S*A
发帖数: 7142 | 1 这个图转了 90 度。注意里面有个 cross over 但是没有十字接头。 |
|
|
|
z*********n
发帖数: 94654 | 4 多谢多谢
最角上那四个压力会不会较小？不过比较平均估计没事 |
|
|
S*A
发帖数: 7142 | 6 这个已经非常平摊压力了，4 个角压力是对等的。
如果角上压力不够说明你不能用一个 Zone。
你如果压力不一样的话出水也容易不均匀，不好。 |
|
|
|
|
S*A
发帖数: 7142 | 10 FT, 刚才折磨画图的东西，没有看到。
似乎最好的策略是先收了你的 200 包子，然后叫张老三出包子来抵消你的
200 包子。然后私下给张老三。哈哈。 |
|
S*A
发帖数: 7142 | 11 对，可以用两个 135 度的接一下拐出个高度差来。 |
|
z*********n
发帖数: 94654 | 12 对了，沟要挖多深？sprinkler的head高度基本都固定的对吧 |
|
S*A
发帖数: 7142 | 13 是但是最好不要直接 cross over, 你不希望泥土压力吧两水管挤到一起。
用两 135的弯拐一下最好。 135 没有什么压力损失。 |
|
g*********o
发帖数: 20357 | 14 要那么麻烦么，pvc弹性这么大，距离长点完出个小小的弧度不是挺容易的吗 |
|
|
S*A
发帖数: 7142 | 16 8 - 10 inch. 12 inch 最好。
这样你挖东西不容易挖烂水管。要用 sch 40 的 PVP. 不要用那种超级软的。
最好用 6 inch pop up. 我以前给你列过清单的。 |
|
|
z*********n
发帖数: 94654 | 18 上次是远期计划，这次是真动手了，哈哈
比如我埋12inch深，head的脖子要多长？都是固定标准长度的吗？ |
|
S*A
发帖数: 7142 | 19 另外一个简化的图，用了一个十字接口。但是十字的下级只有一个喷头，
带不了很多水流，估计问题不大。
那个要有个 swing raiser. 不能直接接在 T 头上的。直接接在 T 头
上踩到喷头就直接传压力到水管上了。例如汽车轮胎压到前院的草坪还是
有可能出现的。 |
|
z*********n
发帖数: 94654 | 20 没具体见过sprinkler的head，是不是高度可以调整？ |
|
|
|
|
z*********n
发帖数: 94654 | 24 不知道，山寨地回答，挺猛的，lol
没买测压表 |
|
S*A
发帖数: 7142 | 25 水压和水流量都要量一下的。我记得你以前是计划 4 个头，
不如这个均匀。喷头头多了大概要算算是不是够力的只用 1 个 zone。 |
|
S*A
发帖数: 7142 | 26 swing raiser 可以调节角度和位置。当然 swing raiser arm 也可换长度。 |
|
z*********n
发帖数: 94654 | 27 9个要多大水压？不行我明天买个测的测测
两个zone也没多大关系 |
|
|
S*A
发帖数: 7142 | 29 喷头哪里是要 30 psi 以上。主要是你接口的流量要够大。
你的压力可以很高，但是流量不大的话就意味着有点流量压力就
下降非常快。所以两个都要量一下。
$9 HD 量压力的，很值了。 |
|
|
S*A
发帖数: 7142 | 31 这个是看喷头，和 pop up 是两个东西。
很多喷头是可以调整角度的，例如我推荐那个 mp rotator.
但是距离调整的余地不是很大。 10% - 20%. |
|
|
S*A
发帖数: 7142 | 33 五个没法覆盖均匀的。要么 4 个要么 9 个。 9 个比较好。 |
|
z*********n
发帖数: 94654 | 34 那我用多长喷射距离的head？10-15 ft？岂不是很小的head? |
|
S*A
发帖数: 7142 | 35 I think the MP 1000 covers 8 - 15ft. 应该正好。 |
|
S*A
发帖数: 7142 | 36 BTW, 你边角要覆盖得好的话需要 overshoot 大概至少 1 feet 的。
所以有些余量好。 |
|
D*******1
发帖数: 11303 | 37 5 is probably not enough, but have you thought about 8, without the center
one? I think the coverage should be pretty good. If it works, it will save
lot of digging and pipping. |
|
S*A
发帖数: 7142 | 38 Why without the centre one? That is not head to head coverage any more.
Truest me, you are going to have uneven water coverage. It is pretty
much the same as square only using 3 heads. Plus, it is not going to
save you digging work any way, because you can't just run the pipe
in a serial line. That is the worse design in regarding water pressure
and flow distribution. |
|
|
S*A
发帖数: 7142 | 40 I am pretty sure I said 6 inches pop up. He mean only using
3 heads, not 3 inch pop up. |
|
z*********n
发帖数: 94654 | 41 我想起来你说的6 inch了，说实话昨天听你说的时候没概念不知道你说的啥意思
现在回想明白了，呵呵
那就是用个短点的riser, 6inch的popup head对吧
为啥要那么高呢？ 3inch的有啥不好？ |
|
D*******1
发帖数: 11303 | 42 I am learning here. I was thinkging about a serial line, but didn't realize
the water pressure and flow issue you mentioned. WOnder how bad it can be.
I still think the coverage should be OK although it is not head to head for
the center. If oyu use 15 heads, the certer should be covered very well.
Apparently I am not a person paying much attention to details :-) |
|
S*A
发帖数: 7142 | 43 3 inch will block by grass once your grass is 3 inch high. Over the
years the lawn has thatch so effective the grass will raise up.
For the record I mow at 3.5 inch now I am still waiting my grass
grow a little bit higher.
No, the riser need to be at least 6 inch, yes it add up more than
8 inch you are digging. That is the swing arm come into play.
Using the swing raiser, you can have some flexible range (a few inch)
to position your head, instead of fixing it on one spot. |
|
|
z*********n
发帖数: 94654 | 45 再问一个，我家的管道是1/2的，我买的3/4， schedule 40的pvc管子
然后head大多是1/2的thread，这个组合没啥问题吧
各种组合的接头倒是都买到了 |
|
|
S*A
发帖数: 7142 | 47 FT. You really need to read the tutor first.
There is some video to get some sense in case reading tutor is too
boring.
http://www.orbitonline.com/support/videos/category.cfm?VideoCat
Come up with a plan before you buy stuff and dig. You did not
mention 1/2 inch before, and you did not measure the flow rate.
I think if you use 1/2 it is very likely you can't do it with
1 zone.
BTW, I forget. You suppose to call some number before you dig.
Ask them to mark the gas line etc so you don't dig throug... 阅读全帖 |
|
z*********n
发帖数: 94654 | 48 hmmm，我的water bill上写着是3/4，我说是1/2，是因为我爸“目测“说看我家的管道
比那个pvc细，lol，这个在不拆掉faucet前如何确定呢？
water bill上的3/4是接入点的直径，在我做水源的那个faucet处应该是一样的吧
那个tutor，几个月前通读过一次，考虑到我这地方比较小设计比较简单，所以没做太
多设计。 |
|
z*********n
发帖数: 94654 | 49 btw, 根据tutorial
http://www.irrigationtutorials.com/sprinkler09.htm
选择比home mailine相同型号或者大一号是正确做法，good start point
QUOTE:
As previously stated, you need to start with an educated guess for the
irrigation mainline size. Almost always the irrigation mainline will need to
be the same size or larger as the house mainline, so that is one good place
to start. Even better, start with one size larger than the house mainline
as in most cases this will be needed, especially if your Design Pressure is
less ... 阅读全帖 |
|
|
