Why such a huge pressure drop in gas to boiler

[Gary80gas]

Just fitted a Worcester 38cdi. Ive run 15m of 28mm with 9 bends and im getting a 5mb drop from the meter to the boiler. Ive connected to a 22mm union on the meter and stepped up to 28mm, then used a Worcester own top feed kit to feed pipes behind boiler which is about 1.5m of 22mm.
Is my maths wrong. Is it the meter union or the Worcester behind boiler kit.
Any ideas appreciated. Ta.

 

[Scott_D]

Could do it just above if you have used the premade pipe kit
Would be akward to get it below the boiler

 

[sammathias]

You didn't use a full reel of solder installing the gas pipe did you?

 

[Gary80gas]

I always run plenty of solder but not that much. I'm fitting the test with a compression tee under boiler hope it fits the pre-plumb kit. I had to a bit of a run around visiting several merchants to get the right fittings.

 

[Gary80gas]

Cutting the test tee into Worcester's premade boiler connections below the boiler was relatively easy, just removed gas control and squeezed it in. I disconnected the pipework first both ends and connected a hoover, cant tell what it pulled out, probably loft insulation, wood chip and spiders but the pressure drop is down to 0.75mb, so happy days. Thanks.

 

[sammathias]

Glad you sorted it. What was it reading on gas valve after you cleaned pipework out?

 

[jtsplumbing]

Its about time Boiler manufactures started fitting test points for this reason

 

[Harvest Fields]

Its about time Boiler manufactures started fitting test points for this reason

Would be nice mate but cannot see it happening to be honest.