On Fri, 30 Apr 2021 11:54:54 +0100, Max Demian <
max_d...@bigfoot.com>
wrote:
Once started the furnace runs continuously, but unless they are very
busy and doing a large number of committals in a short space of time
they generally do the cremation immediately following the committal.
The actual cremation itself takes about 75 to 90 minutes, depending on
the size of the body, so if the crematorium is fully booked for that day
then a queue of committed bodies will form as a typical service is
around 40 to 60 minutes. In that case, the furnace won't finish running
until some time after the last committal. But most of the time, there's
enough slack in the schedule to allow each cremation to immediately
follow the committal.
The furnace doesn't run at a constant temperature; it's first pre-heated
before any cremations are done, then after a coffin is inserted it goes
through a cycle of increasing temperatures up to the main operating
temperature, and then allowed to cool back to pre-heat levels once the
cremation is complete and the ashes have been removed. It will be
maintained at the pre-heat level while unoccupied all day, even if
cremations don't immediately follow each other.
These days, it's all computerised - the weight and dimensions of the
deceased are typed into the system and the total burn time calculated
accordingly. The only thing the staff have to do is press "start" -
everything else follows automatically. But it still has to be observed
throughout, just in case something happens that hasn't been allowed for
in the calculations (such as people smuggling forbidden items into the
coffin of the deceased, which can affect the cremation time), so if
necessary the staff can adjust the temperature, the airflow and the time
manually to respond to these.
Some religions insist, or at least prefer, that the actual cremation
itself is witnessed, and it's not unusual to get such a request even
from non-religious families. So most crematoria have a facility for
allowing a small number of witnesses (usually just close family) to go
backstage, so to speak, and observe the coffin being placed into the
furnace and the gas burners started. The door to the furnace is not
closed until those present can observe the coffin starting to burn.
(All of the above learned on an incredibly interesting VIP visit to the
official opening of a new crematorum near where I live, in the course of
which we were given a full behind-the-scenes tour and a detailed
explanation of how it all works).
Mark