, otherwise the gaskets effectiveness as a seal is

reduced.

General Maintenance:

The basic materials and construction of the DESCO Air Hat shell are the same as those used in conventional

diving gear, and it should generally be cared for in the same manner. If used in salt water it should be washed

off with fresh water after use, and dried with a clean cloth. The Air Hat shell has a coating of tin-plating on the

copper and brass. After considerable use, and if desired, the Air Hat can be disassembled and the shell can be

retinned. Painted Air Hats are coated with DuPont Imron Polyurethane Enamel Paint. This is a high durability

Automotive and Boat coating. This finish should be treated in the same manner as a cars finish. The window is

Acrylic and care should be taken to prevent scratching the surface. Clean the window with standard glass

cleaner and a soft clean cloth. To remove very fine scratches and some stains use a specially formulated plastic

cleaner like Novus Plastic Polish No.2. This polish will also work on fine abrasions in the paint on the shell.

Disassembly and Reassembly:

The Air Hat can be completely disassembled using a screwdriver and wrench.The headpiece assembly is held

in the Air Hat by a single #10-32 hex nut in the center of the top band. To remove the headpiece assembly

unscrew the hex nut as pull the headpiece assembly out by the side opposite the air control valve. Backing out

or removing the communications binding posts will ease removal.

To replace the headpiece assembly insert the side at the air control valve first making sure it is clear of the

copper tube. Rock the assembly in till the top band is over the retaining stud, then check the assembly is aligned

left and right by gauging the distance between the snout/shell seam and the front end of the side pads. Replace

and tighten the hex nut.

To remove the copper air distribution tube, first loosen the air control valve-retaining nut so that the valve will

rotate freely. Secondly, completely unscrew the compression nuts at both ends of the copper tube and rotate the

valve body counter clockwise until the tube drops free. If the tube is undamaged it can be reused. If replacement

is necessary the compression ferrules will also have to be replaced. A set of stainless steel ferrules are used on

the valve end, and a set of brass ferrules on the elbow end. The small ferrule goes on first, then the larger one

with the tapers on both pointing towards the end of the tube.

WARNING: Teflon tape should never be used on any part of the Air Hat. The possibility exists for pieces

of Teflon tape to enter the air delivery system and cause a blockage.

Removal and installation of the other components of the Air Hat are obvious from inspection and require no

special instructions.

To Adjust Headpiece Insert for Head Size:

Size adjustments to the headpiece assembly are made with the assembly removed from the Air Hat. Loosen the

two brass screws on the upper edge of the back plate at the rear of the assembly. The proper fit is achieved by

changing the circumference of the headpiece assembly, by sliding the back band in or out. The headpiece

should fit snugly on the diver’s head, as the liner will compress somewhat under pressure. When the correct fit

is achieved tighten the two screws and reinstall in the Air Hat.

To Replace Foam Neoprene Pads on Headband Assembly:

All new Air Hats use an improved Headpiece Assembly utilizing Polypropylene band, which are impervious to

corrosion, unlike the brass bands of earlier Air Hats. The side pads are attached to the side band with pressure

sensitive tape making replacement simpler. The top pad is held in place by the top band passing through a slot

in the top. To change the pads remove the liner from the Air Hat. It is held in by a # 10 – 32 hex nut in the

center of the top pad. Peel off the old side pad and discard. Unbolt one side of the top band and slide off the old

top pad. Slide the new top pad into place and rebolt the top band. Clean any oil, grease, dirt, or old adhesive

from the area where the new side pads will go. You can use Denatured Alcohol or Lacquer Thinner to clean the

area. Make sure all the solvents are completely gone before using the Air Hat again. Peel the paper backing

from the new side pad and press firmly into place. As you reinstall the liner into the Air Hat make sure the top

pad is centered on the retaining stud hole in the top band. Watch the side pads as you install the liner so they do

not roll as you press the liner into place. Check the liner to make sure it is centered in the Air Hat and replace

and tighten the hex nut.

How to Choose the Proper Size of Neck Dam:

Neck Dams are available in sizes 12 through 15. The appropriate size is approximately two sizes smaller than

the diver’s regular collar size. Thus, a diver who wears a size 16 collar should use a size 14 Neck Dam. Custom

sized Neck Dams are available upon request.

Airflow rate:

The air train of the DESCO Air hat will deliver a minimum of 12cfm at 100psi. Each new and rebuilt Air hat is

tested at the factory to assure this flow rate. Factors such hose diameter, delivery pressure, and condition of the

Lambswool will effect this flow rate. The 6000 PSI Stainless Steel Hoke Valve (p/n 2112G6Y) is capable of

delivering in excess of 50 SCFM at 100 PSI. It will reach approximately 75% of its maximum flow at one turn

of the valve handle. DESCO recommends a minimum of 6CFM at 100 PSI to properly ventilate the Air Hat.

This figure is based on U.S. Navy Diving Manual recommendationsfor open circuit diving, and DESCO testing

of the Air Hat. For light work setting the Air Control Valve between ¾ and one turn will provide sufficient air

flow while reducing air flow noise. If the workload becomes more strenuous the flow rate should be increased.

How to Minimize Air Intake Noise:

The air train of the DESCO Air Hat will deliver a minimum of 12 cfm at 100 psi. Each new and rebuilt Air Hat

is tested at the factory to assure this flow rate.Factors such as hose diameter, delivery pressure, and condition of

the Lambswool will affect this flow rate. The 6000-PSI Stainless Steel Hoke Valve (Hoke P/N 2112G6Y) is

capable of delivering in excess of 50 SCFM at 100 PSI. It will reach approximately 75% of maximum flow at

one turn of the valve handle. DESCO recommends a minimum airflow deliveryof 6cfm to properly ventilate

the Air Hat. This figure is based upon U.S. Navy Diving manual recommendations for the Mark 12 helmet,

which has a higher interior volume than the Air Hat. For light work setting the Air Control Valve between ¾

and one turn will provide sufficient airflow while reducing airflow noise. If the workload becomes more

strenuous the flow rate should be increased.

The Polyethylene air distributor directs air across the inside surface of the window and helps to prevent fogging.

As delivered from the factory, the interior of this air distributor is tightly packed full of Lambs wool, which

greatly reduces air intake noise. If a new air distributor is installed be sure new Lambs wool is inserted and

packed. Lambs wool is a coarse fiber material that does not compress to the point where it would choke airflow.

THERE IS NO SUBSITIUTE FOR LAMBSWOOL. Cotton and other similar materials will compress to a point

where it can impede airflow. Never substitute another material in the air distributor. Lambs wool is available in

Drug Stores, and the health products aisle in most department and grocery stores. The Lambs wool will also act

as a filter in the incoming air.

Particulate matter coming down the air system can accumulate in the Lambs wool gradually reducing the

airflow capability. Periodically inspect the Lambs wool and replace if it is dirty, shows signs of compacting, or

is contaminated with oil. If the air distributor shows signs of a color change this may indicate oil contamination

and it should be checked.

IMPORTANT NOTE:

The flat neck ring gasket can take a set, which will reduce its effectiveness as a seal, if the neck ring insert

assembly is left clamped in the Air Hat while it is not in use. When the Air Hat is not going to be used the neck

ring insert assembly should be separated from the Air Hat.

Non-Return and Bail-out Non-Return Valves:

The Non-Return valve on the Air Hat is standard 9/16”- 18 Oxygen thread. The Bail-out Non-Return (marked

with a letter ”B”) is drilled to accept a SCUBA whip from a Bail-out Bottle. A dust cap is provided on the Bail-

out Non-Return to protect the threads when not in use. The dust cap will provide some sealing but a complete

airtight seal is not guaranteed. The integrity of the Non-returns can be tested by applying air pressure to the Air

Hat with the control valve fully closed, then removing the air supply hose, and applying a solution of

dishwashing detergent and water to the inlets. No air should leak back through the Non-Returns. If a leak is

found the Non-Return disk may require replacement. This test method can be used on all connections in the air

supply train.

Communications:

This new DESCO Air Hat comes equipped with a new speaker cup which incorporates the binding posts for

standard two-wire communications, and a port for the installation of a Marsh marine style plug assembly. This

port comes plugged from the factory unless the Air Hat is ordered with the two or four wire communications

plug option. The customer can install the plug assembly at a later time with parts DESCO can provide.

Instructions for connection of a four-wire communications equipped Air Hat to customer’s umbilical.

If your new Air Hat was ordered with the Four Wire Communications Plug assembly, the helmet is shipped

without any wiring connections made to the speaker. This allows the customer to match the connections in the

Air Hat to the umbilical communications line. The customer should check which wires are paired to the

microphone and to the speaker on the umbilical communications line. The wire pair going to the speaker should

be shortened so they can reach the binding post ends without any strain on them. Use the ring terminals

provided and connect the wires to the binding posts. Make sure the insulatorsare installed on the terminals as a

short circuit could result if bare terminals contact the helmet or each other. The microphone wires can be cut to

length according to the placement of the microphone, which is determined according to the customer’s location

preference.

Instructions for installing the four-wire communications assembly as a retrofit.

Remove the port plug and clean and inspect the threads. Check the fit of the bulkhead fitting by inserting the

fitting as far as possible by hand. It should easily engage the threads and turn in about 1/3 of the way. Remove

the fitting and mix a small amount of fast set two-part epoxy. Apply the epoxy to the threads on the fitting and

insert into the port. Tighten the fitting to approximately 3/4 of the length of the threads. Allow the epoxy to set

per the manufacturers recommendations. Slip the compression nut and ferrules provided onto the plug pigtail.

The nut and ferrules should be placed so as to leave enough of the plug out to connect to the umbilical without

straining. Approximate the final location of the plug in relation to the bulkhead fitting and strip off the excess

cable sheathing, leaving enough to pass through the bulkhead fitting into the helmet. Insert the cable through

the bulkhead fitting. If the cable resists passing through apply soapy water or silicone spray to the cable. Also,

the sheathing of the cable can be worked towards the bare wire ends of the cable to reduce the diameter to aid in

installation. Tighten the compression nut. Follow the connection instructions above to complete the installation.

Bench test the installation before placing the Air Hat “in service”.

Mounting Blocks:

Two mounting blocks have been added to the snout of the Air Hat. They are supplied with a 3/8”-16 x ½” Brass

hex bolt and a rubber washer. These mounts are useful for light and camera placements. Mounting ancillary

items on the Air Hat will change the natural balance of the helmet and should be taken into account.

Welding Shield:

A Welding Shield accessory is available for the Air Hat from DESCO (Cat. No.61001W/S). It features a

standard 4 ½”x 5 ¼” square lens, and the frame covers the entire faceplate. It comes with 2 stainless steel

screws, which should be used in lieu of the brass window screws.

Section 2. Maintenance Schedule for the DESCO Air Hat

The DESCO Air Hat is simple to maintain and will provide reliable service with normal care and maintenance.

The following schedule will keep your DESCO Air Hat in top working order.

Before each dive:

1. Inspect all seals for nicks and tears. Replace as necessary.

2. Inspect the window for nicks, cracks, and deep scratches, which may weaken it. Pay special attention to

the screw holes.

3. Check the window screws for damage and tightness.

4. Check the air control valve for smooth operation. There should be some resistance to opening and

closing of the valve to prevent accidental readjustment during the dive.

5. Inspect the clamp and lock mechanism for damage and adjustment. . There should be some resistance to

opening and closing of the clamps and locks to prevent accidental opening during the dive.

6. Inspect the shell of the helmet for damage. Pay special attention to fittings and joints

7. Inspect the insert ring for damage. Also inspect the O-Ring, shim (if installed), and neck dam (if

installed).

8. Test the air train. With air connected check the operation of the non-return valves and air train. Close the

air control valve to pressurize the air train. Turn off the compressed air supply to the helmet. After one

minute open the air control valve. Air should be heard escaping from the air distributor. If no air is heard

check all fittings for leakage, repair and retest.

Periodic Maintenance:

Due to the varying conditions that DESCO Air Hats will encounter it is not possible to suggest a fixed

interval for periodic maintenance. The compressor, umbilical, environment, and usage will all effect how

often the Air Hat will need comprehensive maintenance. Particular attention should be paid to these items

when doing periodic maintenance. DESCO recommends that the periodic maintenance be done fairly often.

It is not possible to over maintain a DESCO Air Hat.

1. Check Lambswool in the Air Diffuser for discoloration and/or particulate matter. Replace if any

contamination is observed. ONLY USE Lambswool in the Air Diffuser.Use of any other material in

the Air Diffuser is not recommended.

2. Check the threading on the non-return valves for wear, dirt, or damage. When reassembling the Air

Hat never use Teflon Tape in any part of theair train. Loose pieces of tape can clog the

Lambswool or air control valve and result in loss of airflow.

3. Check all items, which are not easily accessible during the pre dive inspections.

Section 3. Inspection of Air Hat Parts

Insert Ring Assembly

O-ring: Wash the O-ring in soap and warm water to remove all dirt and contaminates. Do a careful inspection

for cuts, nicks, or gouges. Look closely at the glue seam for any evidence of potential failure.

Neckdam: When examining for holes pay particular attention to the area where the Neckdam wraps back

around to pass under the O-ring. Slightly stretching the material aids in locating holes. Check for wear and

stretching at the lower end of the Neckdam where it contacts with the diver’s neck.

Shim: Where the shim has been removed intact from the insert ring check for deterioration of the shim material.

Insert Ring: Carefully inspect the insert ring for dents and nicks. Remove any burrs with very fine sandpaper.

Check the ring for evidence of damage, which may have put it out of round.

Window Assembly

Window: Check the window carefully for cracks, scratches, or chips along the edges. Inspect the windows

gasket-sealing surface for dirt or gasket material adhering to it.

Gasket:Wash the gasket and window with soap and warm water. Carefully inspect the gasket for cuts,

cracking, or nicks, and check that the gasket is not gotten hard or soft.

Window Screws: Check for excessive corrosion or if the screw is bent. Look for cracking where the threads

meet the head.

Exhaust Valve Assembly

Single Exhaust Valve: Generally look over the unit for contamination or damage. Inspect the solder joint

where the adjuster cap meets the cover. Look for corrosion or cracking. Check the movement of the plunger in

the cover assembly and the action of the spring. Work the adjuster cap as a check for the condition of the cap

threads. Excessive play in the operation of the adjuster would warrant further disassembly down to the

component parts. Check the condition of the four cover retaining screws.

Double Exhaust Valve: Generally look over the unit for contamination or damage. Inspect the solder joint

where the adjuster cap meets the top section. Look for corrosion or cracking. Check the movement of the

plunger in the topsection assembly and the action of the spring. Inspect the threads on the top section adjuster

assembly. Work the adjuster cap as a check for the condition of the cap threads. Excessive play in the operation

of the adjuster would warrant further disassembly down to the component parts. Check the condition of the

plunger in the top section and the flapper guard in the mid section. Look for signs that the flapper valve(s) may

be sticking to them.

O-ring: Wash the O-ring on soap and warm water. Carefully inspect for cuts and nicks.

Flapper Valve(s): Check for wear and cracking in the material. Look for signs of physical deterioration of the

material such as hardening or softening. Look for signs that the flapper valve may be sticking to the plunger or

flapper guard.

Body Sections: Look for signs of damage or corrosion. Look for plating flaking or cracking. Check the flapper

valve sealing surface on the mid body for wear or damage. Check the threads in the mid body for dirt or

corrosion.

Clamp and Lock Assembly

Clamps: Inspect the clamps for corrosion, bends and cracks. Inspect the clamp holes for cracks and wear.

Locks: Inspect the locks for cracks at the solder joint. Look for bending or twisting in the tab. Check the hole

for cracking or wear.

Bolts & Nuts: Inspect the bolts for corrosion, wear, and bending. Look at the nuts for rounding off and thread

corrosion or wear. Try threading the nuts and bolts together to test the threads and the nylon locks on the nuts. If

the nuts will not self-lock they should be replaced. If the nylon washers appear to be flattened out replace them.

Binding Post Assemblies and Communications

Binding Posts: Check the solder joint for cracking. Test the clamp nut for operation. Check for bending. Older

binding posts were drilled for inserting the communications wire. If the binding post has this hole look for

cracking of the post next to the hole.

Bushings: Check the bushing for cracks of excessive compression.

Nuts:Check for rounding off and the general condition of the threads.

Speaker:Check the speaker for operation using a sound source. Inspect the speaker, wire and terminals for

wear, corrosion, or damage.

Speaker Cup: Check for wear and damage.

Headpiece Assembly

Band Assembly: Inspect for corrosion, missing parts, or loose hardware. Check for wear and cracking.

Insert: Check for wear and excessive hardening of the pads. Check the screw fasteners to make sure they are

still firmly attached to the pad.

Top & Side Pads: Inspect for wear, compression, or damage. Check that they are still firmly attached to the

band.

Air Train Assembly

Non-Return Valve(s): Inspect the body parts for corrosion, wear, or damage. Check the threads for condition.

Check for damage to the valve seat. Look for loose plating or corrosion. Check the spring for loss of strength or

corrosion.

Inside Elbow: Inspect the elbow for corrosion, wear, or damage.

Tube Inspect for corrosion, wear, or damage. Look for corrosion at the tube ends and on the ferrules where it

can interfere with the seals.

Air Control Valve Inspect for corrosion, wear, or damage. Look inside the valve openings for signs of foreign

material or contaminates. If the valve operation seemed loose before disassembly check the valve packing.

Check the valve stem for bending.

Air Diffuser Inspect for contamination or damage. Carefully remove the Lambswool into a plastic bag. Inspect

the Lambswool for contaminates and foreign material. Check the opening in the body for excessive wear. Look

at the body for oil or contaminate saturation.

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