Mechanical seals cartridge

Stuffing Box with Mechanical Seal. Mechanical seal shall he of the (single inside) (single outside) (double inside) (cartridge) type and (balanced) (unbalanced). 

To this day, balanced mechanical seals using o-rings are the standard in industry. Meehanical seals eontinue to evolve in sealing face technology, computer design, finite element analysis, cartridge designs, split seals, double or dual seals, and dry gas seals. 

Cartridge mechanical seals are designed so that the rotary and stationary elements, the springs and secondary seals, the gland, sleeve and all accompanying parts are in one integral unit. It installs in one piece instead of the numerous individual pieces. 

Here is an illustration of a typical cartridge mechanical seal mounted on a shaft in the seal chamber of the pump (Figure 13-18). 

For most applications, the balanced, o-ring cartridge seal will adequately handle every pump, liquid, and condition in a modern industrial process plant. There are, however, some industrial pumping applications that will present problems to even the best of mechanical seals. Should one of these applications cause the seal to give less than desirable performance, the next step to take in extending the service life of the seal (and ultimately the pump) is to install some type of environmental control to protect and isolate the seal components from the fluid. Let s consider some difficult sealing applications. 

Table 2-3—Standard Dimensions for Seal Chambers, Seal Gland Attachments and Cartridge Mechanical Seal Sleeves (mm/in.)...

Cartridge type mechanical seals shall include sleeve and gland. 

Table 6 — Standard dimensions for seal chambers, seal gland attachments and cartridge mechanical seal...

Gasket. The gland-to-seal chamber gasket or 0-ring used for mechanical seals shall be confined on the atmospheric side to prevent blowout. It is acceptable for cartridge seals to pilot off of the shaft and not require a register fit to the seal chamber. 

A fermentation vessel holds 40 m of liquor that must be kept sterile. Wholesale price of the product is 200/m. Because of the consequences of contamination, an expensive mechanical seal, costing 3000, is installed. Dynamic run-out at the seal is greater than expected, however, and occasionally the product becomes contaminated. This happens on average once a year and a fresh seal cartridge costing 2000, is installed. Lost production is quickly made up when a new seal is installed. 

Cartridge-Type Double Mechanical Seal Motor... 

As the breech mechanisms of present guns are not designed to achieve complete sealing off the gases of combustion(complete obturation), the base of combustible cartridges should be made of a non-combustible material. This material can be either metal(brass or steel) or a noncombustible plastic. Obturators prepd from polyethylene are described in Ref 13-Cartridges prepd by these methods are known as partially combustible(Rei 15)... 

Bubble-jet cartridges actually have a liquid ink reservoir. The ink in these cartridges is sealed inside. Once the ink runs out, the cartridge must be removed and discarded. A new, full one is installed in its place. Because the ink cartridge contains ink as well as the printing mechanism, it s like getting a new printer every time you replace the ink cartridge. 

The Ektachem 700 analyzer has been constructed in such a manner that mechanical parts can be monitored by computer. This results in easy operation, maintenance and problem-free servidng. Colorimetric, potentiometric and kinetic measurements can be performed. All the steps required for the reaction take place in the slides. These enable a quantitative determination of constituents of serum or plasma samples and some constituents of urine or cerebrospinal fluid. The slides are stored in cartridges (Fig. 22) that are sealed in aluminium foil. Each slide can be used for only one assay and is ejected directly after the measurement. 

Figure 5. Gelman pleated crossflow filter cartridge. Cartridge components (A) a porous pleated support screen to provide mechanical support under applied pressure (B) the pleated microporous filtration element (C) the pleated spacer which creates the thin flow channel and promotes turbulent flow (D) the impermeable film which creates the flow channel (E) a porous support tube to provide an exit for permeate (F) open-end cap which provides for exit of product flow (G) closed-end cap completely which seals one end of module (H) outer seal ring which creates the seal between the impermeable film in the module and the interior of the housing. The back pressure support tube is not pictured. The ends of the cartridge are potted and sealed. A space between the ends of Film D and the end seals is provided to allow the entrance and exit of the flow-channel fluid.

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