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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 20. ENVIRONMENT |
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Chapter 20-7. AIR QUALITY - VOLATILE ORGANIC COMPOUNDS AND HAZARDOUS AIR POLLUTANTS |
Section 20-767. SOLVENT CLEANING – AIRLESS AND AIR-TIGHT CLEANING
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767.1 This section applies to airless cleaning machines and air-tight cleaning machines that process metal parts.
767.2The operator of each machine shall maintain a log of solvent additions and deletions for each machine that includes the weight of solvent contained in activated carbon or other absorbent materials used to control emissions from the cleaning machine;
767.3The operator of each machine shall demonstrate that the emissions from each machine, on a three (3) month rolling average, are equal to or less than the allowable limit determined by the use of Table I in this section or the following equation if the volume of the cleaning machine exceeds two and ninety-five one hundredths cubic meters (2.95 m.3):
EL = 330 (vol.)0.6
where:
EL = the three-month rolling average monthly emission limit (kilograms/month);
vol. = the cleaning capacity of machine (cubic meters);
Table I. Emission Limits for Cleaning Machines without a Solvent/Air Interface
Cleaning Capacity
(m.3)
3-Month rolling average monthly emission limit (kilograms/month)
Cleaning Capacity
(m.3)
3-Month rolling average monthly emission limit (kilograms/month)
Cleaning Capacity
(m.3)
3-Month rolling average monthly emission limit (kilograms/month)
0.00
0
1.00
330
2.00
500
0.05
55
1.05
340
2.05
508
0.10
83
1.10
349
2.10
515
0.15
106
1.15
359
2.15
522
0.20
126
1.20
368
2.20
530
0.25
144
1.25
377
2.25
537
0.30
160
1.30
386
2.30
544
0.35
176
1.35
395
2.35
551
0.40
190
1.40
404
2.40
558
0.45
204
1.45
412
2.45
565
0.50
218
1.50
421
2.50
572
0.55
231
1.55
429
2.55
579
0.60
243
1.60
438
2.60
585
0.65
255
1.65
446
2.65
592
0.70
266
1.70
454
2.70
599
0.75
278
1.75
462
2.75
605
0.80
289
1.80
470
2.80
612
0.85
299
1.85
477
2.85
619
0.90
310
1.90
485
2.90
625
0.95
320
1.95
493
2.95
632
767.4 The operator of each machine shall operate the machine in conformance
with the manufacturer’s instructions and good air pollution control practices;
767.5 The operator of each machine equipped with a solvent adsorber shall
measure and record the concentration of solvent in the exhaust of the carbon adsorber weekly with a colorimetric detector tube designed to measure a concentration of one hundred parts per million (100 ppm) by volume of solvent to air at an accuracy of plus or minus twenty-five parts per million (25 ppm) by volume. This test shall be conducted while the solvent cleaning machine is in the working mode and is venting to the adsorber;
767.6 The operator of each machine equipped with a solvent adsorber shall maintain and operate the machine and adsorber system so that emissions from the adsorber exhaust do not exceed one hundred parts per million (100 ppm) by volume, measured while the solvent cleaning machine is in the working mode and is venting to the adsorber;
767.7 The machine shall be equipped with a permanent, conspicuous label summarizing the operating requirements in § 767.8;
767.8 Airless cleaning machines and air-tight cleaning machines shall be operated in accordance with the following procedures:
(a) Waste solvent, still bottoms, and sump bottoms shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief but does not allow liquid solvent to drain from the container;
(b) Parts shall be oriented so that the solvent drains freely from the parts:
(1) Cleaned parts shall be drained at least fifteen (15) seconds or until dripping ceases, whichever is longer; and
(2) Parts having cavities or blind holes shall be tipped or rotated while the part is draining;
(c) Parts baskets or parts shall not be removed from the in-line vapor cleaning machine until dripping has ceased;
(d) Sponges, fabric, wood, leather, paper products and other absorbent materials shall not be cleaned in the airless cleaning machines and air-tight cleaning machines;
(e) Spills during solvent transfer and use of the airless cleaning machines and air-tight cleaning machines shall be cleaned up immediately, and the wipe rags or other absorbent materials shall be immediately stored in covered containers for disposal or recycling;
(f) Work area fans shall be located and positioned so that they do not blow across the airless cleaning machine and air-tight cleaning machine;
(g) Spraying operations shall be done in the vapor zone or within a section of the machine that is not exposed to the ambient air; and
(h) Solvents shall be transferred using threaded or other leak proof couplings and the end of the pipe in the solvent sump shall be located beneath the liquid solvent surface when solvent is added to or drained from the airless cleaning machine and air-tight cleaning machine.