HomeMy WebLinkAboutOrd 191-2005 Mechanical Code Amendments.pdfCITY OF ANNA, TEXAS
ORDINANCE NO. 191-2005
AN ORDINANCE OF THE CITY OF ANNA, TEXAS, AMENDING ORDINANCE
NO. 2002-22, WHICH ADOPTED THE 2000 EDITION OF THE
INTERNATIONAL MECHANICAL CODE, BY REVISING CHAPTER 1
(ADMINISTRATION), CHAPTER 3 (GENERAL REGULATIONS), CHAPTER 5
(EXHAUST SYSTEMS), AND CHAPTER 6 (DUCTS AND AIR TRANSFER
OPENINGS) OF THE 2000 EDITION OF THE 2000 INTERNATIONAL
MECHANICAL CODE; PROVIDING A REPEALER CLAUSE; PROVIDING A
SAVINGS CLAUSE; AND PROVIDING FOR AN EFFECTIVE DATE
WHEREAS, the City Council has determined the need for revising the City's existing residential
code; and
WHEREAS, the City Council has received recommendations for said revisions from qualified
professionals in the building inspection trade; and
WHEREAS, the City Council desires to adopt and implement said recommendations; now
therefore
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF ANNA, TEXAS:
Section 1. International Mechanical Code Revised.
The city council hereby adopts certain revisions to the 2000 Edition of the International
Mechanical Code, as originally adopted by Ordinance 2002-22, said revisions being hereby
attached to this ordinance as Exhibit A and hereby made an integral part of this ordinance.
Section 2 Repeal Clause
All parts of any ordinance in conflict with the provisions of this ordinance are to the extent of
such conflict hereby repealed.
Section 3 Savings Clause
If any provision of this ordinance shall be held to be invalid or unconstitutional, the remainder
of such ordinance shall continue in full force and effect the same as if such invalid or
unconstitutional provision had never been a part hereof.
ORD 191-2005 Mechanical Code Amdts.doc Page 1 of 2 02-22-2005
Section 4 Effective Date
This ordinance shall be effective upon the posting and/or publication of its caption as required
by law and the City Secretary is hereby directed to implement such posting and/or publication.
PASSED by the City Council of the City of Anna, Texas, this 22nd day of February, 2005,
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APPROVED:
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ATTESTED: z
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ORD 191-2005 Mechanical Code Amdts.doc Page 2 of 2 02-22-2005
EXHIBIT "A"
CITY OF ANNA AMENDMENTS
2000 INTERNATIONAL MECHANICAL CODE
The following additions, deletions, and amendments to the 2000 International Mechanical
Code adopted herein are hereby approved and adopted.
Chapter 1 Administration
Section 102 Applicability
Section 102.8 Referenced codes and standards. The codes and standards referenced
herein shall be those that are listed in Chapter 15 and such codes, when specifically
adopted, and standards shall be considered part of the requirements of this code to the
prescribed extent of each such reference. Where differences occur between provisions of
this code and the referenced standards, the provisions of this code shall apply. Whenever
amendments have been adopted to the referenced codes and standards, each reference to
said code and standard shall be considered to reference the amendments as well. Any
reference to NFPA 70 or the ICC Electrical Code shall mean the Electrical Code adopted by
the City of Anna as it currently exists or may be amended.
Chapter 3 General regulations
Section 302 Protection of structure
Section 302.3 Cutting, notching and boring in wood framing members. When
permitted by the Building Code as adopted by the City of Anna, the cutting, notching and
boring of wood framing members shall comply with Sections 302.3.1 through 302.3.3.
Section 304 Installation
Section 304.5 Private garages. This section is deleted in its entirety.
Section 304.8 Clearances from grade. Equipment and appliances installed at grade level
shall be supported on a level concrete slab or other approved material extending above
adjoining grade a minimum of three (31) inches or shall be suspended a minimum of six (6)
inches above adjoining grade.
Section 304.11 Minimum burial depth. Underground fuel piping systems shall be
installed a minimum depth of eighteen (18) inches below grade.
Section 306 Access and service space
Section 306.3 Appliances in attics. Attics containing appliances requiring access shall be
provided with an opening and unobstructed passageway large enough to allow removal of
the largest appliance. The passageway shall not be less than thirty (30) inches high and
twenty-two (22) inches wide and not more than twenty (20) feet in length measured along
the centerline of the passageway from the opening to the appliance. The passageway shall
have continuous solid flooring not less than twenty-four (24) inches wide. A level service
space not less than thirty (30) inches deep and thirty (30) inches wide shall be present at
the front or service side of the appliance. The clear access opening dimensions shall be a
minimum of twenty (20) by thirty (30) inches, or larger where such dimensions are not
large enough to allow removal of the largest appliance. As a minimum, access to the attic
space of residential uses shall be provide by one of the following:
1. A permanent stair or ladder fastened to the building.
2. A pull down stair with a 300 -pound capacity.
3. An access door from an upper floor level.
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Exception: The passageway and level service space are not required where the appliance is
capable of being serviced and removed through the required opening.
Section 306.5 Equipment and appliances on roofs or elevated structures. Where
equipment or appliances requiring access are installed on roofs or elevated structures at a
height exceeding sixteen (16) feet, such access shall be provided by a permanent approved
means of access. Permanent exterior ladders providing access need not extend closer than
eight (8) feet to the finish grade or floor level below and shall extend to the equipment and
appliance's level service space. Such access shall not require climbing over obstructions
greater than thirty (30) inches high or walking on roofs having a slope greater than four (4)
units vertical in twelve (12) units horizontal (33% slope).
A receptacle outlet shall be provided at or near the equipment and appliance location in
accordance with the Electrical Code. Low voltage wiring of 50 volts or less shall be installed
in a manner to prevent physical damage.
Section 306.6.1 Catwalk. On roofs having slopes greater than four (4) units vertical in
twelve (12) units horizontal, a catwalk at least sixteen (16) inches in width with substantial
cleats space not more than sixteen (16) inches apart shall be provided from the roof access
to the working platform at the appliance.
Section 306.7 Water heaters above ground floor. When the mezzanine or platform in
which a water heater is installed is more than eight (8) feet above the ground or floor level,
it shall be made accessible by a stairway or permanent ladder fastened to the building.
Section 306.7.1 Whenever the mezzanine or platform is not adequately lighted or access
to a receptacle outlet is not obtainable from the main level, lighting and a receptacle outlet
shall be provided in accordance with Section 306.3.1
Section 307 Condensate disposal
Section 307.2.1 Condensate disposal. Condensate from all cooling coils and evaporators
shall be conveyed from the drain pan outlet to an approved place of disposal. Condensate
shall not discharge in a publicly exposed area such as into a street, alley, sidewalk or other
areas so as to cause a nuisance.
Section 307.2.2 Drainpipe size. Add a second paragraph to this section as follows:
Condensate waste pipes from air-cooling coils may be sized in accordance with equipment
capacity as follows:
Equipment Capacity
Minimum Condensate Pipe
In tons of refrigeration
Inside diameter
Up to 20 tons
3/4 inch
Over 20 to 40 tons
1 inch
Over 40 to 90 tons
1/1/4 inch
Over 90 to 125 tons
1-1/2 inch
Over 125 to 250 tons
2 inch
The size of condensate waste pipes may be for one unit or a combination of units, or as
recommended by the manufacturer. The capacity of waste pipes assumes a 1/8 -inch per
foot slope, with the pipe running three-quarters full.
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Section 307.2.3 Auxiliary and secondary drain systems. Add item number 4 to this
section as follows:
4. Discharge, as noted, shall be to a conspicuous point of disposal to alert occupants in the
event of a stoppage of the drain. However, the conspicuous point shall not create a hazard
such as dripping over a walking surface or other areas so as to create a nuisance.
Chapter 5 Exhaust systems
Section 504 Clothes dryer exhaust
Section 504.6.1 Maximum length. The maximum length of a clothes dryer exhaust duct
shall not exceed twenty-five (25) feet from the dryer location to the outlet terminal with not
more than two (2) bends. When extra bends are installed, the maximum length of the duct
shall be reduced 2.5 feet for each 45 -degree bend and 5 feet for each 90 -degree bend that
occur alter the first two bends, measuring in the direction of airflow.
Chapter 6 Duct systems
Section 604 Insulation
Section 604.1 General. Duct insulation shall conform to the requirements of Sections
604.2 through 604.11 and the International Energy Conversation Code. Should there be any
conflicts between this section and the energy code, the energy code shall take precedence.
Section 607 Ducts and air transfer openings
Section 607.2.2 Hazardous exhaust ducts. Hazardous exhaust duct systems shall
extend directly to the exterior of the building and shall not extend into or through ducts or
plenums. Penetration of structural elements shall conform to this section and the Building
Code except that fire dampers are not required at penetration of fire-resistant rated
assemblies.
Section 607.5.1 Firewalls. Ducts and transfer openings permitted in firewalls in
accordance with Section 705.11 of the Building Code shall be protected with approved fire
dampers installed in accordance with their listing. Hazardous exhaust ducts shall not
penetrate firewalls.
Section 607.6.1 Through penetrations. In occupancies other than Groups 1-2 and 1-3,
penetrations by an air duct through a fire-resistant rated floor/ceiling assembly that
connects not more than two stories are permitted without shaft enclosure protection where
a fire damper is installed at the floor line.
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