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(1) The bag-type cryogenic pump is typically installed underground, which protects it from hot air, ambient temperature fluctuations, and even motor-related heat. This design helps maintain a stable cold environment, reduces the overall installation height, increases the pressure head, and improves the effective NPSH (Net Positive Suction Head).
(2) The pump's overall structure is designed with symmetrical layout to ensure uniform deformation under cold conditions, minimizing stress concentration and improving long-term reliability.
(3) To facilitate cooling and safely transport hazardous media, the pump body is constructed with a double-shell design. The inner shell withstands the pumping pressure, while the outer shell handles the suction pressure of the medium. This arrangement can reduce the strength requirements of the inner shell, making the design more efficient and cost-effective.
(4) Pump seals:
①Seal Configuration 1 (Single-End Mechanical Seal): This configuration is simple and requires minimal auxiliary equipment. However, in the past, seal surfaces often froze or flashed during operation, affecting performance. Today, many manufacturers address this issue by using methanol or nitrogen sealing methods when the liquefied gas temperature drops below -80°C, preventing ice formation on the sealing surfaces.
â‘¡ Seal Configuration 2 (Non-Pressurized Double Mechanical Seal): This setup is ideal for long-distance pipelines where early detection of seal failure is crucial. As shown in Figure 2-129, the inner seal acts as a single-ended seal that only fills the chamber with liquid from the reservoir without pressurization. Therefore, the lubrication of the inner seal comes directly from the process medium rather than an external fluid tank. If the inner seal fails, the pressure inside the sealed chamber rises, which can be detected via a pressure gauge on the reservoir through alarms or recordings, allowing for timely intervention. The outer seal serves as the final barrier, containing any potential leakage.
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