What Does Mechanical Plan Drawing Look Like

Mechanical Drawings

The comprehend sheet for mechanical drawings should contain appropriate notes, legends (chart or table of symbols and abbreviations), and details. The mechanical plan specifies the pattern of or the modifications to the mechanical system, ductwork layout and dimensions, mechanical equipment location, damper locations, design air-delivery rates, diffuser locations, thermostat locations, and supplemental cooling systems if required. Mechanical plans are commonly identified as M-one, M-ii, M-3, etc. Some consultants prefer the heating, ventilating, and air-conditioning drawings, commonly referred to as the HVAC drawings, to be sequentially numbered and prefixed by the letter of the alphabet "H"; the plumbing drawings to be prefixed by the alphabetic character "P"; and the fire-protection drawings to be prefixed by the messages "FP." Most of the work shown on these types of drawings is in plan view. Because of the diagrammatic nature of mechanical drawings, the plan view offers the best illustration of the location and configuration of the work.

Due to the big amount of information required for mechanical piece of work and the shut proximity of piping, valves, and connections, the engineer utilizes a variety of symbols and abbreviations to convey the design intent. Examples of these symbols and their significant can exist found in Chapter 8.

Effigy 6.15 Foundation plan for a residence.

Figure six.xvi Typical examples of structural details.

Mechanical systems deal with the heating and cooling of buildings or spaces. The 2 primary methods of heating and cooling use air or h2o. In an all-air system hot or common cold air is transported to the space with supply and render air ducts. A typical case is a residential forced-air furnace. The furnace uses gas or oil to estrus the air. The air is forced through the ductwork past an electrically powered fan in the furnace. A separate air-workout unit is installed for common cold air. For most commercial buildings, a large unit, oftentimes located on the roof, powers the all-air arrangement. Supply-air ductwork, registers, and render-air grilles are required in all spaces within the building.

An all-water heating arrangement uses a type of coil through which hot h2o is circulated. The nearly common example is the fin-tube radiator establish in older homes, typically located in front end of a window. Today the most mutual system is the radiant floor heating panel.

An all-electrical heating system uses electricity to heat elements within a radiator. The about common is the baseboard heater. It is used when a furnace is not installed. For example, many small cottages apply baseboard heaters. Smaller, older commercial buildings rely on a baseboard installation. This organisation tin also exist found in larger commercial buildings every bit an add-on to other systems. An electric radiator with a built-in fan might be located at an outside archway door to provide extra heat on the inside.

The mechanical drawings provide the client, the builder, and the let section with the consummate HVAC layout for the job. These drawings are typically function of the construction-cartoon set up. They are submitted with the construction drawings for a edifice-permit application (Figure 6.17). They are also part of the bundle for pricing the project. They are used for construction. All ducting, venting, exhaust fans, and heating and/or cooling units must be supplied and installed as per the approved drawings.

A mechanical-engineering consultant produces the mechanical drawings. Often the same person or company will produce the electrical and plumbing drawings. These drawings must comply with the diverse building codes including all provincial and local codes.

Generally, the engineer uses these plans and incorporates his/her ducting layout. Diffusers, returnair grilles, and exhaust fans are fatigued in as symbols. Heating and/or cooling systems are specified and their location indicated. Legends, schedules, details, and notes specific to the project are added.

On small projects, all information required is covered on one or two cartoon sheets. For large or complex projects, many drawing pages are necessary to cover all areas of the project.

Typically, the engineer'due south drawings must notation the blazon, location, and number of heating and/or air conditioning units. HVAC and electrical connections are specified, equally well equally whatsoever connections to gas lines or water systems. The thermostat blazon, location, and number are also noted. Figure 6.18 shows a refrigerant-pipage detail diagram

Many projects require that heat-loss and estrus-proceeds calculations be provided. Air-balancing information or air-distribution-device schedules are usually included. The data required depends on the blazon of project beingness built.

Many cities and towns have energy-conservation regulations. The engineer'southward drawings must bide by all codes and bylaws pertaining to the metropolis, town, or province where the project is located.

The following are typically included in a set of mechanical drawings:

• Plans showing the size, blazon, and layout of ducting

• Diffusers, oestrus registers, return-air grilles, and dampers

• Turning vanes and ductwork insulation

• HVAC unit types, quantities, and location

• Thermostat types, quantities, and location

• Electric, water, or gas connections

Effigy 6.17A Typical HVAC floor layout showing ducting drawn to a scale of 1/8 inch = 1 foot, 0 inches. HVAC notes and code and design weather condition are included on the sheet.

• Ventilation and exhaust fans

• Symbol legend, full general notes, and specific key notes

• Heating and/or cooling load summary

Other information, depending on the complexity of the projection, may include:

• Connexion to existing systems

• Demolition of function or all of existing systems

• Smoke detector and firestat for ducting

• Thermostat programming

Figure half-dozen.17B Diagram showing HVAC ducting sizes, connections, and layout.

• Heat-loss and heat-proceeds calculations per area

• Round-duct, turning-vane, and lay-in-diffuser details

• Special weather condition, such equally seismic restraint codes

Engineer's drawings are required for all commercial projects involving HVAC work, including additions, renovations, or new structure. A permit is required prior to commencing whatever on-site work.

Drawings and permits are also needed for residential projects when whatsoever substantial work related to HVAC is to have place. For small projects, a licensed mechanical contractor tin can provide the information required to obtain a allow.

Concept and designs are the first stage of whatsoever project. When established, the next stage is structure drawings. Once the floor and reflected-ceiling plans are complete, they are passed to the engineer to produce the mechanical drawings. The engineer's drawings become part of the construction drawing set.

Figure 6.18 Schematic diagram for a refrigerant-piping particular for air conditioning.

REFRIGERANT PIPING DETAIL (AIR Conditioning)

Figure 6.18 Schematic diagram for a refrigerant-pipe particular for air conditioning.

Keep reading here: Plumbing Drawings

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Source: https://www.northernarchitecture.us/building-codes/mechanical-drawings.html

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