Standardization of internal cleanliness measurement methods for steel drums

Standardization of internal cleanliness measurement methods for steel drums

Chairman of the Working Group of the Japan Steel Barrel Association

Yang Wenliang translation

Member of the Japan Steel Bar Association Working Group:

JFE Container Co., Ltd. Totofumi Fuga

D?(Daikan) Co., Ltd. Torao Sagawa

Japan Steel Bucket Co., Ltd. Takashi Okita

Kazuyuki Suzuki, Japan Steel Barrel Co., Ltd.

Kenji Mishina, Toho Sheet Products Co., Ltd.

Consumer demand

-- The chemical industry has the highest requirements for steel drums → Strongly requires the interior of the steel drum to be clean.

*Chemical products require that the surface of the raw materials should be cleaned.

* Especially the electronic materials, fine chemical products, precision equipment, etc. consisting of tree fingers require cleaner inside the barrel.

Recommendations of the ICDM standard

* At the ICDM International Conference, SEFA proposed to develop standards for the measurement of cleanliness inside steel drums.

* Based on this proposal, SSCI and JSDA began to study this proposal.

Changes in the use of new steel drums

Study on the pollution of fine particles inside steel drum

Composition of particulate pollutants

--Measurement methods:

Observe the filtered residue with a microscope

--ingredient:

(1) Coating fragments (carbon, titanium, magnesium, silicon)

(2) Dust (silicon, aluminum, calcium)

(3) Iron powder (iron)

(4) Particles (zinc, iron) falling off the closure

(5) Fiber (carbon)

(6) Toner (carbon)

Appearance of contaminated particles collected from inside the steel drum

- Examples of micro-slag on the filter -

- Examples of microscope photos -

The process of contaminating particles into steel drums

(1) Entering the seam at the time of phosphating

→iron (iron), dust (silicon, aluminum, calcium), fiber (carbon)

(2) The outer coating film enters from the barrel plug

→ Metal particles (zinc, iron) entering from the sealer, particles (carbon, titanium, magnesium, silicon) that are detached from the undercoat layer

(3) After delivery (the closure is opened by the consumer)

→ Particles (zinc, iron) entering from the sealer, dust (silicon, aluminum, calcium) falling from the top of the barrel, and fragments of the inner and outer coatings (carbon, titanium, magnesium, silicon)

―Process chart -

Steel drum internal cleanliness measurement method

JSDA

- There was a draft design for the instrument 13 years ago.

-- A new working group was established in June 2002.

(1) Study existing environmental conditions and amend a draft standard as proposed

(2) Conduct research using SEEA recommendations

Purpose: Revise a draft standard as proposed

JSDA measurement method

--cleaning method--

JSDA measurement method

- Pollution particle measurement method -

JSDA, SEFA and SSCI measurement methods

JSDA

SEFA

SSCI

(1) Steel drums of concern

Closed steel drum, 200 liters or more capacity

unspecified

(2) Cleanliness evaluation project

Weighing and counting of contaminated particles

Weight of contaminated particles

(3) Grading standards

NAS 1638 standard

unspecified

(4) Collection of contaminated particles

Inject 5 liters of isopropanol into the inside of the steel drum and collect the weighing washing solvent

Collecting contaminated particles (dust) with a vacuum filter (15 l/s)

(5) Pollution particle measurement

Calculate the contaminated micro-material in the washing solvent and weigh the filtered residue

Collect contaminated particles with a filter and weigh

SSCI measurement method

- Overview -

Comparison of JSDA, SEFA and SSCI measurement methods

JSDA

SEFA

Comparison of SSCIJSDA, SEFA and SSCI measurement methods

advantage

It is possible to obtain particle data of 5-15 micron size.

Comparative data can be obtained when filled with liquid.

Suitable for chemical suspension problems.

Simple operation can be placed outside the production line.

Most suitable for use in the production of standard drums.

Suitable for coating raw materials (to prevent paint filter clogging)

Disadvantage

Measurements must be made in the laboratory.

Only information on hard contaminated particles can be obtained.

Focus only on the external contaminated particles into the barrel.

It is difficult to measure closed steel drums (it is simpler for open steel drums).

Japan's steel drum cleanliness measurement example

Steel drum type

Manufacturer

Contaminants in liquid 200 liter steel drums

Number of particles: one per 100 ml

Particle weight

Particle size (micron)

Standard level

MG/barrel

Standard level

5-15

15-25

25-50

50-100

>100

Unlined steel drum

A

510

18

4

0

0

level 2

0.4

Level 100

434

20

5

0

0

Level 1

0.5

Level 100

B

113

12

5

0

0

Level 0

0.3

Level 100

433

42

14

1

0

Level 1

0.6

Level 100

C

459

8

0

0

0

Level 1

0.4

Level 100

529

12

3

0

0

level 2

0.7

Level 100

D

2777

57

11

0

0

level 4

1.3

Level 100

2554

33

7

0

0

level 4

1.6

Level 100

E

210

14

3

0

0

Level 0

0.2

Level 100

186

15

6

1

0

Level 0

0.6

Level 100

Lined steel drum

A

330

37

18

3

0

level 2

0.5

Level 100

128

17

8

1

0

Level 1

0.5

Level 100

B

394

61

25

3

0

level 2

1.1

Level 100

162

32

16

3

0

Level 1

0.6

Level 100

C

309

46

25

5

0

level 2

1.0

Level 100

285

39

20

3

0

level 2

0.8

Level 100

D

147

twenty four

14

4

0

level 2

0.6

Level 100

738

44

18

3

0

level 2

0.6

Level 100

E

126

twenty four

15

3

0

Level 1

0.3

Level 100

246

36

18

4

0

level 2

0.6

Level 100

JSDA example

1. Non-lined steel drum

Quantity: Standard level 0-4

Weight: 0.2-1.6 mg / barrel

Standard level 100

2. lining steel drum

Quantity: Standard level 1-2

Weight: 0.3-1.1 mg / barrel

Standard level 100

Measures to ensure the internal cleaning of steel drums in Japan

(1) Simplify the production process (avoid long-term inventory, if it is unavoidable, it must be protected against dust)

(2) Dust protection during product transportation

(3) Do not touch the chemical fiber gloves during the phosphating and sealing operation of the steel drum.

(4) Do not apply paint to the threaded part of the closure.

Use an external thread sealer.

Next plan

Drafting an ICDA standard

Promote the JSDA method among consumers

Standardization of measurement methods for drafting open steel drums and small and medium steel drums

Study methods for measuring other contaminants such as oils.