THREAD SIZES - ROLLOVER VALVES AND THE ADJUSTABLE CONEJET

THREAD SIZES - ROLLOVER VALVES AND THE ADJUSTABLE CONEJET

THREADS (SKROEFDRADE) NPT, NPS, BSPT, BSPP

Let's clear up the issue of thread sizes; well at least these. Not everyone in the world has gone metric and it is unlikely that all countries will change even in decades to come.

Here we have an image of a rollover valve with slotted strainer, ceramic nozzle-tips and cap. Take note of the parallel inlet thread with lock nut.

This image shows a rollover valve with male inlet thread and a male hexagonal barrel nipple.

The inlet thread of the rollover is parallel (BSPP) while that of the nipple is tapered (BSPT).

BSPP = BRITISH STANDARD PARALLEL PIPE thread.

BSPT = BRITISH STANDARD PIPE TAPERED thread.

BSP or British Standard Pipe are standards in UK, (not much of a united kingdom anymore), Europe, Australia, New Zealand and South Africa.

And finally the Adjustable Conejet or "Superjet" as some refer to it with its external 1/2" (NPT) and internal 1/4" female (NPT) thread. 

NPT = NATIONAL PIPE TAPER thread. NPT is an American "standard". 

This unit is not manufactured with BSP threads!

You may also come across NPS -NATIONAL PIPE STRAIGHT thread which is the STRAIGHT or parallel form of the National Pipe Taper thread. Refer to page 70 in the Teejet 51A - M catalogue.

So! What's the difference? Quite simply the there is a slight difference in the shape of the thread. The pitch or number of threads per inch are the same.

Next post : UNIFIED NATIONAL - capnut thread.

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TREE CROPS - MACADAMIAS, CITRUS, PECANS - From litres per hectare to litres per minute.

As explained in the previous post, spreadsheets can't be inserted or attached. Here's the link showing calibration and determining the volume per planted hectare using a set of existing nozzles. 

http://chemiconsa.blogspot.com/2014/10/nut-and-fruit-trees-mist-blower.html  

The image below is the print out of the spreadsheet covering the mistblower calibration starting off with a pre-determined volume per planted hectare.  You still have to enter the data to determine speed and inter-row spacing.  Just send an email to chemiconteejet@gmail.com and I'll send you the files. 

In my opinion, this is the correct way to undertake spray-applications.  The problem is that farmers are sold spray-rigs with an ex-works set of nozzles which are suitable for spraying Olives, Vines, Apples and Pears etc.  They eventually discover that this is not a plug and play unit especially when it can't cope with big trees. 

Once you have the spreadsheet you fill in the essential data as marked with **. Nozzle tip flow rates are taken from the suppliers information.

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NUT AND FRUIT TREES - MIST BLOWER CALIBRATION SPREAD SHEET

Greetings!

The weblog does not allow a spread sheet file to be inserted or attached.  If you need the spread sheet please email  chemiconteejet@gmail.com  and I'll send the file.

Here's the print out of the file.  The data entered is merely for illustrative purposes.  

Remember this calibration uses an existing nozzle-tip configuration. I will be presenting the calibration exercise IN FUTURE  starting off with a given spray-volume per planted hectare or litres per tree and then calculating the total nozzle-tip volume in litres per minute.  A nozzle-tip configuration then has to be worked out to match the total output. Simple.

DO YOU KNOW WHAT NOZZLE-TIPS YOU HAVE IN YOUR SPRAYER?  HAVE YOU GOT THE SPECIFICATIONS OF THE TIPS AT VARIOUS PRESSURES?  DO YOU KNOW HOW TO CALCULATE THE FLOW RATE AT PRESSURES NOT SPECIFIED?  I HAVE DISCUSSED THIS ASPECT IN PREVIOUS POSTINGS.  GOOD SEARCHING. 

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