Collection of Images from Ari D. Palczewski and T. Reilly's Reviews

JLab UHV omponent leaning and

nitrogen blow off procedures and

development

Ari D. Palczewski

JLab

Ari D Palczewski, TTC topical  13Nov2014

Sacley France

Why this talk and questions for you to answer

•

Old UHV cleaning is not necessarily particle free, we wanted

ensure the all cleaning in lab would be “particle free” as

much as possible.

•

Since was have a new facility this was opportunity to revises

our procedures.

Questions -

•

I/Jlab want to know what your UHV cleaning procedure is?

Should be all be doing the same thing?

•

How do you develop procedures? Should TTC have a

procedures to make procedures?

•

As Hasan would want - what study should we do to qualify

procedure, # of tests?

T.Reilly, SRF Director's Review, 05JUN2014

Procedure development

•

Ask all Scientist and staff how they clean parts and

why, best practices. 

-

Felt like herding cats

Felt like herding cats

•

Review all previous UHV cleaning procedures, for

each type of material

•

Use same procedure for all components that can

fit into Ultrasonic tanks that will enter the clean

room even if overkill, cavities, bellows, assembly

parts ext.

•

Keep cleaning temperature below 130F because of

human factors

T.Reilly, SRF Director's Review, 05JUN2014

Stainless Steel Cleaning (example)

Stainless Steel Components and Fasteners

•

Components are completely 

disassembled

 to lowest level

•

Components (e.g. flanges) and fasteners are 

cleaned separately

•

Coated stainless is also cleaned separate from uncoated

Typical process

•

Visually inspect for excessive wear or damage

•

If the component(s) appears 

soiled or greasy

, perform the following:

–

Wipe all oil and marker off with acetone.

–

Measure 4 oz. of 

Micro90

 into a small container.

–

Use TX 1009B AlphaWipe to apply detergent directly to the part’s exterior.

Additional wipers, brushes or other means may be necessary to pre-clean

heavily soiled components.

–

Thoroughly rinse component with UPW.

–

Repeat as necessary

T.Reilly, SRF Director's Review, 05JUN2014

SS Component Cleaning (cont.)

Ultrasonic Cleaning  - for particle removal

•

All USC is performed in a laminar flow hood

•

Components are positioned to prevent their surfaces from touching each other

during the ultrasonic cleaning process

•

USC tank is filled with UPW up to overflow port.  

(full bath)

•

Flanges are loaded into wire mesh basket with sealing surfaces face up, away from

the basket whenever possible.  Basket is placed in USC ensuring components are

completely submerged

•

Add Micro90 detergent to the USC 

(2% concentration)

•

Turn on the USC heater and set the temperature to 

55°C (130°F) Turn on

ultrasonics and allow the component(s) to ultrasonically clean 

for 50 minutes.

NOTE: The UPW/detergent temperature shall be at least 55°C for a minimum

of 15 minutes

•

Turn off the USC heater and ultrasonics. 

Don a new pair 

of nitrile gloves and

inspect the component(s) for cleanliness.

•

If the parts do not appear to be clean, return the component(s) to the ultrasonic

bath and continue to USC until clean

T.Reilly, SRF Director's Review, 05JUN2014

Cleaning stations and hood

T.Reilly, SRF Director's Review, 05JUN2014

Pictorial view

T.Reilly, SRF Director's Review, 05JUN2014

Aluminum-Magnesium Gasket Cleaning

Cleaning

•

Cleaning is performed in a laminar flow hood

•

Don a new pair

 of nitrile gloves and appropriate safety glasses;

•

Gaskets are inspected visually for irregularities or damage (dings, nicks, scratches,

etc.).  Questionable gaskets are pulled and reported

•

Gasket is first wiped down with an acetone soaked TX 1009 Alphawipe

•

Gasket is next wiped down with an isopropyl alcohol soaked TX 1009 Alphawipe.

•

Gasket receives a final wipe down using an UPW soaked TX 1009 Alphawipe.

•

Gaskets are placed on new, dry TX 1009 Alphawipes within the laminar flow hood.

Bagging

•

Each gasket is bagged separately in its own bag

•

Bags are sealed on opposite end of bag with bag

•

Bagged gaskets are transported to the clean room pass-through

T.Reilly, SRF Director's Review, 05JUN2014

UHV Cleaning Key Points

•

Different materials are USC separately

•

Excessively soiled parts are first cleaned by hand rinsed

with UPW

•

All USC is done in a laminar flow hood

•

USC tanks are filled to the maximum level with UPW

•

Mesh baskets are used on small parts

•

Large Parts are placed such that edges don’t touch

•

USC in a 2% solution all types detergents

•

All USC are done at 55°C (130°F) for a total cycle time

of 50 minutes

–

Time at temperature needs to be at least 15 mins

T.Reilly, SRF Director's Review, 05JUN2014

UHV Cleaning Key Points (cont)

•

Copper parts are first soaked in closed container with a

20% solution of Citranox and UPW

–

Silicone-bronze uses 20% solution of Micro-90 and UPW

•

Copper and Silicone-bronze parts received two USC

(separately)

1.

Closed containers placed in USC bath

2.

In wire baskets with contents of containers emptied into

USC bath

•

All parts are bagged separately

–

Fasteners bagged by size and type

•

All Al-Mg gaskets are hand wiped three times;  IPA

followed by Acetone, final using UPW

T.Reilly, SRF Director's Review, 05JUN2014

Ionized Nitrogen Blow-Off Station

T.Reilly, SRF Director's Review, 05JUN2014

SOLAIR 3350 

: 0.3-10.0µm, 0.3µm @ 100 LPM

Ionized Nitrogen Criteria

Specification 1:

  Particle counts are to be zero at all

thresholds, except 0.3u which is allowed to be a maximum of

1 count every 5 seconds

–

Copper gaskets

–

All sub assembly flanges

–

All beam line hardware and fasteners

Specification 2:

  Particle counts are allowed to be 1 count per

second at the 1.0u threshold (pre-blow off before final blow

off)

–

N-type feed-throughs

–

Copper probe tips

–

All flange covers (metal and plastic)

–

Spring clamps

T.Reilly, SRF Director's Review, 05JUN2014

Ionized Nitrogen Procedure - preclean

•

The cleanroom parts cart is wiped down with cleanroom wipes and Isopropyl

•

Cleanroom wipes are spread out on the cart to place cleaned parts on

•

The parts and hardware are removed from their bags and 

spread out on a cleanroom

wipes 

and inventoried

•

The nitrogen cleaning table is cleaned by blowing off with ionized nitrogen criteria 1

•

If criteria 1 can not be satisfied after 2 minutes, the table is wiped clean with ultrapure

water and allowed to dry, then repeat blow down with ionized nitrogen

All nitrogen sources have a 0.02um point-of-use filter

T.Reilly, SRF Director's Review, 05JUN2014

Ionized Nitrogen Procedure – key points

•

Only flanges, gaskets, and first two

bolts/nuts/washer are blow off to spec 1

–

These bolts/nuts/washer are installed first and used to

hermitically seal the port

–

All other bolts/nuts/washers are not blown off and only

move to cavity for each port one at a time

–

If part is not clean in 2 minutes/5 minutes (large) part

must be re-cleaned (many more parts re-cleaned

compared to old protocol) – currently no values used

•

All components are prepared before any assembly can

begin

T.Reilly, SRF Director's Review, 05JUN2014

Questions for you to answer

Questions -

•

I/Jlab want to know what your UHV cleaning

procedure is? Should be all be doing the same

thing?

•

How do you develop procedures? Should TTC

have a procedures to make procedures?

•

As Hasan would want - what study should we

do to qualify procedure, # of tests?

T.Reilly, SRF Director's Review, 05JUN2014