Hydrocarbon Processing - July 2021 - 41

Plant Design, Engineering and Construction
FIG. 5. Manhole one-pass tray (A), options for manhole locations in a two-pass tray (B), a hand hole at the bottom of a packed bed (C) and
a hand hole at the top of a packed bed (D).
Fixing the orientation of a manhole in
chimney trays and high-quality distributor
locations is tricky work. It must be ensured
that no chimney riser of a liquid distributor
trough is blocking the entry passage.
Hand holes. Hand holes (FIGS. 5C and
5D) are provided mostly in randomly
packed towers and are used for either topping
up of random packing or removal of
packing. Recommended hand hole sizes
range from 150 mm-250 mm, depending
on column diameter and packing size.
For packing removal, hand holes should
have a minimum 25-mm gap between
the top of the packing support plate and
the hand hole inner diameter. Similarly,
for topping up of packing, the location
should be 25 mm below the bed limiter
from the top of the hand hole inner diameter,
as shown in FIG. 5D.
Pressure and temperature connections.
Pressure measurement connections
(FIG. 6) are always provided in
the vapor phase, as most of the pressure
measurement instruments work in single
phase. The nozzles for pressure measurement
are recommended below the active
tray area with a minimum gap of 100 mm.
Temperature measuring nozzles are
normally provided in the liquid zone due
to better heat transfer in the liquid phase.
The recommended practice is to provide
these nozzles 50 mm above the respective
tray. In the case of bubble cap trays, the
thermowell is suitably located so it does
not clash with the bubble cap.
A thermowell can also be provided in
the downcomer area as shown, depending
on the available width in the downcomer.
FIG. 8. Partial withdrawal from the tray (A), partial withdrawal from the bottom seal pan (B) and
total product withdrawal from the chimney tray (C).
Hydrocarbon Processing | JULY 2021 41
FIG. 6. Pressure and temperature tapping locations in a one-pass tray (A), and pressure and
temperature tapping locations in a two-pass tray (B).
FIG. 7. Safety valve locations options 1 (A), 2 (B) and three (C).

Hydrocarbon Processing - July 2021

Table of Contents for the Digital Edition of Hydrocarbon Processing - July 2021

Hydrocarbon Processing - July 2021 - Intro
Hydrocarbon Processing - July 2021 - Cover1
Hydrocarbon Processing - July 2021 - Cover2
Hydrocarbon Processing - July 2021 - 3
Hydrocarbon Processing - July 2021 - 4
Hydrocarbon Processing - July 2021 - 5
Hydrocarbon Processing - July 2021 - 6
Hydrocarbon Processing - July 2021 - 7
Hydrocarbon Processing - July 2021 - 8
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Hydrocarbon Processing - July 2021 - 26
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Hydrocarbon Processing - July 2021 - 30
Hydrocarbon Processing - July 2021 - 31
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Hydrocarbon Processing - July 2021 - 33
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Hydrocarbon Processing - July 2021 - 38
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Hydrocarbon Processing - July 2021 - 40
Hydrocarbon Processing - July 2021 - 41
Hydrocarbon Processing - July 2021 - 42
Hydrocarbon Processing - July 2021 - 43
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Hydrocarbon Processing - July 2021 - 90
Hydrocarbon Processing - July 2021 - Cover3
Hydrocarbon Processing - July 2021 - Cover4
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https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020_v2
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201909
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201811
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201810
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201809
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201801
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201712
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201612
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201611
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