New York Codes, Rules and Regulations › Title 1 - DEPARTMENT OF AGRICULTURE AND MARKETS › Chapter I - Milk Control › Subchapter A - Dairy Products (Article 4, Agriculture and Markets Law) › Part 3 - Requirements For The Production, Processing And Distribution Of Grade A Condensed Milk, Dry Milk Products, Condensed Whey And Dry Whey Products › Sanitation Requirements for All Condensing Plants and Drying Plants Making Grade a Condensed Milk Products, Dry Milk Products, Condensed Whey and Dry Whey › Section 3.25 - High-temperature-short-time, (htst), continuous-flow pasteurization-item 16p(a)

Current through Register Vol. 46, No. 28, July 10, 2024
(a) Indicating
					 thermometers and recorder/controller instruments. All indicating thermometers
					 and recorder/controller instruments and devices used in connection with the
					 high-temperature-short-time, continuous-flow pasteurization of milk, milk
					 products, whey, condensed milk products and condensed whey shall comply with
					 the applicable specifications set forth in Appendix 9 of this Title.
(b) Automatic milk controller. Each
					 high-temperature-short-time, continuous-flow pasteurization system shall be
					 equipped with an automatic milk flow control of the diversion type which
					 complies with the following:
(1) Automatic
					 milk flow controls. The term automatic milk flow controls shall mean those
					 safety devices which control the flow of product in relation to the temperature
					 of the product, heating medium, pressure, vacuum or other auxiliary equipment.
					 Milk flow cntrols shall not be considered a part of the temperature control
					 equipment. Milk flow controls shall be of the flow-diversion type which
					 automatically cause the diversion of subtemperature product. Flow-diversion
					 devices shall return the subtemperature product to the raw product side of the
					 heating system continuously until proper pasteurization temperatures are
					 obtained, at which time the device shall restore forward product flow through
					 th pasteurizer.
(2) Flow-diversion
					 devices. Flow-diversion devices used in continuous pasteurizers shall comply
					 with the following:
(i) Forward flow of
					 subtemperature product due to the omission or looseness of the connecting clip
					 shall be prevented by making the valve and its actuating mechanism integral,
					 or, where there is a connecting device, by making it impossible to assemble the
					 valve and its actuating mechanism except in such manner that it will function
					 properly, or, where there is a connecting device which may be omitted or shaken
					 loose, by providing for pushing, instead of pulling, the valve to the diverted
					 position; or by providing that the pump will shut down when the product is
					 below the pasteruization temperature and the valve is not in the fully diverted
					 position, or by other satisfactory means.
(ii) A packing gland, used to prevent leakage
					 around the actuating stem, shall be constructed so as to prevent tightening of
					 the stem packing nut to such an extent as to prevent the valve from assuming
					 the fully diverted position.
(iii)
					 A leak escape shall be installed on the forward-flow side of the valve seat.
					 However, when back pressure is exerted on the forward-flow side of the valve
					 seat while the product flow is being diverted, the leak escape should lie
					 between two valve seats or between two portions of the same seat, one upstream
					 and the other downstream from the leak escape. The leak escape shall be
					 designed and installed to discharge all leakage to the outside or to the
					 constant-level tank through a line separate from the diversion line, provided
					 that, when leakage is discharged to the constant-level tank, a sight glass
					 shall be installed in the leak escape line to provide visual means of leak
					 detection.
(iv) The closure of the
					 forward-flow seat shall be sufficiently tight so that leakage past it will not
					 exceed the capacity of the leak escape device, as evidenced when the
					 forward-flow line is disconnected. The length of the connecting rod shall not
					 be adjustable by the user.
(v) The
					 flow-diversion device shall be designed and installed so that failure of the
					 primary motivating power shall automatically divert the flow of
					 product.
(vi) The flow-diversion
					 device shall be located downstream from the holder. The flow-control sensor
					 shall be located in the product line not more than 18 inches upstream from the
					 flow-control device.
(vii) The
					 pipeline from the diversion port of the flow-diversion device shall be
					 self-draining and shall be free of restrictions or valves, unless such
					 restrictions or valves are designed so that stoppage of the diversion line
					 cannot occur.
(viii) The pipeline
					 from the leak detector part of the flow-diversion device shall be self-draining
					 and shall be free of restrictions or valves, unless such restrictions or valves
					 are designed so that stoppage of the leak detector line cannot occur.
(3) Milk flow controller
					 instrumentation. Instrumentation of the milk flow controller shall comply with
					 the following:
(i) The thermal limit
					 controller shall be set and sealed so that forward flow of product cannot start
					 unless the termperature at the controller sensor is above the required
					 pasteurization temperature, as defined in section
					 3.2(k) 
					 of this Part, for the milk, milk product, whey, condensed whey and the process
					 used. The thermal unit controller shall be set and sealed so that forward flow
					 of product cannot continue during descending temperatures when the product
					 temperature is below the required pasteurization temperature. The thermal limit
					 controller shall be sealed by the regulatory agency after testing, and the seal
					 shall not be removed without immediately notifying the regulatory agency. The
					 system shall be designed so that no product can bypass the controller sensor.
					 The controller sensor shall not be removed from its proper position during the
					 pasteurization process. The cut-in and cut-out product temperatures, as shown
					 by the indicating thermometer, shall be determined at the beginning of each
					 day's operation and entered upon the recorder chart daily by the plant
					 operator.
(ii) Manual switches for
					 the control of pumps, homogenizers or other devices which produce flow through
					 the holder shall be wired so that the circuit is completed only when the
					 product is above the required pasteurization temperature, as defined in section
					 3.2(k) 
					 of this Part, for the milk, milk product, whey, condensed milk products and
					 condensed whey and the process used, or when the diversion device is in the
					 fully diverted position.
(4) Holding tube.
(i) Holders shall be designed to provide for
					 the holding of every particle of product for at least the time required in
					 section
					 3.2(k) 
					 of this Part for the milk, milk product, whey, condensed milk products and
					 condensed whey and the process used.
(ii) The holder shall be so designed that the
					 simultaneous temperature difference between the hottest and coldest product in
					 any cross-section of flow at any time during the holding period will not be
					 greater than one degree Fahrenheit (one-half degree Celsius). Tubular holders,
					 seven inches in diameter or smaller, which are free of fittings may satisfy
					 this requirement without test.
(iii) No device shall be permitted for
					 short-circuiting a portion of the holder to compensate for changes in rate of
					 product flow. Holding tubes shall be installed so that sections of pipe cannot
					 be left out (thus resulting in a shortened holding time).
(iv) The holding tube shall be arranged to
					 have a continuous upward slope in the direction of flow of not less than 0.25
					 inch per foot.
(v) Tube supports
					 shall be provided to maintain all parts of holding tubes in a fixed position,
					 free from any lateral or vertical movement.
(vi) The holder shall be designed so that no
					 portion between the inlet and the flow-control temperature sensor is
					 heated.
(5) Indicating
					 and recording thermometers.
(i) An indicating
					 thermometer shall be located as near as practicable to the temperature sensor
					 of the recorder/controller.
(ii)
					 The termperature shown by the recorder/controller shall be checked daily by the
					 plant operator against the temperature shown by the indicating thermometer.
					 Readings shall be recorded on the chart. The recorder/controller shall be
					 adjusted to read no higher than the indicating thermometer.
(iii) The recorder/controller charts shall
					 comply with the applicable provisions of section
					 3.27 
					 of this Part (Item 16p[C]).
(6) Flow-promoting devices.
(i) The pump, or pumps, and other equipment
					 which may produce flow through the holder shall be located upstream from the
					 holder, provided that pumps and other flow-promoting devices may be located
					 downstream from the holder if means are provided to eliminate negative pressure
					 between the holder and the inlet to such equipment. When vacuum equipment is
					 located downstream from the holder, an effective vacuum breaker and an
					 automatic means of preventing a negative pressure in the line between the
					 flow-diversion device and the vacuum chamber shall be acceptable.
(ii) The speed of pumps or other
					 flow-promoting devices governing the rate of flow through the holder shall be
					 controlled so as to insure the holding of every particle of product for at
					 least the time required, as defined in section
					 3.2(k) 
					 of this Part, for the product and the process used. The pump motor shall be
					 connected to the metering pump by a common drive shaft, or by gears and
					 pulleys, or by a variable-speed drive, with the gear box, the pulley box, or
					 the setting of the variable speed protected in such a manner that the holding
					 time cannot be shortened without detection by the regulatory agency. Pumps
					 shall be sealed after tests by the regulatory agency and such seal shall not be
					 broken without immediately notifying the regulatory agency. This provision
					 shall apply to all homogenizers used as timing pumps. Variable-speed drives
					 used in connection with the metering pump shall be constructed so that wearing
					 or stretching of the belt results in a slowdown, rather than a speedup, of the
					 pump. The metering or timing pump shall be of the positive displacement
					 type.
(iii) The holding time shall
					 be taken to mean the flow time of the fastest particle of product, at or above
					 the required pasteurization temperature, as defined in section
					 3.2(k) 
					 of this Part, for the product and the process used, throughout the holder
					 section. The holder section is that portion of the system that is outside of
					 the influence of the heating medium which slopes continuously upward in the
					 downstream direction and is located upstream from the flow-diversion device.
					 Tests for holding time shall be made when all equipment and devices are
					 operated and adjusted to provide for maximum flow. When a homogenizer is
					 located upstream from the holder, the holding time shall be determined with the
					 homogenizer in operation with no pressure on the homogenizer valves. Where
					 bypass lines are provided, either upstream or downstream from the metering
					 pump, the holding time shall be tested with both the regular and bypass line
					 open unless the bypass valve is so designed that both lines cannot be open at
					 the same time. The holding time shall be tested during both forward and
					 diverted flow. If necessary to lengthen the holding time during diverted flow,
					 an identifiable restriction may be placed in the vertical portion of the
					 diversion pipeline. When vacuum equipment is located downstream from the
					 holder, the holding time shall be tested with the metering pump operating at
					 maximum flow, and the vacuum equipment adjusted to provide for the maximum
					 vacuum. The holding time shall be tested in both forward and diverted flow by
					 the regulatory agency initially and quarterly thereafter. After any alteration
					 or replacement that may affect the holding time, and whenever the seal of the
					 speed setting has been broken, the holding time shall be tested by the
					 regulatory agency.