"Andy Hall" wrote in message
...
On Sat, 08 Jan 2005 18:34:24 +0000, Capitol
wrote:



Andy Hall wrote:

If the manufacturers intended their meters to run as a design goal at
50% over stated capacity, they would rate them that way.
Alternatively, they would manufacture them down to the stated spec.
with much less headroom and more cheaply.

If there is overdesign on the part of the manufacturers it is for
reasons of a safety or accuracy purpose.

This doesn't sound right. In the 1970s the specification was set by the
gas boards engineers. All good engineers overspecify if they want a long
lifetime product.

If one overspecifies, it is on the basis that the product will be used
within the specification, not at 1.5 or 2x the specification.

They gave themselves a hell of a lot of slack. It could do x2 but we never
went to X2. Mdern U6s are built pretty well the same way. There is
overload built in. It just doesn't stop measuring or stop providing gas
when 212 cu ft/hr is exceeded.