About Us

In 1973, when founder Bob Drue started Associated Flow Controls it was a company that primarily dealt with natural gas, oil, and engineering companies in Northern California. Less than two years later, while continuing to deal with the natural gas industry, Associated Flow Controls began servicing the steam industry.

Our knowledge and impact on the steam industry and their control requirements has grown steadily over the last 4 decades, and so has our market base. In fact there is not an industry which we do not currently service.

Associated Flow Controls prides itself on not only supplying the product, but in the relations we build after the sale, through our extensive product knowledge and experienced sales/field support team.

Products

Steam System Solutions

  • Steam Traps
  • Steam Regulators
  • Temperature Regulators
  • Pneumatic Control Valves
  • Strainers & Safety Valves
  • Steam Flow Meters
  • Pipeline Auxiliaries
  • Heat Transfer Packages

FloMec Flow meters

  • TM ~ Low cost PVC turbine flow meter for water service
  • G2 ~ Precision turbine flow meter, stainless, brass, aluminum, and PVDF
  • G ~ High precision turbine flow meter, high temperature option available
  • OM ~ Oval Gear Meter

Hose Station & Mixing Units

  • Mixing Units & Wash Down Station
  • Wash Down Nozzles and Hoses
  • Ram Type Drain Vales: 1″ – 12″
  • Ram Type Sampling Valves
  • Pipeline Auxiliaries
  • Heat Transfer Packages

Trerice

  • Pressure gauges and transmitters
  • Temperature measurement: dial, bimetallic, electronic, thermo wells
  • Control valves: two way, three way, single seat, dual seat

Semi-Instantaneous Water Heater

  • Storage Heaters
  • Gas Fired & Hot Water Heaters
  • Semi-Instantaneous Steam Heaters
  • Instantaneous Heaters
  • Electric Water Heaters
  • Shell & Tube Heat Exchangers
  • Storage Vessels

Red Valve

  • Air operated pinch valves
  • Control pinch valves
  • Manual pinch valves
  • Pressure sensors
  • Slurry knife gate valves
  • Redflex expansion joints
  • Tideflex check valves

Steam System Solutions

  • Steam Traps
  • Steam Regulators
  • Temperature Regulators
  • Pneumatic Control Valves
  • Strainers & Safety Valves
  • Steam Flow Meters
  • Pipeline Auxiliaries
  • Heat Transfer Packages

Hose Station & Mixing Units

  • Mixing Units & Wash Down Station
  • Wash Down Nozzles and Hoses
  • Ram Type Drain Vales: 1″ – 12″
  • Ram Type Sampling Valves
  • Pipeline Auxiliaries
  • Heat Transfer Packages

Semi-Instantaneous Water Heater

  • Storage Heaters
  • Gas Fired & Hot Water Heaters
  • Semi-Instantaneous Steam Heaters
  • Instantaneous Heaters
  • Electric Water Heaters
  • Shell & Tube Heat Exchangers
  • Storage Vessels

FloMec Flow meters

  • TM ~ Low cost PVC turbine flow meter for water service
  • G2 ~ Precision turbine flow meter, stainless, brass, aluminum, and PVDF
  • G ~ High precision turbine flow meter, high temperature option available
  • OM ~ Oval Gear Meter

Trerice

  • Pressure gauges and transmitters
  • Temperature measurement: dial, bimetallic, electronic, thermo wells
  • Control valves: two way, three way, single seat, dual seat

Red Valve

  • Air operated pinch valves
  • Control pinch valves
  • Manual pinch valves
  • Pressure sensors
  • Slurry knife gate valves
  • Redflex expansion joints
  • Tideflex check valves

Understanding Steam

Steam is so familiar to all of us that we easily forget what a marvelous thing it really is. Steam will carry twenty times the BTUs per pound that Freon 12 will, nearly 15 times the BTUs per pound of F22, and over twice that of ammonia. Even when we use nuclear energy for power, it is only to heat water to make steam. For all of this, we tend to take steam for granted without much thought to how it really is produced or how it works best for us. So, let’s take a very basic, but serious look at steam. Boilers make steam by boiling water. That’s about the most oversimplified statement we could make. Some very interesting things happen when water is boiled. At atmospheric pressure, water expands 1,600 times its original volume when turned into steam. This explains why a tea kettle may put off a plume of vapor half the morning before running dry.

Water at atmospheric pressure boils at 212 degrees F. The boiling water in an open vessel measures 212 degrees F. Once 212 degrees F is reached, all heat applied to the vessel does not increase the water temperature. The applied energy is going into changing the water from a liquid into steam, a vapor. The steam will give up this energy before turning back to a liquid. This energy is called Latent Heat and for most purposes this is considered the usable energy of steam.

Below the boiling point, the heat applied to the vessel goes into the water and raises the water’s temperature. We are able to sense this temperature change with a thermometer and we call this heat Sensible Heat.

For most purposes for which steam is used, it is the Latent Heat of steam that we utilize, for after the Latent Heat is given up, the steam re-condenses back into a liquid from a vapor. Wherever possible we return this condensed steam or water, commonly called condensate, back to the boiler for reuse. This conserves a large part of the Sensible Heat we had to apply to raise the temperature of the water up to 212 degrees F. Even if this condensate has come into contact with contaminating materials that make it unsuitable for return to the boiler, it can often be still be used to help heat new incoming water through a heat exchanger and reduce fuel requirements.

So far, we have only talked about an open vessel to the atmosphere. If we close this to atmosphere and as we continue to add heat above the boiling point, the expanding steam causes the pressure to raise. This increase in pressure however causes the temperature at which the water boils to rise as well. This calls for a further supply of Sensible Heat to get the water to its new, higher boiling point level. At the same time though, The Latent Heat required to convert the higher temperature water into steam is reduced. The next result is only a slight increase in the Total Heat required for each pound of steam. But, since that same pound (by weight) of steam will occupy 26.8 cubic feet of space at atmospheric pressure and only 2.15 cubic feet at 200 lbs per square inch pressure, it is easy to see why higher pressure is used in industry throughout the world! While occupying only 1/8 the volume at 200 psi, steam has only required 4 ½% more heat per pound. Smaller piping will serve the same system and will reduce piping radiant heat loses as well.

Steam can be in one of three forms, Wet, Dry or Superheated. Wet steam contains small water droplets entrained within it. These droplets contain no Latent Heat and therefore have nothing to contribute to the process before they are returned to condensate. Just 6% of water particles at 200 PSIG reduces the Total Heat in a pound of steam to less that the Total Heat in a pound of dry steam at atmospheric pressure.

Dry steam requires the elimination of water particles from the steam line. This can be done mechanically with baffles in the steam flow design so that water particles are deposited and left behind, or by removing the wet steam from the water surface and applying additional heat to drive all the water particles into steam. Flue gas heat is often used for this additional heat.

Superheated Steam occurs when enough additional heat is applied to raise the steam temperature to any level above that of saturated dry steam. Some superheat is sometimes required to make sure that dry steam is available at the end of a long steam line. It would seem that superheat would be the course to take in all cases as a means to transfer more heat. In reality, the amount of additional heat transferred is not that great. One pound of steam at 200 PSIG superheated another 100 degrees F more has gone from 1200 BTUs Total Heat to 1260 BTUs, a gain of only 4.8%. While that small change was taking place, the saturated steam started acting like a perfect gas and expanded in volume, from our original 2.14 cubic feet to a volume change of 14.5%. The heat content per cubic foot of steam has actually decreased by superheating. Available latent Heat or usable heat in BTUs actually increases when you use lower pressure. This is why lower pressure is used for comfort heating in buildings in colder climates.

Reflecting then, we have eight times the volume of steam in the same space by raising the pressure from atmospheric to 200 PSIG but, we have a 14.5% decrease through superheating another 100 degrees at the same 200 PSIG. Superheat is therefore an advantage only when the heat requirement can be met by the smaller amount of energy required in the superheat and when the higher temperature gradient from the hotter steam is required by the process job.

For steam engines or turbines in simple cycle and combined cycle power plants (HRSG or, heat recovery steam generators), it is often part of the power unit’s design to use superheated steam. This is a specialized application of steam utilizing the entropy of steam, (which needs to be treated separately). Suffice it to say that after expansion through the engine, this steam has nearly used all of its heat units that were put into it and can often be put into additional use as in process applications, such as preheating supply water for makeup use.

We have not attempted to discuss all areas of steam use. For example, we have said nothing about steam trapping, a very necessary consideration in most steam systems. But we have zeroed in on steam and most of its basic simplicity, its great heat transfer capabilities, and the versatility of its applications. When these are taken together, it is obvious that steam will always continue to be a very important tool to industry. It will not become obsolete for there is nothing else that even comes close to having these properties.

Randall J. Harwood, circa 1980.

Misc Readings & Research;

Click to view:     Pipe Fitters Handbook

Click to view: 3 Element Boiler Steam Drum Control

Click to view: Saturated Steam Tables

Click to view: Understanding Steam Cycle Chemistry

Click to view: Fluid Compatibility Table

Click to View: Steam Conditioning Valves: Case Study

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Services

CONDENSATE RECOVERY

(OPEN SYSTEM)

Pumping high temperature condensate without cavitation and no mechanical seals to create problems. Provides maximum heat energy recovery

CONDENSATE REMOVAL FROM PROCESS VESSELS & HEAT EXCHANGERS

(OPEN SYSTEM)

Fast, efficient condensate removal ensuring optimum process efficiency and heat energy recovery.

Instantaneous Steam-Fired Water Heater

(CLOSED SYSTEM)

 Removal of condensate under all pressure conditions ensures stable air temperatures. Also, prevents bottom end tube corrosion and potential damage due to water hammer and freezing.

CONDENSATE REMOVAL AND FLASH RECOVERY

(CLOSED SYSTEM)

 To reclaim high temperature condensate and recovery of the fl ash steam to supplement low pressure steam requirements.

CONDENSATE RECOVERY

(OPEN SYSTEM)

Pumping high temperature condensate without cavitation and no mechanical seals to create problems. Provides maximum heat energy recovery

CONDENSATE REMOVAL FROM PROCESS VESSELS & HEAT EXCHANGERS

(OPEN SYSTEM)

Fast, efficient condensate removal ensuring optimum process efficiency and heat energy recovery.

Instantaneous Steam-Fired Water Heater

(CLOSED SYSTEM)

 Removal of condensate under all pressure conditions ensures stable air temperatures. Also, prevents bottom end tube corrosion and potential damage due to water hammer and freezing.

CONDENSATE REMOVAL AND FLASH RECOVERY

(CLOSED SYSTEM)

 To reclaim high temperature condensate and recovery of the fl ash steam to supplement low pressure steam requirements.

Join Our Team

Please send your resume to:
mike@afcsteamtraps.com

Contact Us

Headquarters

30 Beta Court
San Ramon, CA 94583

Mike Drue
Sales Engineer/Technical Support
mike@afcsteamtraps.com
Ph: (925) 820-1216 ext. 100

Stacey Alexander
Accounting
accounting@afcsteamtraps.com
Ph: (925) 820-1216 ext. 101

Sacramento Office

Tim Ruffino
Northern California Sales Engineer
timmy@afcsteamtraps.com
Ph: (916) 919-0265

Bay Area Office

Laird Hagie
Bay Area Account Representative
laird@afcsteamtraps.com

Ph: (925) 820-1216 x102
Cell: (925) 895-7223

 

Matt Coplan
Bay Area Regional Sales Manager
matt@afcsteamtraps.com

Ph: (925) 820-1216
Cell: (925) 766-5230


Bay Area Sales Engineer

Ph: (925) 820-1216

Cell: (925) 766-5230

Central Valley Office

1-925-820-1216

Coastal Office

1-925-820-1216

General Sales Inquires

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