hxr_600_n2_scf

Nitrogen inventory inside HXR600 using the HXR dimensions/specs and PDT_603_ALT data. Estimate includes the SCFs of liquid nitrogen only. Gaseous volume is not estimated, as it is the headspace at the vessel top is irregular and not possible to estimate, it is also small relative to liquid volume.

Calculation functions by dividing the HXR-600 into 3 subsections: the bottom shell, the cone section and the top shell. There are also tubes in the HXR which occupy space, so their volume is also calculated

The liquid volume in each of these sections is calculated first assuming there are no tubes. Following this, the tube volume is calculated and this volume subtracted from the total liquid volume to yield the total liquid volume. Units of this are inches3.

Total shell vol = bottom shell vol + cone vol + top shell vol

To calculate liquid volume in each section, the empty/max volume is first calculated. Then the proportion of it filled with liquid is multiplied by the empty volume to give the volume filled with N2. Proportion filled is caculated by dividing the liquid height, by the height of the subsection.

total vol in3 = Total shell vol - tube vol

The final stage is to convert the volume in inches3 to SCF

Inputs used The following heat exchager constants are used in the calculation, they vary dependent on the site

	14-002	13-007	16-006	15-008/16-005	15002	19004	20009
Bottom Shell L	6	3.875	7	4	4	7.75	7.75
Bottom Shell ID	51.25	41.5	65.25	37.375	33.5	43.375	41.375
Cone L	14.12	14.12	14.12	14	14	14	14
Top Shell L	209.19	212.19	88	211.81	212.56	216.7	216.7
Top Shell ID	57.25	47.375	71.25	43.375	43.375	49.25	47.25
Tube OD	1	1	1	1	1	1	1
HXR400 Tube No	73	73	151	73	73	81	81
HXR600 Tube No	883	508	1408	424	253	605	518

PDT_603_ALT is used to provide liquid level, it is converted from inches H2O to inches N2.