Gasketed exchangers

There are two major types gasketed and welded-plate heat exchangers. Each shall be discussed individually. 

Copper and brasses Heat exchanger tubing, bearings, valve components, gaskets, brewing equipment... 

Because there are neither flanges, nor packed or gasketed joints inside the shell, potential leak points are eliminated, making the design suitable for higher-pressure or potentially lethal/toxic service. However, because the tube bundle carmot be removed, the shellside of the exchanger (outside the tubes) can only be cleaned by chemical means. 

Plaic-and-frame exchangers are an arrangement of gasketed, pressed metal plates aligned on carrying bars and secured between two covers by comptession bolts. The pressed metal plates are corrugated in patterns to provide increased surface area, to direct the flow in specific directions, and to promote turbulence. The plates are gasketed such that each of the... 

Figures 10-7, 10-7A, 10-7B, and 10-7C illustrate the general arrangements of most manufacturers, although several variations of plate flow pattern designs are available to accomplish specific heat transfer fluids temperature exchanges. Also, the gasket sealing varies, and some styles are seal welded (usually laser) to prevent cross-contamination. Note that Figure 10-7C has no interplate gaskets and is totally accessible on both sides, yet easy to clean.

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. 

Plate heat exchangers are limited by the necessity that the gasket be elastomeric. 

Figure 6.4a, b. Gasketed plate and frame and double pipe heat exchangers, Time base mid-2004... 

PLATE HEAT EXCHANGERS 12.12.1. Gasketed plate heat exchangers... 

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