1) Above + Different spouts reflect location preferences and in some instances, the brewers choice (same with sprinklers). So in the north, it's normal to have a 'good' head on your ale, in the south, it's normal to have no head as such, hence the need for the different spouts. Angram even list them as northern and southern spouts
http://www.angramltd.com/products/spare ... cessories/
2) Above + Angram pumps both dispense and refill on the same stroke, therefore after the 1/4 or 1/2 pint cylinder has been purged, it's also refilled, therefore in a warm pub, with a product line that doesn't sell that well, it's quite possible to have either 1/4 or 1/2 of ale that could soon reach room temperature, so the purpose of the cooling jacket, is to ensure that the ale left in the cylinder is kept to the correct temperature. Likeswise in a busy pub it may be an idea to add an additional chill to the ale, before it gets dispensed, especially if it has a long journey from the cellar.
3) Above
4) Million dollar question - Most pubs do this once a week at least, some two times a week, some flush the lines every night with water. The answer is how much loss can you take, as everytime you clean the lines, pull a fresh pint, you loose product.
I would only consider using my beer engines at a party, as I simply don't drink enough in a week, to warrant the losses and cleaning i.e as I've said, with an Angram engine, there's always a full charge in the cylinder at anyone time. Some of the other pumps Worthside etc, fill on the back stroke, so you can limit losses by not pushing the handle back.
There is something special about dispensing with a Beer Engine but the reality is they are designed for commercial use, as such, using them for home/limited dispensing has to have it's trade offs, the big one being, loss of product i.e to purge/clean a 1/2 pint pump, could take 2 to 3 pumps, which is a 1.5 of lost beer. I have 1/4 cylinders for that reason, even then, it's still 3/4 of a pint potentially per cleaning cycle, which is a fair amount of loss/waste for the 5 to 8 pints, I'd actually be drinking, in that week.
Parties are another matter as a good beer on a BBQ night, can literally be gone in 60 seconds
