Taylor-wharton XL-65HP (with dual regulators) Manuel d'utilisateur télécharger pdf (Page 9)

FILLING THE CONTAINER

Cryogenic liquid containers must always be filled by weight to ensure there is enough gas

head space (usage) for liquid to expand as it warms. Using the procedure below, first

determine the proper filled weight of each container. The weight derived is then used in

either the Pump Transfer of Pressure Transfer filling procedures that follow.

Determine Proper Fill Weight

1. Visually inspect the container. Do not attempt to fill containers with broken or missing

components.

2. Move the container to a filling station scale and weight it both with, and without, the fill

hose attached to determine the weight of the fill line assembly. The difference is the fill

line weight.

3. To determine the weight, at which the fill should be stopped, add desired filling weight

(from the table below), the transfer line weight, and the Tare Weight from the container’s

data plate.

FILLING WEIGHTS

XL-65 XL-65HP

ARGON 655 lb. (297 kg) 614 lb. (279 kg)

CARBON DIOXIDE N/A 516 lb. (234 kg)

NITROGEN 380 lb. (172 kg) 353 lb. (160 kg)

NITROUS OXIDE N/A 543 lb. (246 kg)

OXYGEN 539 lb. (244 kg) 505 lb. (229 kg)

Solid CO

(Dry Ice) Formation – Carbon Dioxide may form into the solid phase (dry ice)

if the pressure over the liquid is allowed to drop below 70 psig (4.8 bar/483 kPa). In carbon

dioxide service, the pressure in an XL-65HP must be maintained above this valve to en-

sure a solid block will not form inside the container. If a container is being filled with CO

it may be necessary to pressurize the container with gaseous CO

2 before

beginning the fill.

If the pressure of the container is somehow lost, the dry ice block that forms may be

thawed by pressurizing the cylinder to 280 psig (19.3 bar/1931 kPa) with carbon dioxide

gas from an external source, and allowing several day at this pressure to thaw the cylinder.

Pressure Transfer Filling Method

Filing a liquid cylinder using the pressure transfer method is common for 22 psig (1.5 bar/

152 kPa) service where the product is used for refrigerant purposes. This method may

also be used for higher pressure cylinders to increase liquid holding time. A fill is accom-

plished by first establishing a pressure difference between the source vessel and the XL-

65/65HP (higher pressure at the bulk vessel). The pressure differential will then push the

liquid from the storage vessel to the container being filled. This method is employed when

no transfer pump systems is available, or if greater control over the temperature is desired.

Filling the containers is accomplished through the LIQUID valve while the VENT valve is

open of partially open to control product pressure. Careful control of pressure will control

the amount of heat retained in the liquid. Lower pressure results in colder liquid trans-

ferred to the container and increases, or lengthens, product holding time.

NOTE:

The weight

calculation includes

the weight of residual

liquid and is

applicable to both

Pressure Transfer and

Pump Transfer filling

methods.

WARNING:

Filling operation

should take place only

in well ventilated

areas. Accumulations

of product gas can be

very dangerous (refer

to safety precautions

in the front of these

instructions). Maintain

adequate ventilation

at all times.

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Taylor-wharton XL-65HP (with dual regulators) Manuel d'utilisateur Page 9

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