Flow Nozzles and Nozzle Meter Tubes Brochure Overview Complete Flow Nozzle Sections Recommended Straight Lengths for Nozzles Flow Nozzle Calculations Tap Placement for Flanged Flow Nozzles Weld-In Flow Nozzle Flanged Flow Nozzle Overview Type "P" (Plain) Type "T" (Tapped) Holding Ring Flow Nozzle Integral Nozzles, Sizes below 4" Throat Tap Flow Nozzles Overview Flow Section Design Flanged Type Typical Calibration Chart
Product Overview DANIEL FLOW NOZZLES PRODUCT BULLETIN 137 q
Flanged, Weld-in and Holding Ring Types Made in Accordance with Latest A.S.M.E. Codes
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Available in 304 Stainless Steel and Other Metals
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Fully Assembled Meter Tubes Available Daniel Laboratory Flow Calibration Available
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DANIEL INDUSTRIES manufactures a full line of precision flow nozzles for a wide range of applications. All Daniel flow nozzles are made in accordance with A.S.M.E. Codes, including A.S.M.E. MFC-3M, ANSI B31, and others. Various type nozzles are available for installation in 4" pipe size and larger. Flanged models (Type "T") can be furnished for line sizes as small as 2". For sizes below 4", in other than flanged models, special-design nozzle flow section assemblies are available (not shown). For most operating conditions, Daniel Industries recommends that flow nozzles be purchased in stainless steel to lessen the effects of corrosion on the highly polished throats. Chrome molybdenum steel flow nozzles are available for use under sustained temperatures as high as 1050ºF. Other types of material are available on request for special applications.
Complete Flow Nozzle Sections COMPLETE FLOW NOZZLE SECTIONS
?Downstream tap locations shown are for Beta ranges of .45 and larger. For low Beta (below .45) nozzles, tap is located 1.5x nozzle bore from upstream face. *NOTE: The pipe for holding ring nozzle flow sections MUST be bored internally to allow nozzle installation. Pipe sections for flanged or weld-in type flow nozzles need not be bored if the pipe is measured and found to be round within the tolerances allowed.
For Recommended Lengths A & B, see chart in document entitled "Recommended Straight Lengths for Nozzles."
Flow Nozzle Calculations FLOW NOZZLE CALCULATIONS
The Daniel Industries Calculation Section, a part of the Engineering Department, is responsible for the fast, accurate calculation of flow nozzle bores. The Section utilizes the latest in electronic computers and published trade standards to compute and verify calculations. The calculations are printed on a reproducible data sheet from which a copy is made and sent to the customer. To ensure prompt calculations, the customer should furnish complete information relative to either gas, liquid or steam flows.
4"
=
.38"
5"-8"
=
.50"
10"-16" 18"
= =
.63" .88"
Flange thickness for Type "T" nozzles is 1.50" for 1/2" and 3/4" taps.
Weld-In Flow Nozzle WELD-IN* FLOW NOZZLE
This type nozzle has a machined tongue around its greatest diameter designed to fit between beveled ends of both an inlet and outlet pipe section. The pipe sections, with the nozzle in place, are firmly clamped and/or tack-welded in alignment before the finish weld is applied. The Daniel weld-in flow nozzle is used where flanges are not applicable such as high temperature and pressure applications in power plant installations, feed water, etc. The weld-in nozzle is available with complete flow nozzle flow sections. Pipe wall taps are also used with this type nozzle. *Sizes below 4" may require a special-design nozzle flow section assembly. See document entitled "Integral Flow Nozzles (Sizes Below 4")" for details.
Integral Nozzles (Sizes Below 4")
In sizes below 4", nozzles can normally be offered as an assembly, including upstream and downstream pipe. These integral units are of all welded construction and can be supplied with socket weld or threaded pressure tap connections (1 set is standard). Pipe ends can be beveled or flanged.
Flanged Flow Nozzle FLANGED* FLOW NOZZLE
This type of flow nozzle has a flange on its upstream face which is installed between pipe flanges to hold the nozzle concentric with the inside of the pipe. The nozzle flange can be furnished in any type of facing (raised, ring-joint, etc.) as specified. *See document entitled "Notes on Tap Placement for Flanged Flow Nozzles" for statements on tap locations. q
Type "P" (Plain) Flanged Flow Nozzle
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Type "T" (Tapped) Flanged Flow Nozzle
Type "P" (Plain) Flanged Flow Nozzle TYPE "P" (PLAIN) FLANGED FLOW NOZZLE
Daniel Type "P" flange flow nozzles are the type most commonly used for insertion between pipe flanges. This type of flow nozzle is designed for pipe wall taps whose locations are determined by Beta ratio and pipe I.D. A shoulder behind the nozzle flange centers the nozzle in the pipeline within required tolerances. The Daniel Type "P" flow nozzle is designed in accordance with A.S.M.E. specifications. (Not available in line size 6" or smaller.)
Type "T" (Tapped) Flanged Flow Nozzle TYPE "T" (TAPPED) FLANGED FLOW NOZZLE
Daniel Type "T" flow nozzles are equipped with the downstream tap in the nozzle flange. This type flow nozzle is basically the same as Type "P" except for the downstream tap location. It is used mostly in small sizes where tap interference may occur such as on or too close to the pipe weld, in the pipe weld, etc. The Type "T" is furnished with a 1/2" NPT connection unless otherwise specified.
Holding Ring Flow Nozzle HOLDING RING* FLOW NOZZLE
This nozzle configuration is another welding type designed for installation in a pipe without flanges. The nozzle is installed with the curved nozzle inlet facing upstream in a section of carefully selected and internally bored pipe. The Daniel Holding Ring flow nozzle eliminates the welding of dissimilar materials because the ring, pins and pipe are of compatible materials. Pipe wall taps are also used with this type nozzle. *The holding ring flow nozzle requires careful consideration for use in sizes below 4" because difficulty may be encountered in welding the thin ring inside a small diameter pipe. For this reason, holding ring type nozzles are not recommended below the 4" size. Special-design nozzle flow section assemblies are available for these sizes.
Throat-Tap Flow Nozzles DANIEL THROAT-TAP FLOW NOZZLES
For the power industry, Daniel Industries manufactures the highly accurate throat-tap flow nozzle. This type is used as the acceptance test flow nozzle for generating plants. The nozzle is furnished in the flanged configuration. Because of the high degree of accuracy necessary, design and manufacturing requirements are quite stringent and the relative cost of the throat-tap flow nozzle is higher than standard nozzles. Daniel offers the flow calibration service at its Houston plant. q
Flange Type Throat-Tap Nozzle
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Flow Section Design for Throat-Tap Nozzles
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Typical Nozzle Calibration Chart
Flange Type Throat-Tap Nozzle FLANGE TYPE THROAT-TAP NOZZLE
The Daniel flange type throat-tap flow nozzle is used when extreme accuracy and repeatability are required. In most cases, this type of nozzle is purchased with a complete flow section and laboratory flow calibrated before delivery. Daniel flange type throat-tap nozzles are manufactured in strict accordance with the A.S.M.E. power test code and furnished with two throat-taps as standard.
Flow Section Design for Throat-Tap Nozzles
Note: No obstruction such as thermocouple wells, backing rings, etc. FLOW SECTION DESIGN FOR THROAT-TAP NOZZLES (A.S.M.E. POWER TEST CODE PTC-6-1964)
Typical Nozzle Calibration Curve
