“snw65-iii, with these letters, almost dragged the entire building into the fire。
Last week, at a level-a building in hangzhou, the fire brigade blew the a side into place in one sentence: the embolism pressure 0. 72 mpa, overpressure 0. 02, but did not find a qualified pressure-reducing steady pressure button。
The drawings only write “by national standards”, and the purchases are customarily placed, resulting in 300 ordinary emboldens being scrapped, back-to-work costs of $470,000 and periods of work being delayed for 20 days。
It's not a story, it's a real "repeated star" in a random check in the fourth quarter of 2023。
A lot of people think that the embolism is just a "water out," but the reality is that the pressure is low and the water column is not enough for 13 floors; the pressure is high, the 19-year-old girl can't hold it alone, turns into a "high-pressure water gun" for one second, and people don't flush themselves down the stairs。
Gb 50974-2014 writes clearly:
0. 25-0. 5 mpa is a safe zone
(b) pressure-relief devices, exceeding 0. 7 mpa, shall be required
The top of the "high eight" class will start with 0. 35 mpa。
It sounds like high-school physics, but there's no one on the scene who's going to count bernouli equations, and even if there's a line in the design note, the procurement can only guess the model。
What the hell is snw65-iii
In short, it carries its own spring piston, enters the water 0. 4-0. 8 mpa, comes out steady at 0. 35 mpa and is not afraid to go crazy in the middle of the night。
However, in may 2023 gb/t 3445-2022 was upgraded by adding a new iv type for over 250 m of "cloudy houses", importing 1. 6-2. 5 mpa and also locking exports to 0. 4-0. 5 mpa。
The old drawings were not updated, and the construction party filed the same order, resulting in the site — “the model expired, please return to the oven”。
Even more embarrassing was the fact that last year, shanghai's silent industrial unit used 200 snw65-iii, which was accepted with 1. 4 mpa constant pressure, and less than 30 minutes with seven seals directly "puzzled."。
As a result of the sample report, the plant recognized that the average charge balance was only 20 per cent, which was triggered by the pump house impact and the edge seconds became "flooding."。
The department of emergency management simply patches up: the stress-ridden plant, buys a booster directly, the pressure test reaches 30 minutes, save the 8% difference。
Some began to wonder: "can we put the smart plug in one step?"
Shenzhen nanshan has been piloted: a pressure sensor is inserted in the embolism, data is uploaded in two minutes, 0. 01 mpa fluctuations are giving you little credit。
The white paper states that, in the past, manual inspections were conducted, with an abnormal average of 72 hours of exposure; now, the security guard on duty rushes through the cell phone after a shock, faster than the flame itself。
There are also disadvantages -- expensive, $260 more expensive than normal, and it hurts when the a side listens to "hundreds of dollars for a sensor" and goes back to work, $470,000, and suddenly it feels like it's real。
So don't use "select" as a form game:
Under 100 m, snw65-i sufficient
(b) upper and lower levels, with direct third-type start-up
Once the height of the building is broken 250 m, make sure that the drawings are changed to iv and don't let the old rules slow you down
The scenes of the “pumping room's temperament” at the plant, the warehouse, were directly enhanced and the acceptance was not allowed to suffer for half an hour。
I'll leave you with a little homework:
Do you still have a project drawing that says, "put the embolism on gb 50974 for execution"
If you have time to flip it out, is the model bar empty
Empty is a mine. Don't blame the code for being too “corrupt”。
