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Armstrong Chemtec has built over 4,500 vertical bayonet vaporizers for a wide ranging catalog of process fluids, with over 1,000 vaporizers in chlorine service. Some of the more common applications are: Armstrong Chemtec manufactures vertical bayonet vaporizers using carbon steel, stainless steels, and high nickel alloys. The unique bayonet (tube in tube) construction, developed by Armstrong Chemtec, produces a number of advantages over other types of vaporizing equipment: Freeze Protection. Incoming steam (or other heating fluid) continuously heats outgoing condensate.

Vertical equipment occupies significantly less plot space than horizontal options. The retained liquid volume is much smaller than alternative designs. The vaporization rate and liquid level are self regulating with downstream demand. Thermal stress is eliminated because tubes are only fixed at one end. The tube bundle can be inspected and replaced easily in the field. Armstrong Chemtec is the preferred vertical vaporizer supplier for multiple licensed refinery processes. Get in touch with our team to discuss your process heat transfer needs.

Be prepared for any instances of product wear and tear by investing in spare parts. Armstrong Chemtec Group helps prevent costly downtime by manufacturing additional parts that you may need in the future. Shells 24 in (610 mm) and below are made of SA-106 Gr.B pipe. Larger shells are welded of steel plate of SA-516 Gr.70 normally. Tubesheets are normally of SA-516 Gr.70 material, but are also available in stainlesses, nickel alloys, Hastelloy, etc. Standard design of size “A” and “B” units may not have a removable tube bundle. Tubes are normally 1 in (25.4 mm) V-8 Vaporizers; Vaporizer Applications. (Source: Armstrong Engineering Associates.) TABLE V-2 Comparison of American, British, German, and Japanese Material. Top ends of tubes are securely welded shut on all units. Tubes on sizes A and B normally have external longitudinal fins in contact with liquid being vaporized, multiplying the external surface about eight times, but can also be supplied with bare internal heating tubes. Tubes are welded to the tubesheet and then rolled and expanded for additional holding power. Rolled joints alone are not sufficient for extended periods of service. For special services, these tubes can be of steel, stainless steel, or other materials. Bayonet tubes are roller expanded into lower tube plate. TABLE V-3 Approximate Dimensions* (for Steam-Heated Vessels) (Dimensions Are in Millimeters) * Dimensions and outlet sizes may be varied to suit individual job conditions. NOTE: Outlets with screwed connections also available upon request (at lower cost). On the process side, normally 250 psi (17.6 kg/cm 2 ). In steam or hot water space, 100 psi (7 kg/cm 2 ) (higher pressures available if needed). are designed, inspected, and National Board stamped in accordance with the ASME Code. may be supplied per ASME, TUV, Stoomwezen or other local codes as required. When operating pressure goes below 25 psi on propane or butane, check with the factory to avoid difficulty from pressure drop through nozzles. (25.4 mm) ¥ 0.083 in (2.1 mm) wall tubes, seal-welded and rolled, give more clearance for condensate and steam. Thicker tube used in design adds to the life of the bundle.

The seal-welding, and rolling gives strength needed against the fairly rapid variations in pressure and temperature encountered under some conditions. To avoid a loss of process fluid through leakage (and the peril of a potential explosion), the OEM seal-welds the tubes to the tubesheet. Since the tubes are only secured at the bottom end, there is no tendency for the tubes to flex or twist from temperature stress. This is a marked advantage over units with tubesheets at both ends, where repeated temperature stress may cause failure at the tube end. V-17 Four typical vertical vaporizers for large Mideastern refiner. Note the inlet belts on three of the vaporizers, often used to improve shell side distribution for improved boiling and excessive tube impingement. (Source: Armstrong Engineering Associates.) Bottom steam feed protects against freezeup.

The condensate is constantly warmed by incoming hot steam or hot water (if that is the heating medium). Even though the vaporizing temperature in the shell falls below freezing temperature, the condensate does not run the risk of freezing with consequent bursting of a tube. For boiling below 25°F ( - 4°C), consult the information source. The tube bundle is removable and can be replaced in the field.

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