Slam prevention in liquid pumping

Details Slam prevention in liquid pumping Slam prevention in liquid pumping

1978-03-16

1980-03-25

Freeh, William L.

Pumps

Processes

417543, 417901, 62 45, F04B 1508

Patent

active

041948700

ABSTRACT:
Conventional installations for pumping of liquid LNG (liquefied natural gas) from a sealed tank of a marine vessel to a shore installation commonly include a pump immersed in the liquid, a riser pipe from the pump to a level above the liquid, a stop valve on the riser pipe outside the tank, and a connection to the header leading to the shore installation. With the stop valve closed, operation of the pump can cause slamming of the liquid, accelerating up the riser pipe, against the stop valve, to the extent that the valve or piping may be damaged or destroyed. The invention provides a method of operation, and apparatus to permit it to be carried out, whereby a pocket of non-liquefiable gas is formed in the riser pipe above the liquid level so that, upon operation of the pump with the stop valve closed, although LNG vapor in the riser pipe may become compressed to liquid, the pocket of gas remains to act as a compressible buffer between the rising liquid and the stop valve.

REFERENCES:
patent: 1364680 (1921-01-01), Barton
patent: 1900652 (1933-03-01), Logan
patent: 2315179 (1943-03-01), Allender
patent: 3095220 (1963-06-01), Johnston et al.
patent: 3742727 (1973-07-01), Kaiser
patent: 3828565 (1974-08-01), McCabe
patent: 3868198 (1975-02-01), Purtell

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