General Cryogenic Pumps - General, Physical, And Functional Description

Question 1

Thermal Isolation Region

Answer 1

A regions between the warm end and cold end. It serves as a heat transfer barrier. It’s necessary to maintain proper cold end temperature and prevent freezing of lubricant in the warm end

Question 2

Sub-cooling

Answer 2

The cooling of a liquid gas below its boiling point to prevent evaporation loss and pump cavitation. This is usually accomplished by increasing the pressure of the cryogenic liquid.

Question 3

Cryogenic Pump Operating Pressure Ranges

Answer 3

Capable of pumping up to 1.6-5.2 GPM of liquid to 10,000 PSIG

Question 4

Cryogenic Pump Normal O2 Pressure

Answer 4

3000 PSIG

Question 5

Cryogenic Pump Normal N2 Pressure

Answer 5

5000 PSIG

Question 6

Cryogenic Pump Max Operating Pressure

Answer 6

Pump can discharge to 10,000 PSIG if not shut down by operator, or safety device

Question 7

Cryogenic Pump Pressure Switch PS-1

Answer 7

Shuts off cryogenic Pump if discharge pressure exceed
3200 PSI O2
5000 PSI N2

Question 8

Cryogenic Pump Relief Valve RV-2

Answer 8

Sets at
3400 PSIG O2
5200 PSIG N2
Relief pressure downstream of the cryogenic pump (overboard or to atmosphere)

Question 9

Cryogenic Pump Burst Disk BD-2

Answer 9

Burst at
6000 PSIG O2
7750 PSIG N2
Relieves pressure downstream of the cryogenic pump

Question 10

Cryogenic Pump Relief Valve RV-3

Answer 10

Set at 55 PSIG

Relieves pressure in low pressure bleed piping if the pressure exceeds 55 PSIG

Question 11

Cryogenic Pump Power Requirements

Answer 11

440 VAC
3 Phase
60 Hz

Question 12

Cryogenic Pump Lubrication Requirements

Answer 12

Splash lubricated

Question 13

Cryogenic Pump Models

Answer 13

CL-1-75
CL-1-125
CL-1A-125

Question 14

Cryogenic Pump Cylinder Assembly

Answer 14

Has a ring bleed hole for the release of excess gas generated by the vaporization of the cryogenic liquid

Question 15

Cryogenic Pump Crankshaft and Bearing Assembly (Drive end Assembly)

Answer 15

Crankshaft supported by two spherical roller bearings

Question 16

Cryogenic Pump LP Bleed Overboard

Answer 16

V-2

Vents low-pressure cryogenic liquid from the cryogenic pump to the overboard drain piping

Question 17

Cryogenic Pump LP Bleed to Tank

Answer 17

V-21

Vents low-pressure cryogenic liquid from the cryogenic pump back to the tank

Question 18

Cryogenic Pump Vaporizer Discharge Valve

Answer 18

V-4

Stops flow of gas from vaporizer

Question 19

Cryogenic Pump HP Bleed to Atmosphere

Answer 19

V-5

Vent HP gas to atmosphere