Looks like you have a many to many relationship. It's true that an order will contain many items of equipment, and a piece of equipment can be within many orders, but for 3NF that presents a problem. Instead what you have to do is build a composite key table. I haven't created the Keys etc for you, but as VERY simple exampe you'd need 3 tables along the lines of:
CREATE TABLE Equipment
(EquipmentID int IDENTITY(1,1),
CREATE TABLE ClientOrder
(OrderID int IDENTITY(1,1),
--Now the composite key table
CREATE TABLE EquipmentOrder
(EquipmentOrderID int IDENTITY(1,1),
/*--You could put a quantity in here if you wanted
--or, otherwise, you insert entries for each item,
--which might be repeated items*/);
This means you end up with a one to many relationship between ClientOrder and EquipmentOrder (A Client Order contains many Equipment Orders) and a one to many for Equipment and EquipmentOrders (A piece of Equipment is in many Equipment Orders).
Hopefully that gets you on the right path.
Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.