Orifice Flow Control

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Orifice Flow Control

Orifice Flow Control of Pipeline Shielding Gas Mounting an orifice at the pipeline gas drop (unlike mounting it at a wire feeder) is a good method of setting shielding gas flow rate. It also works great when used with our **Gas Saver System (GSS). Using the GSS will eliminate excess start gas surge improving weld quality and saving 35 to over 60% of your shielding gas usage! Desired gas flow rate is established by selecting the proper orifice size. If the pipeline pressure is 30 psi or higher the flow will remain constant regardless of inevitable flow restrictions that occur while welding (See “Automatic Flow Compensation.”) Selecting orifice size is based on pipeline pressure and the type of gas. To optimize orifice size selection we have developed a system where one of ten "Orifice Inserts" can be easily changed if or when needed.**

Our "Orifice Assembly" is designed to be installed at the pipeline after any OSHA required shut off. The inlet has a ¼ inch Male NPT (National Pipe Tread) and incorporates a large area conical porous bronze filter (Photo Left.) The filter keeps debris from clogging the orifice. The other end of the “Orifice Assembly” (Center Photo) has access to the Orifice Insert. Photo Right shows the "Orifice Insert" removed (White Arrow) along with the threaded "Orifice Insert Retainer" (Yellow Arrow). The retainer can be removed with an Allen wrench and the Replaceable Orifice Insert changed to alter flow.

The standard Orifice Assembly comes with a # 35SO Orifice Insert. That assembly is part number WAT 35AO. Shielding gas flow rate depends on the pipeline pressure per the following table:
Pipeline Pressure psi	Argon/ CO₂ _Mixtures	Straight CO₂
30	30 CFH	29 CFH
35	33 CFH	32 CFH
40	35 CFH	34 CFH
45	40 CFH	38 CFH
50	43 CFH	41 CFH
55	45 CFH	44 CFH
60	50 CFH	48 CFH

The "Orifice Assembly" can be purchased with one of the 10 optional "Orifice inserts" installed. Each comes with a table showing the specific flow with pressures ranging from 30 to (for most) 60 psi pipeline pressure in 5 psi increments. The following table shows the range of flow for 30, 40 and 50 psi pipeline pressures for Argon based shielding gases (for Straight CO₂ subtract about 2 CFH):
Orifice Assembly Part #	Flow @ 30 psi Pipeline Pressure	Flow @ 40 psi Pipeline Pressure	Flow @ 50 psi Pipeline Pressure
WAT 35AO (Standard)	30 CFH	35 CFH	43 CFH
WAT 38AO	31 CFH	38 CFH	45 CFH
WAT 41AO	33 CFH	41 CFH	48 CFH
WAT 45AO	37 CFH	45 CFH	54 CFH
WAT 48AO	40 CFH	48 CFH	57 CFH
WAT 51AO	42 CFH	51 CFH	61 CFH
WAT 54AO	44 CFH	54 CFH	65 CFH
WAT 57AO	46 CFH	57 CFH	-
WAT 60AO	49 CFH	60 CFH	-
WAT 63AO	51 CFH	63 CFH	-
WAT 66AO	54 CFH	66 CFH	-

Payment Method We accept most credit cards and use a secure transaction by PayPal. Only their site has access to your information. You do not have to join PayPal, just use your credit card as a one time transaction. Select the item then click ADD TO CART BUTTON. You can add the quantity desired in the SHOPPING CART. You can return to add more items or cancel the purchase at any time.
Purchase Orifice Assembly
Description	Part # WAT	Retail Price $	Photo	Add Quantity In Cart
Standard Orifice Assembly # 35 Orifice	35AO	$29.50
Custom Orifice Assembly # 38 Orifice	38AO	$35.00
Custom Orifice Assembly # 41 Orifice	41AO	$35.00
Custom Orifice Assembly # 45 Orifice	45AO	$35.00
Custom Orifice Assembly # 48 Orifice	48AO	$35.00
Custom Orifice Assembly # 51 Orifice	51AO	$35.00
Custom Orifice Assembly # 54 Orifice	54AO	$35.00
Custom Orifice Assembly # 57 Orifice	57AO	$35.00
Custom Orifice Assembly # 60 Orifice	60AO	$35.00
Custom Orifice Assembly # 63 Orifice	63AO	$35.00
Custom Orifice Assembly # 66 Orifice	66AO	$35.00

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Purchase Replaceable Orifice Inserts or KIT
Description	Part # WAT	Retail Price Each $	Photo	Add Quantity In Cart
One # 38 Orifice Insert	38SO	$12.00
One # 41 Orifice Insert	41SO	$12.00
One # 45 Orifice Insert	45SO	$12.00
One # 48 Orifice Insert	48SO	$12.00
One # 51 Orifice Insert	51SO	$12.00
One # 54 Orifice Insert	54SO	$12.00
One # 57 Orifice Insert	57SO	$12.00
One # 60 Orifice Insert	60SO	$12.00
One # 63 Orifice Insert	63SO	$12.00
One # 66 Orifice Insert	66SO	$12.00
Orifice Kit: Includes; One Standard Orifice Assembly (WAT 35AO); Orifice #’s; 38,41,45,48,51,54,57,60,63,66 (Each orifice packaged with a table of flow versus pressure;) Allen Wrench	KITAO	$95.00

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When on pipeline gas supply whether using Orifice Flow Control or Flowmeters, are corrections made for flow variations due to pressure changes. They should be, see details of tests.
Purchase Training Aids	Purchase Wire Feeding Aids
Purchase Flow Rate Limiter	Purchase Gas Saver System

Save over $1000 per year per welder and improve weld starts with Payback measured in weeks!!

* US Patent # 6,610,957; "Welding Shielding Gas Saver Device" August 26, 2003, Patent Pending in other countries. The "Flow Rate Limiter" device is

covered by 2008 US patent #7,462,709. Other site material may be covered under our 2006 US Patents # 7,015,412 or # 7,019,248 .

Questions? Send E-mail TechSupport@NetWelding.com
Last modified: 02/03/10

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