Rule 777c. Section P-1505.8.6 of the code is amended to read as follows:

P-1505.8.6 Beverage dispensers:

The water supply connection to carbonated beverage dispensers shall consist of a double check valve with an intermediate atmospheric vent that is in compliance with the provisions of ASSE 1012-72 listed in appendix A. The ASSE 1012-72 device and the piping downstream of this device shall not be affected by C02 gas. The device shall be immediately preceded by a strainer with a 100-mesh screen. The ASSE 1012-72 standard of the American society of sanitary engineering, which is adopted in these rules by reference, may be purchased from the American Society of Sanitary Engineering, P.O. Box 9712, Bay Village, Ohio 44140, at a cost as of the time of adoption of these rules of $12.00 each, or from the Michigan Department of Labor, Bureau of Construction Codes, State Secondary Complex, 7150 Harris Drive, P.O. Box 30255, Lansing, Michigan 48909, at a cost as of the time of adoption of these rules of $12.00 each, plus mailing costs. These standards may be inspected at the Lansing office of the Michigan department of labor.

R 408.30777d Installation of devices.

Rule 777db Sections P-1505.9 and P-1505. 11 of the code are amended to read as follows:

P-1505.9. Installation of devices.

(1) Vacuum breakers. A vacuum breaker shall be installed with the critical level not less than 6 inches above the flood level or rim of the fixture the breaker serves and shall be installed on the discharge side of the last control valve to the fixture. A shutoff valve or faucet shall not be installed downstream from the vacuum breaker. For closed equipment and vessels, such as pressure sterilizers, the top of the equipment or vessel shall be treated as the flood level rim. A check valve shall be installed in the discharge side of the vacuum breaker on pressure vessels.

(2) Reduced pressure zone backflow preventer. A reduced pressure zone type backflow preventer. may be installed subject to full static line pressure.

(3) Pressure-type vacuum breaker. Pressure-type vacuum breakers may be installed so that they are continually subject to static line pressure, that is, a valve may be installed downstream from the vacuum breakers. Pressure-type vacuum breakers shall be installed not less than 12 inches above the equipment or the piping served.

(4) Devices of all types. A backflow and back-siphonage-preventing device shall be accessibly located, preferably in the same room with the fixture the device serves. The installation of a device in a utility or service space is also permitted if the device is readily accessible.

P-1505.11. Protection of potable water outlets. A potable water system shall be protected against backflow and back-siphonage by providing either of the following:

(a) An air gap, as specified in P-1505.11.1, between the potable water outlet and the flood level rim of the fixture it supplies or between the potable water outlet and any other source of contamination.

(b) A backflow prevention device which is approved as provided in P1505.8 and which is in compliance with the provisions of P-1505.11.1, P1505.11.2, or P-1505.11.3.

Distilled or deionized water systems shall be protected against backflow and back-siphonage the same as any other potable water supply. A distilled or deionized water system shall not be considered a secondary water system.

R 408.30777e Connections to the potable water system.

Rule ille. Section P-1505.12 of the code is amended to read as follows:

P-150&. 12. Connections to the potable water system. The connections made within a potable water system shall conform to sections P-1505.12.~ to P-1505.12.11.

R 408.30778 Connections to boilers.

Rule 778. Section P-1505.12.1 of the code is amended to read as follows:

P-1505.12.1. Connections to boilers. Potable water connections to high pressure boilers and boiler feed water systems in which boiler water conditioning chemicals are introduced shall be made through an air gap or provided with an approved reduced pressure zone backflow preventer located in the potable water line where such chemicals are

introduced.

Low pressure boilers not subject to chemical treatment shall be equipped with a double check valve assembly or other approved device in the water supply line to the boiler.

For the purpose of this section, a high pressure boiler is one whose pressure relief valve is set for more than 15 p.s.i.g. if steam, or more than 30 p.s.i.g. if a water boiler.

Chemical treatment shall not be added to a previously untreated boiler feed water system without first securing a plumbing permit and providing protection to the water supply by the installation of an air gap or reduced pressure zone backflow preventer in the water supply to the boiler.

R 408.30778a Connections to heat exchangers.

Rule 778a. Section P-1505.12.2 of the code is amended to read as follows:

P-1505.12.2. Connections to heat exchangers. Heat exchangers used to heat or cool potable water shall be designed to protect the potable water system against contamination from the heat transfer fluid in accordance with the following criteria:

Heat exchangers shall be divided into 3 basic types:

Type Kind of Separation

NW None

SW *Single wall 1

DWP **Double wall

~ Based on review of pertinent operational data, additional design criteria may be required for specific installations by the plumbing official.

**Double~wall (2-wall): This shall mean 2 separate walls with a leak path (void) between the walls that is open and drainable to the atmosphere so as to provide tell-tale evidence of leakage in either wall.

Installations consisting of tubing or a plate coil wrapped around, and bonded to, a tank will be considered as having double-wall (2-wall) separation if the distance between the bonded areas on the tubing or plate coils is equal to, or greater than, the width of the bonded area.

Double heat exchangers (3-stage heat exchangers) with potable intermediate transfer fluid vented to the atmosphere shall be considered equivalent to double-wall separation.

Heat transfer fluids shall be divided into 3 basic classes:

Class Heat Transfer

Class I Potable

Class II *Essentially non-toxic

Class III **Essentially toxic

*Class II heat transfer fluids are typically materials with a Gosselin toxicity rating of ~, which are neither mutagenic, teratogenic, nor carcinogenic to humans or laboratory animals, and which are known not to bioaccumulate in humans or laboratory animals. Examples of fluids which typically might fall in Class II are: propylene glycol, mineral oil (USP), glycerine (USP), polydimethysiloxane, freon, FDA approved boiler water additives for steam boilers.

**Class III heat transfer fluids are typically materials with a Gosselin rating of 2 or 3. Examples of fluids which might fall in Class III are:

ethylene glycol, hydrocarbon oils, ammonia refrigerants, hydrazine.

The class of heat transfer fluid that may be used with various types of heat exchangers is as follows:

I NW, SW, DWP

II SW, DWP

III DWP

Materials which have Gosselin toxicity ratings greater than 3 shall not be used. All additives, corrosion inhibitors, and residuals shall also be considered with the major component when classifying a fluid.

The properties of all heat transfer fluids are to be determined by an independent testing laboratory. The final classification, based on the review of pertinent test data, shall be established by the Michigan department of public health.

Prior to approval and acceptance of the system, a notarized statement listing the class and name of the heat transfer fluid introduced into the system shall be provided by the owner, owner representative, or installing contractor, to the plumbing official.

A permanently affixed label shall be provided at a prominent place in the system, stating:

Heat exchanger type (fill in)

Heat transfer fluid class (fill in)

Warning: Do not add any other fluid to this system or

change heat transfer fluid to a higher class. Unauthorized alterations to this system could jeopardize water quality

and pose a serious public health threat.

The above information and warning shall also be clearly noted in the owner's operating manual.

Section P-108.4 shall apply to alternate or non-listed materials not covered in this code.

R 408.30778b Connections to automatic fire sprinkler systems and connections subject to back pressure.

Rule 778b. Sections P-1505.12.3 and P-1505.12.4 of the code are amended, and sections P-1505.12.3.1, P-1505.12.3.2, and P-1505.12.3.3 are added, to read as follows:

P-1505.12.3. Connections to fire protection systems: Except as required by section P-1505.12.3.1, P-1505.12.3.2 or P-1505.12.3.3, the

potable water supply to a fire protection system shall be equipped with a check valve.

P-1505.12.3.1. Aboveground storage: A double check valve assembly or double detector check valve assembly that is in compliance with the provisions of ASSE 1015-88 listed in appendix A shall be installed on the supply pipe from the public water supply main to all fire protection systems that are also connected to elevated storage tanks or aboveground covered reservoirs or tanks that contain potable water. The ASSE 1015-88 standard of the American society of sanitary engineering, which is adopted in these rules by reference, may be purchased from the American Society of Sanitary Engineering, P.O. Box 9712, Bay Village, Ohio 44140, at a cost as of the time of adoption of these rules of $12.00 each, or from the Michigan Department of Labor, Bureau of Construction Codes, State Secondary Complex, 7150 Harris Drive, P.O. Box 30255, Lansing, Michigan 48909, at a cost as of the time of adoption of these rules of $12.00 each, plus mailing costs. These standards may be inspected at the Lansing office of the Michigan department of labor.

P-1505.12.3.2. Exposed or underground storage: A reduced-pressure principle backflow preventer that is in compliance with the provisions of ASSE 1013-71 listed in appendix A shall be installed on the supply pipe from the public water supply main to all fire protection systems that are also connected to exposed or covered reservoirs, rivers, or ponds, or those water sources intended for fire department use to supply the fire protection system. The ASSE 1013-71 standard of the American society of sanitary engineering, which is adopted in these rules by reference, may be purchased from the American Society of Sanitary Engineering, P.O. Box 9712, Bay Village, Ohio 44140, at a cost as of the time of adoption of these rules of $12.00 each, or from the Michigan Department of Labor., Bureau Of Construction Codes, State Secondary Complex, 7150 Harris Drive, P.O.Box 30255, Lansing, Michigan 48909, at a cost as of the time of adoption of these rules of $12.00 each, plus mailing costs. These standards may be inspected at the Lansing office of the Michigan department of labor.

P-1505.12.3.3. Antifreeze solution: A reduced-pressure principle backflow preventer that is in compliance with the provisions of ASSE 1013-71 listed in appendix A shall be installed on the supply pipe from the public water supply main to all fire protection systems with antifreeze or other solutions. If the antifreeze or other solution is only in a portion of the system, the reduced-pressure principle backflow preventer shall be installed on that portion if the preventer is not installed on the main supply.

P-1505.12.4. Connections subject to back pressure. Where a potable water connection is made to a line, fixture, tank, vat, pump, or other equipment with a hazard of backflow or back-siphonage and the water connection is subject to back pressure, the connection shall be made by means of an air gap with a surge' tank and pump. Where this method is not feasible, the use of a reduced-pressure zone backflow preventer is permitted if the system design is submitted to the administrative authority for approval before installation.

R 408.30778c Protection required for water supplies to closed recirculating systems used for heating, cooling, or combination systems.

Rule 778c. Section P-1505.12.5 of the code is amended to read as follows:

P-1505.12.5. Protection required for water supplies to closed recirculating systems used for heating, cooling, or combination systems. Potable water piping connected to a closed recirculating system used for heating, cooling, or combination systems shall be protected against backflow by either an air gap and surge tank or by a backflow preventer of the reduced pressure zone type, except when additives are not introduced into the system. If the recirculated water is only potable water without any additives, a double check valve assembly may be substituted for the protection specified in this section. However, the owner of the building in which the system is located shall submit an affidavit to the effect that additives will not be used.

R 408.30779 Pressure filter protection.

Rule 779. Section P-1505.12.6 of the code is amended to read as follows:

P-1505.12.6. Pressure filter protection. When potable water is to be passed through a pressure filter using granular or suspended media, such as sand, zeolite, ion exchange resins, carbon, or similar product, in order to remove dissolved or suspended matter, not less than a single check valve shall be installed between the filter and the nearest upstream branch or point of use.

R 408.30779a Automatically regenerated water conditioners.

Rule 779a. Section P-1505.12.7 of the code is amended to read as follows:

P-1505.12.7. Automatically regenerated water conditioners. Automatically regenerated water conditioners which require a chemical or mineral solution for regeneration and which have the potable water supply directly connected to or submerged in the solution tank shall be protected by an approved double check valve assembly. The double check valve assembly shall be installed on the supply side of the conditioner tank.

R 408.30779b Deionizers and demineralizers.

Rule 779b. Section P-1505.12.8 of the code is amended to read as follows:

P-1505.12.8. Deionizers and demineralizers. Deionizers and

demineralizers which are regenerated with solutions of mineral acids

and alkalies shall have the water supply protected in accordance with the following provisions:

(a) Regenerating solutions applied by injectors. Where the regenerating solutions are applied to the resin beds by potable water-operated injectors, a pressure-type vacuum breaker shall be installed at the required elevation above the highest point in the deionized water system.

If such an elevation for the protective device is not practicable, a reduced pressure zone-type backflow preventer shall be installed in the potable water branch supplying the system.

(b) Regenerating solutions pumped. Where the regenerating solutions are pumped through the resin beds, as in mixed bed deionizing, a reduced pressure zone-type backflow preventer shall be installed in the water supply branch to the system.

R 408.30780 Water supplies to refrigeration equipment.

Rule 780. Section P-1505.12.9 of the code is added to read as follows:

P-1505.12.9. Water supplies to refrigeration equipment. A water control valve, either manually or automatically operated, shall not be installed on the water discharge piping from a refrigerant containing a component of a refrigerating system which is, for example, shell-and-tube condensers, double-pipe condensers, water-jacketed compressor cylinders, etc., supplied with potable water in such a way that there would be direct contact between potable water and the refrigerant upon leakage through the wall separating the 2 fluids.

R 408.30780a Manifolded water supplies to refrigeration equipment.

Rule 780a. Section P-1505.12.I0 of the code is added to read as follows:

P-1505.12.10. Manifolded water supplies to refrigeration equipment. If 2 or more refrigerants containing components are served in parallel from a common water supply pipe and it is necessary to connect the water discharge piping into a common discharge manifold, valves may be installed on the individual discharge pipes between the components and the manifold, if a check valve is installed in the common water supply pipe upstream from all refrigerant containing components.

Also adjacent to and at the outlet side of the check valve, an approved pressure relief valve, set to relieve at 5 p.s.i. above the maximum water pressure at the point of installation shall be provided if the refrigeration units contain more than 20 pounds of refrigerants.

R 408.30780b Water and steam interconnections protection.

Rule 780b. Section P-1505.12.11 of the code is added to read as follows:

P-1505.12.11. Water and steam interconnections protection. If potable water and steam piping are interconnected for mixing and heating of the water, there shall be a vacuum breaker and check valve in the water line adjacent to the point of connection and there shall be no shut-off valve in the common line downstream from the point of connection.

The check valve shall be located on the discharge side of the vacuum breaker.

R 408.30785 Relief valve discharge.

Rule 785. Section P-1506.4.2 of the code is amended to read as follows:

P-1506.4.2. Relief valve discharge. Relief valve discharge pipe shall be rigid pipe approved for water distribution with a rating of 210 degrees Fahrenheit.

The discharge piping shall be the same diameter as the relief valve outlet and shall drain by gravity flow. Valves shall not be connected in the relief valve discharge pipe. Relief valves shall not discharge so as to be a hazard, a potential cause of damage, or a nuisance. Discharge pipe from relief valves shall terminate atmospherically not more than 4 inches from the floor with an unthreaded end. The discharge pipe from a relief valve shall not terminate outdoors or in an unheated space. When a relief valve discharges to the drainage system, it shall be by indirect connection in accordance with section P-701.1.2.

R 408.30788 Drainage and vent systems.

Rule 788. Sections P-1702.5.1 and P-1702.5.2 of the code are amended to read as follows:

P-1702.5.1. Rough plumbing: Except for outside leaders and perforated or open jointed drain tile, the piping of plumbing drainage and venting systems shall be tested upon completion of the rough piping installation by water or air and proved watertight. The administration authority may require the removal of any cleanout plugs to ascertain if the pressure has reached all parts of the system. Either of the following methods shall be used:

(a) Water test: The water test shall be applied to the drainage system either in its entirety or in sections after rough piping has been installed. If applied to the entire system, all openings in the piping shall be tightly closed, except the highest opening, and the system filled with water to the point of overflow. If the system is tested in sections, each opening shall be tightly plugged, except the highest opening of the section under test, and each section shall be filled with water, but a section shall not be tested with less than a 10-foot head of water. In testing successive sections, at least the upper 10 feet of the next preceding section shall be tested, so that a joint or pipe in the building, except the uppermost 10 feet of the system, shall not have been submitted