risers and flues met.

[Tasha_Int]

Пожалуйста, помогите перевести, risers и flues. Flues - каналы?
Речь идет о футеровке коксовых батарей:
Выражение встречается в следующем контексте:
At oven sole the expansion is ranked at 5:
when expansion is such that the risers for the last 6 flues are severely compromised or inoperable
• At oven top and mid oven level the expansion is ranked at 5:
when the visibility from the inspection port to the riser is obscured
• At gallery level the expansion is ranked at 5:
when the refractory riser is misaligned with the pad riser penetration

Заранее спасибо

[vas_dem]

стояки и борова