What are Pipe Outlet Fittings?

Olet pipe fittings (also known as Branch Connection Fittings or Outlet Fittings) are fittings that provide an outlet from a larger pipe to a smaller (or comparable size) pipe. The basic pipe onto which the branch association is welded is sometimes referred to as the run or header size estimate. The Branch or Outlet size refers to the pipe to which the branch association or connection provides a channel. Branch associations are available in a wide range of sizes, shapes, bores, and classes, as well as a wide range of stainless steel, chrome-moly, and other amalgam alloys.

What are the Difference Between Flexolet and Weldolet?

Our two branch connection products are the Flexolet and the Weldolet. They perform the same function, which is that they reinforce the strength lost when a hole is cut into the header pipe and connect the header pipe to the branch pipe. The Weldolet has a tapered bore, whereas the Flexolet has a straight-through bore, which accounts for the difference in designs.

Why are Pipe Outlet Fittings Used in Pipelines?

A Pipe Outlet Fittings connects two intersecting pipes. Pipe Outlet Fittings are used to connect a larger-diameter pipe to a smaller-diameter pipe. Branch Connections, as opposed to traditional fittings, take up less area and require only two welds to fit precisely. The funnel-like shape allows for unrestricted system flow. Standard branch connections include 90-degree and 45-degree tees, as well as a Wye Branch fitting.

Different Types of Olet or Outlet Pipe Fittings:

• Brazolet (Brazo Outlet)
• Coupolet (Coupling Outlet)
• Elbolet (Elbow Outlet)
• Flexolet (Flexo Outlet)
• Insert Weldolet (Insert Welding Outlet)
• Latrolet (Lateral Outlet)
• Nipolet (Nipple Outlet)
• Sweepolet (Swept Outlet)
• Threadolet (Threaded Outlet)
• Weldolet (Welding Outlets)
• Threadolet (Threaded Outlet)

Socket Outlet Fittings vs Threaded Pipe Outlet Fittings

A threaded pipe outlet fitting is utilized for low pressure 90-degree pipe branches. In Threaded Outlets, the branch pipe is screwed on them and welded to the run pipe. They are available with pressure classes of 3000# and 6000#.

A socket outlet pipe fittings have a branch attached by a socket inside an Outlet. In lower-pressure systems with smaller pipe diameters, the Branch Connection Weld is also used. They are available in 3000#, 6000#, and 9000# pressure classifications.

Outlet Size Inches for BW/Reducing Stainless Steel Welding Outlet in Pressure Classes 3000, 6000, and 9000 According to ASTM A182

Pipe Outlet Fittings Specification

Stainless Steel Nipple Outlet.

• Standard : ASTM / ASME A/SA 182
• Grade : F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L.

Carbon Steel Nipple Outlet.

• Standard : ASTM A105/A694/ A350 LF3/A350 LF2.
• Grade : F42/46/52/56/60/65/70

Alloy Steel Nipple Outlet.

• Standard : ASTM A182
• Grade : F1/F5/F9/F11/F22/F91

Copper Alloy Nipple Outlet.

• Standard : ASTM / ASME SB 61 / 62 / 151 / 152
• Grade : UNS NO. C 70600 (CU -NI- 90/10), C 71500 (CU -NI- 70/30) C 71640

Elbowlet Size and Dimension

Why Prefer Olets Fittings Over Conventional Branch Connection?

There are several benefits to employing Olets fittings instead of a traditional tee and manufactured junction. I've included a few of them below-

• Olets fittings are more pressure-resistant than fabricated joints, which are not recommended for high-pressure lines.
• The strength of the header is maintained because less material has to be removed from the header or run pipe.
• Because it is self-reinforced, no reinforcing pad is required.
• It is easily installed on the pipe rack.
• In comparison to standard tees, welding is simple.
• The piping system is more flexible because it requires less space.
• The Olet fitting requires only two welds, whereas standard tee numbers require three. This makes the Olet fitting more efficient and cost-effective in terms of installation. Additionally, the reduced number of welds minimizes the risk of potential leaks or weak points in the piping system. 

Specification of Weldolet

Of all the olet fittings, weldolets are the most widely used and are ideal for high-pressure applications. A weldolet, which is available in full size or reduced for a straight piece of pipe, creates a 90° branch connection. Due to its self-enforced construction, it is intended to reduce stress concentrations and provide integral reinforcement. Weldolet ends have beveled kinds; hence, the fitting is referred to as a buttweld.

• END – Bevel end
• Branch Pipe End – Bevel end
• Size Range – 2″ – 24″
• Most commonly size range used in the industry – 2″ – 8″, (economical size range)
• Thickness/Schedule – same as the pipe

What is Sockolet? and its Specifictaion

The branch pipe end of a Sockolet will be the plain end because it has a socket weld end as opposed to a Weldolet's plain end. To create a 90° pipe branch, utilize socks. It is utilized in low-pressure lines and pipes of modest sizes. The branch pipe is welded to the socket with fillets. A sockolet, like a weldolet, needs a welded connection on the pipe header side.

• END – Socket type
• Branch Pipe End – Plain end
• Most commonly size range used in the industry – 1/2″ – 2″, (Safe size range)
• Thickness/Schedule – 3000#, 6000# and 9000# (ratings for socketweld fittings)

What is Thredolet? and its Specifictaion

A threadolet creates the 90° branch and is comparable to a sockolet and weldolet. The key distinction is that the branching pipe or instruments are screwed onto the sockolet fitting, which has a female threaded end. Branching can happen at the same size or at a smaller size. The threadolet end typically conforms to American standards and is of the NPT type (National Pipe Thread). Under ASME B1.20.1 specification, the final preparation is carried out.

• END – Female Threaded
• Branch Pipe End – Male threaded
• Size Range – 1/2″ – 2″
• Thickness/Schedule – 2000#, 3000# and 6000# (ratings for threaded fittings)

What is Sweepolet? Where its use ? and its Specifictaion

A Sweepolet is a branch connection with a low stress escalation factor that is shaped and integrally strengthened. It has a long fatigue life and minimal stresses.

• Where to use – Normally used, if the header is above 24″ NPS and Branch is above 8″ NPS (It is not fixed, it can vary company to company)
• END – Bevel end
• Branch Pipe End – Bevel end
• Size Range – 8″ – 24″ (It is mostly used size range)
• Thickness/Schedule – Same as the pipe/Schedule Number

What is Latrolet? and its Specifictaion

Only Latrolet fittings offer lateral branch connections at 45 degrees instead of the more common 90 degrees. There are multi-end connections available for Latrolets fittings.

• END – Socket Weld, Female Threaded, and Bevel end
• Branch Pipe End – Male Threaded, Plain, and Bevel end
• Size Range – 1/2″ – 2″ NPS (for threaded and socket weld end)
• Size Range – Above 2″ NPS (for threaded and socket weld end)
• Bevel/butt weld fittings can be used below 2″ NPS (for food, pharma, and corrosive fluid)
• Thickness/Schedule – 3000# and 6000# (for socket and threaded end) , and for Bevel end thickness will be same as pipe or system rating

What is Flangolet? and its Specifictaion

Flangolets are fittings used for connecting large-bore headers to flanged end components. Breaker flanges may also be joined using Flangolets if your line requires frequent maintenance.

• END – Flanged end
• Branch component End – Flanged end
• Size Range – 1/2″ – 24″ (Normally available)
• Rating – 150#, 300#, 600#, 900#, 1500#
• Flange End preparation- ASME B16.5

What is Nipolets? and its Specifictaion

Nipolets are fittings used to connect plain-end large-bore header pipes to small-bore threaded-end branches with threaded outlets on one end; they are typically used in valve takeoff systems and high- and low-point venting/drainage systems. Welded directly onto header or run pipe, they feature socket welds or threaded outlets on their branch pipe side for secure attachment.

• END – Female threaded or Socket weld end
• Branch component End – Male threaded or Plain end
• Size Range – 1/2″ – 2″ (preferred size range)
• Rating – 3000#, 6000#

What is Coupolet? and its Specifictaion

Coupolet fittings resemble thread end half couplings, designed for use in fire sprinkler systems and low-pressure plumbing networks.

• END – Female threaded end
• Branch component or fire sprinkler End – Male threaded end
• Size Range – 1/2″ – 2″ (preferred size range)
• Rating – can be use up-to maximum of 300#
• Thickness/Schedule – 2000# 3000# and 6000#

What is Elbolet? and its Specifictaion

An Elbolet fitting is typically utilized on 90-degree long radius elbows with long radius bends (most commonly), short radius elbows (rarely used), or 180-degree returns, and it can even be utilized as drain connections if there is not enough room to use a Weldolet fitting. They come equipped with buttweld, socket weld, or threaded end connections.

• END – Female Threaded, Socket Weld, and Bevel end
• Branch Pipe or Instrument End – Male Threaded, Plain, and Bevel end
• Size Range – 1/2″ – 2″ NPS (for threaded and socket weld end)
• Size Range – Above 2″ NPS (for threaded and socket weld end)
• Thickness/Schedule – 3000# and 6000# (for socket and threaded end),
• Rating for Buttweld end – same as piping system