Sealing clamp

Parallel-Leaf Cartridge. A parallel-leaf cartridge consists of several flat plates, each having membrane sealed to both sides (Fig. 13). The plates have raised (2—3 mm) rails along the sides in such a way that, when they are stacked, the feed can flow between them. They are clamped between two stainless-steel plates with a central tie rod. Permeate from each leaf drains into an annular channel surrounding the tie rod (33). 

Plate and Frame. Plate-and-frame systems consist of plates (Fig. 15) each with a membrane on both sides. The plates have a frame around their perimeter which forms flow channels ca 1 mm wide between the plates when they are stacked. The stack is clamped between two end plates, sealing the frames together. 

Leakage from Use adequate shaft sealing (mechanical or multimill ignited by pie gas purged lip or chevron seals). Harden spark or hot shafts in seal area surface., pressure tight flexible connections and clamps on mill inlets and outlets Provide adequate fixed fire protection where appropriate CCPS G-23 CCPS G-29 NFPA 13 NFPA 15 NFPA 16... 

Implement frequent maintenance of sealing surfaces and clamping systems... 

Compression presses are produced in various sizes throughout the world. In general, shaft seals are manufactured on presses with platen sizes in the range of 350 X 350 mm to 715 x 715 mm with clamp loads in the range of 1500 kN to 4000 kN. 

The plate heat exchanger consists of a frame in which closely spaced metal plates are clamped between a head and follower. The plates have corner ports and are sealed by gaskets around the ports and along the plate edges. A double seal forms pockets open to atmosphere to prevent mixing of product and service liquids in the rare event of leakage past a gasket. 

The specimens are clamped at an angle of 15° to the vertical in a baffled enclosure maintained at 50°C, and the exposure time is 24-96 h. Corrosive attack of inadequately sealed or thin films is shown by pitting. 

The patch-clamp technique is based on the formation of a high resistance seal (109-10lon) between the tip of a glass micropipette and the cell membrane it touches (gigaohm-seal). This technique allows recordings of ionic currents through single ion channels in the intact cell membrane and in isolated membrane patches at a... 

Fabrication was done by photolithography and deep reactive ion etching (DRIB). The catalyst was inserted by sputtering. Such a prepared microstructure was sealed with a Pyrex cover. The bonded micro device was placed on a heating block containing four cartridge heaters. Five thermocouples monitored temperature on the back side. A stainless-steel clamp compressed the device with graphite sheets. 

The micro channels were prepared with a cutter in a ceramic tape [70,71]. Sealings served to ensure liquid tightness. Each end of the stack of five ceramic layers was clamped between two blocks, allowing a reversible interconnection. 

Generally speaking it is best to make internal seals using a bench torch and rotating the glass in the flame. If this is not practicable it is possible to work with a hand torch with the glass clamped if Method... 

Big internal seals can be made by any of the methods described in the previous chapter although by far the easiest method is to work wdth the glass clamped and to keep the internal tube in one piece. 

To make the seal one of the tubes is clamped vertically and the preoxidized disc is placed centrally upon the flare of this tube. Working round the tube with a hand torch the glass is softened and the disc fused into place. With the seal still hot, the tube is removed from the clamp and, rotating by hand in a bench flame, the second glass flare... 

The ring seal at A is made in the early stages and is partially annealed. This part of the assembly is then inserted into the prepared tube B which is held clamped, and, when seated well, is itself clamped at C (Figure 62, II). Using a hand torch and exerting care to warm... 

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