Drainage, Waste & VentCâu 29 / 120
A 1-1/4 in trap arm serves a small lavatory. The vent is located 3 ft of developed length from the trap weir. What is the correct evaluation?
a.Acceptable, because any trap arm may run 5 ft
b.Acceptable, because 1-1/4 in arms are exempt from the length table
c.Not acceptable, because a 1-1/4 in trap arm is limited to 2-1/2 ft
d.Not acceptable, because a 1-1/4 in trap arm is limited to 2 ft
Giải thích
The maximum developed length for a 1-1/4 in trap arm is 2-1/2 ft, so a 3 ft run exceeds the limit and the arm would need to be increased in size or the vent moved closer. The 5 ft figure belongs to a 2 in arm, no size is exempt from the table, and the 2 ft value understates the actual 2-1/2 ft limit.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A 4 in horizontal drain is sized to carry a load of drainage fixture units. Which pipe run carries the greatest DFU load for a given diameter?
- A branch serves one water closet at 4 DFU, one lavatory at 1 DFU, one bathtub with shower at 2 DFU, and one kitchen sink at 2 DFU. What is the total DFU load on that branch?
- A horizontal fixture branch serves three lavatories only. Any branch that receives the discharge of a water closet must be at least what size?
- A row of five lavatories on a common horizontal branch in a public restroom is vented by a single vent connected between the last two fixture drains. What type of venting is this?
- An 8 in building drain is proposed at 1/16 in per ft over a 200 ft run. What is the fall, and is that slope permitted?
- A bathroom group is arranged so that the lavatory drain also serves as the vent for the bathtub downstream of it. What is this arrangement called, and what limits it?
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