Squirel cage type blower wheels can have forward curve vanes or reverse curve vanes. Will the fan motor amperage react the same for each if the suction side damper closed tight?
Does anyone know of a rule of thumb for estimating how much of a mechanical cost in a new building is actual equipment (pumps, boilers, chillers, etc.) less piping, valves, fittings, insulation, etc. I'm trying to estimate value for asset management without doing a breakdown. More or less for...
When speaking of a refrigeration plant capacity, what is meant by "kw prime mover" ? Can you directly translate the hp of the compressors to kw prime mover?
When monitoring normal pump operations (primarily hydronic centrifugal pumps), which gives a better indicator of a pump "wearing out", motor amperage readings or pressure diff across the pump? By wearing out, I mean impellor deterioration, seals tightening up or packing glands overtightened, etc.
Does anybody know where any code speaks to the issue of discharging relief valves on an ammonia refrigerant system into the suction side of the compressor? We currently have 3 valves piped in this manner, however I am having a difficult time sourcing replacements for the existing valves...
I may be in the wrong forum, thought I'd start here. We have a few spray pads in our parks. All but a couple are concrete structures. These others have asphalt for the pads. The pads are like a cooling fountain for kids to run around in. The water runs into the drains, into a tank, pumped...
Hi all, can someone tell me where registration of pressure vessels stops in regards to receivers. For instance, our shop air compressor has a 60 gal receiver and is ASME and registered and inspected regularly by the Boiler Branch. Beside it we have a portable compressor with a 10 gal receiver...
Is there a formula that would give me the volume of flue products leaving a boiler if I know the btu/hr, temp. of flue gases, percent O2, CO2 and excess air. I am trying to size an economizer for a small boiler (4100cf/hr CH4) and use the captured heat to help heat a swimming pool.
In the past...
Can someone direct me to or give me a simple explanation of the difference between wet and dry losses regarding burner combustion efficiencies? Thanks in advance for your help.
Hi folks, looking for a formula or "rule of thumb" for sizing expansion tanks on hot water heating systems. Pressures above and below 30psi (max 160psi) and temps below 240 deg.F.
Boiler sizes up to approx. 10,000mbtu/h. Any info would be greatly appreciated.
I have a 5hp end suction centrifugal pump with a 6" bronze impeller. The impeller has serious galvanic corrosion evident. This pump is part of a large decorative fountain. The pump draws water from a holding tank at the same level as the pump and pumps the water up approx. 12' to the...
