23 10 00 Facility Fuel Systems
• The prices in this subdivision for above- and below-ground storage tanks do not include foundations or hold-down slabs. The estimator should refer to Divisions 3 and 31 for foundation system pricing. In addition to the foundations, required tank accessories, such as tank gauges, leak detection devices, and additional manholes and piping, must be added to the tank prices.
23 50 00 Central Heating Equipment
• When estimating the cost of an HVAC system, check to see who is responsible for providing and installing the temperature control system. It is possible to overlook controls, assuming that they would be included in the electrical estimate.
• When looking up a boiler, be careful on specified capacity. Some manufacturers rate their products on output while others use input.
• Include HVAC insulation for pipe, boiler, and duct (wrap and liner).
• Be careful when looking up mechanical items to get the correct pressure rating and connection type (thread, weld, flange).
23 70 00 Central HVAC Equipment
• Combination heating and cooling units are sized by the air conditioning requirements. (See Reference No. R236000-20 for preliminary sizing guide.)
• A ton of air conditioning is nominally 400 CFM.
• Rectangular duct is taken off by the linear foot for each size, but its cost is usually estimated by the pound. Remember that SMACNA standards now base duct on internal pressure.
• Prefabricated duct is estimated and purchased like pipe: straight sections and fittings.
• Note that cranes or other lifting equipment are not included on any lines in Division 15. For example, if a crane is required to lift a heavy piece of pipe into place high above a gym floor, or to put a rooftop unit on the roof of a four-story building, etc., it must be added. Due to the potential for extreme variation—from nothing additional required to a major crane or helicopter—we feel that including a nominal amount for “lifting contingency” would be useless and detract from the accuracy of the estimate. When using equipment rental from RSMeans do not forget to include the cost of the operator(s).
Related Topics