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Here are some more information for Diameter Sealed:

Make Sure You Have A Good Flange

Standard flanges of large diameter is not necessarily mate. Andrew Sloley offers a look at Plant Insites column this month.

The system was adding a three-stage vacuum ejector for steam. We would like to discuss with us from time to time by representatives of local suppliers to ensure that the instruction schedule. Everything was expected, as stated in all devices of the system in the near future to supply export and transit to the factory to complete.

Shortly before the ship date, EPR has asked me to ask me for lunch and it was unusual for him. Apparently he wanted something, but I do not know what. My boss told me, less cynical and simply enjoy a good meal. The breakfast was wonderful and went well.
Then, the EPR has gradually come to see me with a statement about a small problem with the equipment of the vacuum system. The purpose of this meal was finally free in nature.

The steam system were three stages of capacitors after each step. Capacitor reduce the load for the next phase of the condensation of the steam engine, steam from the process and the process may be condensed. The first stage is designed with ejector directly related to the first capacitor. Three parallel lines are combined into a single seal drum (also called).

We wanted at least one complete set of soaring in the shop of the seller prior to shipment. This required manufacturers to take delivery of heat and do the installation. The soaring preferred suppliers for each component suppliers to deliver directly to our site. However, she said: Just humor us for at least one laboratory in the file. In the end, we have concluded an agreement to take a train track.

The problem occurred at the meeting. The 30-in. Flange output capacitor of the first phase of mate with 30-in. Intake flange of the condenser. Have been ordered Rush to take the respective flanges and repairs.

The incident took place well before the American Society of Mechanical Engineers (ASME) was launched in 1980, official efforts to develop a single flange for pipe diameters 26 inches and above. Until then, two different models of the flange were common: the standardization of civil manufacturers (MSS) sector of the valve, and the American Petroleum Institute (API).

The MSS-44-Standard for Steel Pipe Line Flanges radically different from the API-605 standard for large diameter steel flanges carbon.

Figure 1 contrasts with the size and layout key for the category 150 of sealing films. Obviously inappropriate. The manufacturer of ejection had used a type of flange and heat had another supplier may be used.

ASME was looking for a single design of the nominal diameter of the tube, 26 inches. 48-in. Brides. Let MSS or API, or both, should be changed to create the model. Neither move would be. So far we have ASME / ANSI standard has two parts. ASME B16.47 Series A offers a the amount of MSS flanges and a series of B corresponding to the flanges API. For class 150 and class 300 (all sizes) and 36-inch and smaller classes, higher than Class 300 Series A and Series B flanges are not compatible.

Thus, while our problem is occurring before the ASME was a single standard does not eliminate the problem. Isolated mismatches continue to provide accurate information, lack of awareness of the Series A or B. Only a few engineers that two possible types of large-diameter flanges are available. If you have a large flange diameter, check what you need to make sure that what you get.

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What is balance diameter in balance ratio calculation of mechanical seal API 682?

1-What's difference between seals pressurized at the inner diameter and pressurized at outer diameter(API 682 6.1.1.7).
2-I know the conception of balance ratio, but I don't understand the balance diameter in the equation of API 682.
3- I think it depends on closing force, how the pressure is omitted from the formula?
4-Please introduce a reference for more details.

The balance ratio of a mechanical seal is an area ratio and is related to the seal face load. Balance ratio is defined as the ratio of the closing area to the opening area. Seals with a balance ratio > 1 are 'unbalanced'; ratios of < 1 are considered 'balanced'. Seals are balanced to decrease friction and wear, so you will usually move to a balanced seal at pressures of 250 psid and above (although you can use them at lower pressures as well). Unbalanced seals will be used up to 250 psid. The theory becomes more complex when you talk about metal bellows style mechanical seals; in those designs the balance ratio will increase at higher pressures primarily due to the bellows plate geometry. Visually if you were to look at the primary face of an unbalanced pusher style seal vs. a balanced pusher style seal you would notice a 'step' in the face geometry (reducing the closing area and changing the balance ratio).

=> Balance Ratio = [OD^2 - BD^2] / OD^2 - ID^2]

OD=Out side diameter of the seal face
ID= Inside Diameter of the seal face
BD= Balance Diameter of the seal face.

Balanced ratio=0.75 for water and non flashing hydrocarbon for balanced design.

Balanced ratio=0.8 to 0.85 for flashing hydrocarbon for balanced design.

Balanced ratio=1.25 to 1.35 for water and non flashing hydrocarbon for un-balanced design.

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