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In times like this recent COVID scare...I just wish I had more confidence, and could place more trust, in those that lead.
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Plumbing / help with question from past certifying exam
« Last post by billyhealey1993 on April 21, 2020, 03:46:00 PM »
 A factory requires water to be supplied that gives a flow rate of 230 litres per minute at a pressure of 750 kPa at the outlets.
 The supply pressure is 835 kPa.
 Give the minimum diameter of the RPZD that can be installed to meet these requirements.

I know the answer is 64
but is there an equation or formula to find this out
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Fellow Practitioners Update / Fellow Practitioner Issue 394 Dated 17 April 2020
« Last post by Wal on April 17, 2020, 09:49:35 AM »
SO WHAT? WHAT IF?  Simple questions which may just help you.
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Fellow Practitioners Update / Fellow Practitioner Issue 393 Dated 5 April 2020
« Last post by Wal on April 06, 2020, 07:28:33 AM »
Its troubled times but if we follow the main directive we will survive without confusion.
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Q & A - Wetbacks / Re: Wetback noise
« Last post by Plumber on April 01, 2020, 05:46:08 PM »
Nothing is ever 100%. What im suggesting would be the most common reason for what you are describing. The valve should be visible behind the wetback, to be sure, light the fire and watch it to confirm. Also make sure the wetback is open vented (just to be safe).
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Q & A - Wetbacks / Re: Wetback noise
« Last post by Jaune on April 01, 2020, 04:49:26 PM »
Hi Plumber

Thank you for that so i assume it is normal then and doesn't pose any danger of blowing the side of my off
 
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Q & A - Wetbacks / Re: Wetback noise
« Last post by Plumber on April 01, 2020, 04:11:27 PM »
Hi Jaune,

It sounds like your wetback has a pulse valve to assist the siphon. When the valve heats up the spring is loaded, at a certain temperature there is a tipping point and the release sounds like a bang.  More details here >> http://www.pulseflow.co.nz/

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Q & A - Wetbacks / Wetback noise
« Last post by Jaune on March 29, 2020, 12:36:56 PM »
Hi all

I have a Rinnai wet back hot water cylinder connected to a Woodsman Tarras 3 wood burner
When the burner is going full steam there is a boom noise coming from either the hot water cylinder or the pipes 
Both of these are about 2 years old as they where installed when the house was built
Now I am no expert in this field but I cant imagine that this would be normal
I have attached a photo of the sticker of the hot water cylinder
Any help or advice on this would be great
Thank you
Jaune

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Plumbing / Re: ppe sources
« Last post by bowtieboy on March 28, 2020, 09:14:01 PM »
thanks macmole, i will call my local tomoprrow :)
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Plumbing / Re: ppe sources
« Last post by Macmole on March 28, 2020, 08:26:44 AM »
Mico have kits, contact your local rep or branch manager. Pretty sure they are $65+gst
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