06-096 C.M.R. ch. 130, § 4 - Batch Vapor Cleaning Machines
This Section applies to batch vapor cleaning machines that process metal parts.
A. Batch vapor
cleaning machines shall be equipped with:
(1)
Either a fully enclosed design or a working and downtime mode cover that
completely covers the cleaning machine openings when in place, is free of
cracks, holes and other defects, and can be readily opened or closed without
disturbing the vapor zone. If the solvent cleaning machine opening is greater
than 10 square feet, the cover must be powered. If a lip exhaust is used, the
closed cover shall be below the level of the lip exhaust;
(2) Sides that result in a freeboard ratio
greater than or equal to 0.75;
(3)
A safety switch (thermostat and condenser flow switch) which shuts off the sump
heat if the coolant is not circulating;
(4) A vapor up control switch which shuts off
the spray pump if vapor is not present;
(5) An automated parts handling system which
moves the parts or parts baskets at a speed of 11 feet (3.4 meters) per minute
or less when the parts are entering or exiting the vapor zone. If the parts
basket or parts being cleaned occupy more than 50% of the solvent/air interface
area, the speed of the parts basket or parts shall not exceed 3 feet per
minute;
(6) A device that shuts off
the sump heat if the sump liquid solvent level drops to the sump heater
coils;
(7) A vapor level control
device that shuts off the sump heat if the vapor level in the vapor cleaning
machine rises above the height of the primary condenser;
(8) Each vapor cleaning machine shall have a
primary condenser;
(9) Each vapor
cleaning machine that uses a lip exhaust shall be designed and operated to
route all collected solvent vapors through a properly operated and maintained
carbon adsorber such that the concentration of organic solvent in the exhaust
does not exceed 25 parts per million; and
(10) A permanent, conspicuous label
summarizing the operating procedures found in Subsection 4D, below.
B. In addition to the requirements
of Subsection A., the operator of a batch vapor cleaning machine with a
solvent/air interface area of 13 square feet or less shall implement one of the
following options:
(1) A working mode cover,
freeboard ratio of 1.0 or greater, and a superheated vapor system;
(2) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point and a superheated vapor system
;
(3) A working mode cover and a
freeboard refrigeration device operated to ensure that the chilled air blanket
temperature is no greater than 30 percent of the solvent's boiling
point;
(4) Reduced room draft,
freeboard ratio of 1.0 or greater, and a superheated vapor system;
(5) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point and reduced room draft;
(6) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point and a freeboard ratio of 1.0 or
greater;
(7) A freeboard
refrigeration device operated to ensure that the chilled air blanket
temperature is no greater than 30 percent of the solvent's boiling point and
dwell. Dwell shall be not less than 35 percent of the dwell time determined for
the part or parts;
(8) Reduced room
draft, dwell and a freeboard ratio of 1.0 or greater. Dwell shall be not less
than 35 percent of the dwell time determined for the part or parts;
(9) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point and a carbon adsorber which reduces
solvent emissions in the exhaust to a level not to exceed 25 ppm at any time;
or
(10) A freeboard ratio of 1.0 or
greater, a superheated vapor system and a carbon adsorber which reduces solvent
emissions in the exhaust to a level not to exceed 25 ppm at any time.
C. In addition to the requirements
of Subsection A, the operator of a batch vapor cleaning machine with a
solvent/air interface area of greater than 13 square feet shall use one of the
following devices or strategies:
(1) A
freeboard refrigeration device operated to ensure that the chilled air blanket
temperature is no greater than 30 percent of the solvent's boiling point, a
freeboard ratio of 1.0 or greater, and a superheated vapor system;
(2) Dwell, a freeboard refrigeration device
operated to ensure that the chilled air blanket temperature is no greater than
30 percent of the solvent's boiling point, and reduced room draft. Dwell shall
be not less than 35 percent of the dwell time determined for the part or
parts;
(3) A working mode cover and
a freeboard refrigeration device operated to ensure that the chilled air
blanket temperature is no greater than 30 percent of the solvent's boiling
point and superheated vapor system;
(4) Reduced room draft, freeboard ratio of
1.0 or greater, and a superheated vapor system;
(5) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point, reduced room draft and superheated
vapor system;
(6) A freeboard
refrigeration device operated to ensure that the chilled air blanket
temperature is no greater than 30 percent of the solvent's boiling point,
reduced room draft and a freeboard ratio of 1.0 or greater; or
(7) A freeboard refrigeration device operated
to ensure that the chilled air blanket temperature is no greater than 30
percent of the solvent's boiling point, superheated vapor, and a carbon
adsorber which reduces solvent emissions in the exhaust to a level not to
exceed 25 ppm at any time.
D. Batch vapor cleaning machines shall be
operated in accordance with the following procedures:
(1) 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;
(2) Cleaned parts shall be drained at least
15 seconds or until dripping ceases, whichever is longer. Parts having cavities
or blind holes shall be tipped or rotated while the part is draining. A
superheated vapor system shall be an acceptable alternate technology;
(3) Parts baskets or parts shall not be
removed from the batch vapor cleaning machine until dripping has
ceased;
(4) Flushing or spraying of
parts using a flexible hose or other flushing device shall be performed within
the vapor zone of the batch vapor cleaning machine or within a Section of the
machine that is not exposed to the ambient air. The solvent spray shall be a
solid fluid stream, not an atomized or shower spray;
(5) When the cover is open, the batch vapor
cleaning machine shall not be exposed to drafts greater than 40 meters per
minute (132 feet per minute), as measured between 1 and 2 meters (3.3 and 6.6
feet) upwind and at the same elevation as the tank lip;
(6) Sponges, fabric, wood, leather, paper
products and other absorbent materials shall not be cleaned in the batch vapor
cleaning machine;
(7) Spills during
solvent transfer and use of the batch vapor cleaning machine shall be cleaned
up immediately. Wipe rags or other sorbent material shall be immediately stored
in covered containers for disposal or recycling;
(8) Work area fans shall be located and
positioned so that they do not blow across the opening of the batch vapor
cleaning machine;
(9) During
startup of the batch vapor cleaning machine the primary condenser shall be
turned on before the sump heater;
(10) During shutdown of the batch vapor
cleaning machine, the sump heater shall be turned off and the solvent vapor
layer allowed to collapse before the primary condenser is turned off;
(11) When solvent is added to or drained from
the batch vapor cleaning machine, the solvent shall be transferred using
threaded or other leakproof couplings and the end of the pipe in the solvent
sump shall be located beneath the liquid solvent surface;
(12) The working and downtime covers shall be
closed at all times except during parts entry and exit from the machine, during
maintenance of the machine when the solvent has been removed, and during
addition of solvent to the machine; and
(13) If a lip exhaust is used on the open top
vapor degreaser, the ventilation rate shall not exceed 20
m3/min/m2 (65
ft3/min/ft2) of degreaser
open area, unless a higher rate is necessary to meet OSHA
requirements.
Notes
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