SPECIFICATION P

FLEXIBLE METALLIC HOSES Rubber connectors are preferable for sound and vibration attenuation, but careful consideration must be given to pressure and temperature and locations other than machine rooms. Stainless is recommended in locations away from equipment rooms and temperatures over 250°F (120°C) in continuous service or pressures beyond published rubber pressure ratings. The very short…

SPECIFICATION O

FLEXIBLE RUBBER CONNECTORS An old sales technique is the flexing of a hand held rubber or metallic hose to show its flexibility. Nothing is limper than a rolled or folded canvas fire hose. However, when the hose is pressurized, it takes two men to bend and direct it. All flexible connectors are stiff under pressure,…

SPECIFICATION N

COMPLETE ROOFTOP SPRING CURBS In 1982 we showed the following method for increasing deflection by suspending units from springs on top of a steel frame work and using the CMAB curb without springs as the seal. There were 3 or 4 very successful installations, but the method was too cumbersome and expensive. We found the…

SPECIFICATION M

CURB MOUNTED ALUMINUM BASES NOMINAL 1”(25mm) DEFLECTION Not too many years ago, cooling towers and curb mounted exhaust fans were the only pieces of mechanical equipment to be found on rooftops. This has all been changed as curb mounted air conditioning equipment is commanding a larger share of the market. While rooftop equipment manufacturers do…

SPECIFICATION L

K Concrete Welded Base Concrete bases are recommended under pumps as they are more rigid and a better choice in maintaining alignment. They need not be selected for the additional mass that is needed under highly unbalanced machines such as slow speed horizontal or vertical compressors. If the building can handle the added weight, floating…

SPECIFICATION K

WF Steel Beam Base A complete steel base is not required for equipment such as Absorption Machines, Reciprocating Compressors, Shell Mounted Centrifugal Compressors, H&V units, etc. Steel members improve stability, lower operating heights and in the case of H&V units prevent distortion of sheet metal legs or base angles. The use of saddles and brackets…

SPECIFICATION J

WF Steel Beam Base Our very early specifications merely called for “sufficient base rigidity” to handle belt tension and keep the drive in alignment. There had been no criteria for base stiffness or design and every vendor had his own version of what might be minimally acceptable as there never was a unified code. Pump…