Bar-top boxes for Top-Pressure dispense |
In my previous and rather lengthy article about
cask-conditioning, I touched upon the limited shelf life of cask ale. I also
mentioned how careless handling and disgusting practices, such as returning
“slops” to a cask, had led brewers to look at ways to improve and maintain the
quality of the beer, as served to the customer in his or her glass.
The development of “keg” beers, filtered, pasteurised and
then stored in sealed containers, and dispensed, under pressure, using
carbon-dioxide gas, was one solution, but it was expensive. The equipment
needed for processes such as filtration and pasteurisation was not cheap, so
brewers looked at an alternative “half-way house” solution in the form of “Top
Pressure” systems.
Top Pressure dispense systems undeniably improved the
keeping qualities of cask beer, and extended its shelf life. It stands to
reason that if oxygen is excluded from the cask, then the contents will last
longer, as oxidation cannot take place so, to many brewers and publicans,
top-pressure seemed like the answer to a maiden’s prayer.
As above |
There was a downside however, as in order to force the beer
from the cask and up to the taps on the bar, it was necessary to apply an
appreciable amount of pressure. If there was a long pipe run from the cellar to
the bar, a considerable amount of pressure was necessary in order to dispense
the beer and due to some of the CO2 being absorbed and dissolving in the beer,
this had the unfortunate side effect of making the beer fizzy. In the worst
cases, the beer absorbed so much CO2 that it resembled keg, rather than cask
beer.
When I started drinking in the early 1970’s (not at a legal
age to begin with), top-pressure dispense was pretty much the norm; in fact
seeing hand-pumps on the bar, and especially ones still in use, was quite a
rare sight, apart from in Shepherd Neame pubs, and my friends and I tended to
avoid those anyway.
CAMRA too in those days, viewed pressurised dispense with as
much disdain as it had for keg beer, as a look through the Brewery Section at
the rear of the 1974 GBG reveals. Many of the pub descriptions in the main part
also specifically refer to “pressure”, or the absence of it. The Guide goes out
of its way to point out that “There is always a very high risk that the beer
will become gassy, sickly and sweet it carbon dioxide is re-introduced
artificially”. I understand the bit about the beer becoming gassy, but
sickly? And as for sweet, well CO2 obviously possesses magical properties,
hitherto unknown to chemists!
One could therefore be forgiven for thinking that
top-pressure was an inherently bad system, and yet it was brought in by
breweries to address a major concern regarding the poor quality of much cask
beer. The brewers argued that as carbon-dioxide is a natural by-product of
fermentation, its use as both a means of dispense, and in providing a
protective “blanket” over the beer, should be considered beneficial. One could
see their point, and almost sympathise, especially as they were trying to solve
a problem which had dogged cask beer for many years.
The point about providing a blanket was taken further by a
number of breweries in a hybrid system known as “blanket pressure”. Here, CO2
under low pressure was applied to the top of the cask, via the spile hole, in a
similar manner to that of normal top-pressure systems. The pressure of gas was
kept deliberately low, so as to just provide a layer of protection to keep air
away from the exposed surface of the beer. Dispense would then be achieved by
normal hand or electric pumps, or even by gravity.
Cask-Breather |
The so-called “Cask-Breather” was a device specifically
designed to circumvent these alleged problems. Cask-breathers are, in effect,
demand valves, which work on similar principles to the aqualung, used all over
the world by divers; although the former operate at lower pressures. The
principle is that as beer is drawn off from the cask, the inside pressure
falls. Instead of drawing in air, the “breather" allows sufficient CO2 to enter
the cask to fill the volume created. The beauty of it is that only just enough
gas is admitted, so there is no chance of excess CO2 being absorbed by the
beer.
How the thing works |
Despite the device having been evaluated and approved by
CAMRA’s Technical Committee, with an irrationality based solely on a rabid
aversion to the dreaded “extraneous CO2”, the Campaign as a whole said “no”.
The chance to improve the quality and longevity of cask beer was therefore lost
due to the rigid dogma of a handful of “stick-in-the-mud”, diehard activists.
Not that this opposition stopped brewers and publicans alike installing
cask-breathers in their cellars; a move which didn’t go un-noticed by CAMRA
purists, and which led to an insistence of the right to inspect pub cellars,
when surveying entries for the Good Beer Guide.
This confrontational approach obviously upset a lot of
people in the trade, and did little to enhance the standing of CAMRA as a
responsible and professional organisation. The cask-breather debacle also
marked the beginning of my long-standing disillusionment with the Campaign, and
this insistence on cellar inspections was one of the key reasons why I no
longer have anything to do with the Good Beer Guide.
Looking back, I can understand why brewers opted for the
top-pressure system as a means of improving the keeping qualities of cask beer,
but was CAMRA right in opposing it? Probably yes, due to the risks of altering
the mouth-feel and drinkability of the beer due to the absorption of too much
CO2. As for blanket pressure, I don’t really know. What I do know though is
that had devices such as cask-breathers been around in the late 1960’s-early
1970’s, then top-pressure systems would have been unnecessary, and cask ale
could have continued pretty much as it was, without the need to switch over
entirely to keg.
Cask-breathers in use |
In my book, the brewers were definitely right to look for
ways of extending the life of cask beer by preventing oxidation, for this is
the Achilles Heel of “real ale”. All is well if a cask is emptied within a
two to three day period, but as we all know to our cost; this is often not the
case. Many pubs are far too ambitious in the number and types of cask beer they
stock, leading to a slow turn-over, especially of the less popular beers or
brands. Right from the start, CAMRA did recognise the inherent limited
shelf-life problems associated with cask beer; that first commercial,
pioneering Good Beer Guide which appeared in 1974 had a few lines in the
introduction which read, “Another feature of real ale that you ought to
welcome is that it can vary from superb to undrinkable; even in the same pub.
Every brew has its good days, its bad days and its indifferent days. Learn to
accept the off moment and revel in the times when you hit on a really excellent
pint”. (I don’t know about you, but I’d be very wary of a pub where the
beer was excellent one day, and undrinkable the next! Surely a case of someone
not knowing what they are doing?)
The frustrating, and indeed annoying thing is that when a
solution to this problem appeared in the form of the cask-breather, because of
the influence of a small group of vociferous, die-hard activists, CAMRA chose
to turn its back on it. For purely doctrinal reasons associated with past
negative experiences of top-pressure, the Campaign went into overdrive in its
opposition to this “beer saving” device. These reasons flew in the face of
scientific facts and demonstrably repeatable tests which proved, beyond all
doubt, that cask breathers had no adverse effect whatsoever on the beer.
Mind you if Carbon Dioxide really can make a beer taste
sickly and sweet, then perhaps anything is possible and cask-breathers are the
work of the Devil and the very end of civilisation as we know it!
Footnote: I wrote a similar post to this one, back in April 2014, highlighting the lunacy of CAMRA's opposition to cask breathers. You can read it here.