Crestline Valve Specification

Crestline Plumbing Specification (gear operators required on 6 in. and larger)

Butterfly valves 6 inches and larger must be equipped with a gear operator, not a lever handle. Lever handles on large valves allow rapid closure that causes water hammer, and they cannot provide the fine control needed for balancing. Gear operators also prevent unauthorized operation.

Crestline Plumbing Specification / ASME B16.34

Valves must be rated to exceed the maximum operating pressure by at least 50% per Crestline specifications. A 100 psi rated valve on a 125 psi system is under-rated and risks catastrophic valve body failure. A minimum 200 psi rated valve (Class 150) is required.

Crestline Seismic Specification

This is correct. Per Crestline spec, in-line duct equipment weighing 75 pounds or less is considered seismically braced by the duct system itself, provided it is rigidly attached to the duct. At 65 pounds, the humidifier is under the 75-pound threshold. The duct's own seismic bracing (transverse at 30 ft max, longitudinal at 60 ft max) provides adequate restraint for the lightweight equipment. If the humidifier exceeded 75 pounds, it would require independent seismic supports regardless of its duct connection.

Crestline Valve Specification / AWWA C504

Butterfly valves 6 inches and larger require gear operators, not lever handles. An 8-inch butterfly valve with a lever handle is a code violation for two reasons. First, the specification explicitly requires gear operators for valves 2.5 to 12 inches, with gear operators mandatory at 6 inches and above. Second, the torque required to operate an 8-inch butterfly valve against system pressure is too high for safe one-handed lever operation — especially at 7 feet above the floor where an operator would be reaching overhead. Gear operators provide controlled, gradual valve operation that prevents water hammer from rapid closure.

Crestline Valve Specification / MSS SP-110

These ball valves meet all specification requirements for 2-inch and smaller service. The 600 PSI rating meets the requirement for ball valves 2 inches and smaller. Full-port design ensures minimal pressure drop and allows full flow capacity — a reduced port valve would restrict flow and create an unacceptable pressure drop. The PTFE (Teflon) seat material provides excellent chemical resistance, low friction, and is compatible with chilled water temperatures. The 600 PSI rating at 42°F operating temperature provides substantial safety margin over the 125 PSI system pressure.

Crestline VFD Specification

The 25-foot cable run exceeds the 20-foot maximum allowed without engineer approval. Long VFD output cables cause reflected wave voltage spikes at the motor terminals that can reach 2-3 times the DC bus voltage, destroying motor winding insulation over time. At 25 feet without mitigation, peak voltage at the motor terminals can exceed the insulation rating of standard motors. The electrician must either: (1) get engineer approval and install an output reactor or dV/dt filter, (2) relocate the VFD closer to the motor, or (3) use an inverter-duty motor rated for the higher voltage peaks.